Mozilla

Are you passionate about Privacy Protections and the Open Web? Do you want to ship software to a large user base? Do you want your contributions to have a positive impact on the world? Do you want to advance current browser architecture to make the web a safer place for users? Mozilla exists to build the Internet as a public resource accessible to all because we believe that open and free is better than closed and restricted. We are looking for a Senior Software Engineer to support the Privacy Team to advance the Firefox Web Platform. As a Senior Software Engineer in the Privacy Team at Mozilla, you will… - Implement Privacy-improving, anti-tracking features and data sanitization into the Firefox web browser to prevent all forms of unhealthy user tracking. - Implement architectural improvements into Gecko, the browser engine underlying Firefox. - Build performant, low-latency, and maintainable C++, JavaScript and Rust code - Work as part of a geographically distributed team in an asynchronous manner (mostly Europe and US-East). Your Professional Profile: - Bachelor's degree in computer science, engineering, or a related program; or equivalent work experience. - At least 4 years of experience with programming in C++ and Rust, with a strong background in memory safety, multi-threaded system architecture, or raw data stream manipulation - Proven ability to onboard quickly, deliver and improve complex software projects. - Proven track record of independently scoping and landing complex features within tight release windows. - Excellent written and verbal communication skills. You can validate your progress and decisions and communicate them clearly. Bonus Points: - You have already contributed to the Mozilla mission and the codebase. - Experience working within the browser space (Gecko, Chromium, WebKit) or web engine runtime abstractions. - Experience or high interest in designing or leveraging ML pipelines to automate internal developer workflows. - Deep understanding of web architecture, the privacy/security model of the web, and client-side data structures. - Knowledge of basic statistical modeling. - Proficiency with Python an

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. The Opportunity We’re looking for an Integrated Marketing Manager for the UK to build and lead our regional marketing strategy. You’ll operate at the intersection of global strategy and local execution—bringing deep UK insight into a globally coordinated marketing organization. Europe is at the center of a once-in-a-decade shift in how browsers compete. This role is about turning that shift into relevance and sustained growth—and helping millions of people choose a better internet. We are looking for someone who can integrate the brand into sports, music, and local communities to ensure Firefox remains a prominent and valued choice for consumers. At the same time, this role plays an important part in building and leading our UK marketing strategy and executions, driving broader brand relevance, consideration, and user growth across the UK market. This is a critical marketing role focused on: - Re-establishing Firefox as a relevant, differentiated brand - Driving relevance and market share growth - Leading major campaigns and partnerships and activations in the UK Key Responsibilities Partner with the Director European Integrated Marketing to shape and deliver integrated marketing strategies and storytelling for the UK, build cultural relevance, and represent the brand, using audience insights and product feature priorities as an anchor. Build Cultural Relevance - Help make Mozilla part of the conversation across sports, music, creator, music, and internet culture in the UK. -

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. The Opportunity We’re looking for an Integrated Marketing Consultant for France to build and lead our 2026 French brand campaign. You’ll operate at the intersection of global strategy and local execution—bringing deep French insight into a globally coordinated marketing organization. Europe is at the center of a once-in-a-decade shift in how browsers compete. This role is driving a major brand campaign in 2026 to drive relevance and growth—and helping millions of people choose a better internet. You’ll drive Mozilla’s cultural relevance in France for this campaign by identifying and activating opportunities beyond the tech category, embedding the brand in moments, communities, and conversations that keep the brand top-of-mind and meaningfully considered. This is a critical marketing role focused: - Re-establishing Firefox as a relevant, differentiated brand - Driving user and market share growth in France - Leading a major campaign and activation in France Key Responsibilities You’ll be developing and leading a specific French marketing/brand strategy and campaign in 2026. This is a temporary 6-month role focused on 2026 campaign development. You’ll partner with the Director European Integrated Marketing to shape and deliver integrated marketing campaign strategy for France, aligned to audience insights, brand priorities, product initiatives, and cultural moments. Planning & Strategy - Develop strong thought leadership and understanding of the regional landscape in France, including consumer needs, competitive specs, and emerging macro + cultural trends&l

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security, and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build, and distribute open-source software that enables people to enjoy the internet on their terms. Mozilla Finance is the engine behind our mission. We balance strategic resource allocation with seamless day-to-day operations to fuel Mozilla’s growth. As we look to the future, our Strategic Finance & Corporate Development team ensures we are positioned to capitalize on industry shifts, manage our capital sustainably, and evaluate ecosystem opportunities that align with a better, more ethical internet for everyone. About this Team and Role: We are seeking a Director of Strategic Finance & Direct Investments to join our Finance leadership team. This is a high-impact, visionary leadership role reporting directly to the VP of Finance . In this capacity, you will serve as a key architect of Mozilla’s long-term financial future. You will sit at the intersection of corporate strategy, strategic partnerships, and forward-looking financial planning. You will lead a small, elite team of finance professionals tasked with translating Mozilla’s long-term vision into rigorous financial models, evaluating market sizes, monitoring our investment portfolio, and collaborating across our subsidiaries to track broader industry shifts. The ideal candidate is a seasoned financial leader who possesses a blend of deep macroeconomic insight, advanced strategic framing capabilities, and a proven track record of guiding "build vs. partner" decisions alongside senior executives. What You’ll Do: - Long-Range Strategic Modeling: Own and evolve Mozilla’s 3-to-5-year long-range financial model, translating high-level strategic goals and company vision into actionable financial forecasts. - Market Architecture (TAM/SAM/SOM): Conduct rigorous market sizing and segmentation analyses. Define, track, and evaluate our Total Addressable Market (TAM), Serviceable Addressable Market (SAM), and Serviceable Obtainable Market (SOM) for both existing products and emerging business lines. - Investment Portfolio Monitoring: Over

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. The Team: The Brand & Creative team, situated within Mozilla Marketing, comprises passionate, remote-based producers, designers, writers, and brand strategists. The focus of this role will be Firefox marketing — shaping how people understand and experience the Firefox brand globally through performance-driven campaigns, creative storytelling, and full-funnel marketing work. We partner closely with cross-functional stakeholders — including Product Marketing, Comms, Data & Insights, and regional Activation teams — to develop cohesive brand campaigns that bring Firefox’s mission to life. This role collaborates on projects across Mozilla’s broader product portfolio, but Firefox remains our primary focus. We help define the brand’s strategic foundation and translate it into dynamic creative expressions that perform across platforms and markets, whether via upper-funnel brand campaigns, mid-funnel content, or lower-funnel performance work. Overview of the Role: We’re looking for an experienced Creative Producer to lead the production and execution of Firefox marketing campaigns. This role spans creative operations, end-to-end campaign production, and project management, with a strong emphasis on coordinating with external agencies and contractors. You’ll coordinate with our agency of record (AOR) on ongoing drumbeat work, while also running RFPs and overseeing the execution of larger, integrated brand campaigns. You’ll manage timelines, budgets, feedback cycles, and drive process excellence across every stage of production — from scope to launch. The ideal candidate is self-directed, strategically minded, and comfortable managing complexity — whether that’s navigating cross-functional relationships, facilitating global-to-regional rollouts, or balancing multiple creative workstreams. You’ll sit within a brand and creative team that champions Mozilla’s values while ensuring Firefox shows up in market with clarity, consistency, and creative ambition. What you'll do: - Lead the production of full-funnel Firefox mark

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About this role: Mozilla’s Cloud Engineering team seeks a Senior Software Engineer to mature, maintain, and build features for our Internal Developer Infrastructure Platform. You will work on creating standardized, scalable systems for CI/CD, Observability, Kubernetes optimization, environment bootstrapping, cost optimization, and more. Supporting the Infrastructure needs of the organization and identifying new opportunities to mature the path to production in a safe, cost effective way will also be an integral part of this role. What you’ll do: - Support infrastructure that development teams use to own and operate their services at Mozilla. - Guide technical decision-making and adoption of user-centric solutions. - Create Claude skills and design agentic workflows that improve developer productivity - Guide team members and promote engineering standard methodologies, with a focus on usability and maintainability. - Facilitate cross-functional collaboration for efficient and cohesive platform delivery. - Write proposals and decision briefs for new policies, processes, and platform functionality. - Create new features for the platform with a meaningful value proposition - Be trusted to resolve unclear but urgent tasks. What you’ll bring: - 5+ years experience in software engineering with expertise in at least one of (Platform Engineering, Cloud Engineering, SRE, DevOps) - Proven technical leadership experience. <li style="font-weight:

Why Thunderbird? Thunderbird is one of the world’s most trusted open-source email applications, empowering more than 20 million people globally. At MZLA, the team behind Thunderbird, we build privacy-respecting communication and productivity tools that help people manage their digital lives while staying in control of their data. We are open source by design. Our products are developed transparently and in collaboration with a global community of contributors, and that same spirit shapes how we work: collaboratively, inclusively, and with a shared commitment to putting users first. We are a small but growing company of 60+ people distributed across seven countries. As Thunderbird evolves beyond a single desktop application, we are expanding across desktop, mobile, paid services, and new product experiences that help people and organizations work more effectively without giving up control to big tech ecosystems. Our revenue model combines user donations, which help keep Thunderbird’s apps freely available, with paid services that cover the costs of hosted offerings while supporting long-term sustainability and continued innovation. A note about MZLA and Mozilla: MZLA Technologies Corporation is the nonprofit-owned company behind Thunderbird and part of the Mozilla family. MZLA is separate from Mozilla Corporation and has its own compensation programs, benefits, and employment policies. To learn more, visit www.thunderbird.net and www.thunderbolt.io. The opportunity Thunderbolt is an open-source, cross-platform AI product initiative from the team behind Thunderbird. It is being built around a clear principle: people and organizations should be able to use AI while staying in control of their data, infrastructure, model choices, and long-term options. Thunderbolt is designed to support flexible deployment models, integrations with AI tools and workflows, and use cases across desktop, web, and mobile. We are looking for a Senior Engineering Manager to lead engineering execution, people management, and operating practices for Thunderbolt as it moves from R&D incubation into a more mature product and enterprise development phase . This role will help the team define what production-ready means at this stage: stronger release discipline, clearer ownership, higher user-facing product quality, stronger engineering practices, and a more scalable operating model. This is a hands-on technical management role . The Senior Engineering Manager will manage a senior engineering team, stay closely engaged with the codebase and technical execution , coordinate work across employees, contractors, and technical partners, and help the team deliver a reliable, enterprise-ready open-source AI product. The right person will bring strong people management skill

To learn the Hiring Ranges for this position, please select your location from the Apply Now dropdown menu. To learn more about our Hiring Range System, please click this link. Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About this team and role: The New Products organization is an innovation and entrepreneurial organization focused on launching new products and new businesses for Mozilla. We are looking for a Director of Product Management with the strategy and execution skills to build businesses from the ground up. This role sits at the intersection of gaming and the open web — you'll be defining how Mozilla enters a new market and building the business model, go-to-market strategy, and product from the ground up. What you’ll do: - Develop a deep understanding of the PC gaming market - including ecosystems, distribution models, audience segmentation, and monetization patterns - Lead the vision and strategy for a new product area, ensuring development of a high quality product with strong alignment to Mozilla’s strengths and customer value. - Manage a team of design and engineering resources to create an enjoyable and user-centric product that can meet or exceed business goals - Able to seamlessly navigate between high level strategic planning and practical implementation, translating the strategy into the roadmap and action plans for the teams - Clear and articulate communication of product plans, customer value, trade-offs, and outcomes to a wide array of audiences including cross-functional partners, Mozilla Leadership, employees, and customers - Be a thought leader in the gaming space, wit

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About this team and role: Firefox Enterprise is a new team within Mozilla that is addressing the needs of business and government customers for a secure enterprise browser that gives organizations greater control over their data, policies, and digital infrastructure. We’re now seeking a Senior Strategic Account Executive, Firefox Enterprise to help grow Firefox Enterprise in France . This is a high-impact enterprise sales role for someone who is excited to build a pipeline, open new conversations, and close the first wave of meaningful commercial wins in the region. What you’ll do: - Build the pipeline across France and Belgium by developing new opportunities with large enterprises, regulated organizations, and public-sector-related accounts. - Own the full sales cycle from prospecting and qualification through discovery, evaluation, business case development, negotiation, and close. - Turn early customer interest into pilots, support agreements, and long-term enterprise opportunities. - Partner closely with the Business Development Lead on market priorities, executive engagement, and the region’s most important opportunities. - Work with Solutions Engineering to support technical discovery, customer validation, pilot execution, and rollout planning. - Build trusted relationships with senior stakeholders across IT, security, architecture, procurement, and compliance, while helping refine the regional sales motion based on market feedback. What you’ll bring: - Significant experience in enterprise SaaS, infrastructure, security, or platform sales. <li style="font-weight:

To learn the Hiring Ranges for this position, please select your location from the Apply Now dropdown menu. To learn more about our Hiring Range System, please click this link. Why Mozilla Mozilla Corporation is a non-profit-backed technology company that has helped shape the internet for the better over the past 25 years. We’re the makers of Firefox , the privacy-focused web browser used by more than 225 million people around the world each month. As we look to the future, we’re working to shape the next 25 years of the internet—one that’s built for people, not just for profit. Mozilla Corporation is wholly owned by the 501(c) non-profit Mozilla Foundation , meaning we’re accountable not to shareholders, but to our mission. Alongside thousands of contributors and collaborators around the world, Mozillians design, build, and maintain open-source software that empowers people to use the internet on their own terms. About this team and role: Firefox Enterprise is a new team within Mozilla that is addressing the needs of business and government customers for a secure enterprise browser that gives organizations greater control over their data, policies, and digital infrastructure. We’re now seeking a Senior Strategic Account Executive, Firefox Enterprise (DACH) to help grow Firefox Enterprise across Germany, Austria, and Switzerland. This is a high-impact enterprise sales role for someone who is excited to build pipeline, open new conversations, and close the first wave of meaningful commercial wins in the region. What you’ll do: - Build the pipeline across DACH by developing new opportunities with large enterprises, regulated organizations, and public-sector-related accounts. - Own the full sales cycle from prospecting and qualification through discovery, evaluation, business case development, negotiation, and close. - Turn early customer interest into pilots, support agreements, and long-term enterprise opportunities. - Partner closely with the Business Development Lead on market priorities, executive engagement, and the region’s most important opportunities. - Work with Solutions Engineering to support technical discovery, customer validation, pilot execution, and rollout planning. - Build trusted relationships with senior stakeholders across IT, security, architecture, procurement, and compliance, while helping refine the regional sales motion based on market feedback. </ul&g

Why Thunderbird? Thunderbird is one of the world’s most trusted open-source email applications, empowering more than 20 million people globally. At MZLA, the team behind Thunderbird, we build privacy-respecting communication and productivity tools that help people manage their digital lives while staying in control of their data. We are open source by design. Our products are developed transparently and in collaboration with a global community of contributors, and that same spirit shapes how we work: collaboratively, inclusively, and with a shared commitment to putting users first. We are a small but growing company of 60+ people distributed across seven countries. As Thunderbird evolves beyond a single desktop application, we are expanding across desktop, mobile, paid services, and new product experiences that help people and organizations work more effectively without giving up control to big tech ecosystems. Our revenue model combines user donations, which help keep Thunderbird’s apps freely available, with paid services that cover the costs of hosted offerings while supporting long-term sustainability and continued innovation. A note about MZLA and Mozilla: MZLA Technologies Corporation is the nonprofit-owned company behind Thunderbird and part of the Mozilla family. MZLA is separate from Mozilla Corporation and has its own compensation programs, benefits, and employment policies. To learn more, visit www.thunderbird.net The opportunity Thunderbird is growing beyond our free desktop and mobile applications, and we’re looking for a Senior Manager, Web Applications to lead day-to-day engineering execution and people management for the team responsible for MZLA’s hosted subscription products. This is a critical product and revenue area for MZLA. The Senior Manager will help the team launch, maintain, and improve hosted services with strong delivery discipline, clear ownership, reliable engineering practices, and a continued focus on quality, privacy, reliability, and user trust. This is a small, growing team, and the right person will be a hands-on technical manager who wants to stay close to the codebase, product direction, service reliability needs, release readiness, and engineering tradeoffs while also leading people and improving how the team operates. As the Web Applications team continues to mature, this role will require an engaged manager who can help create structure, solve problems, support execution, and build stronger systems around the work. This role requires consistent overlap with EST time zone working hours, and we strongly prefer candidates located in or closely aligned with this time zone. What you’ll do - Lead day-to-day engineering execution in a hands-on management capacity, ensuring priorities, ownership, timelines, risks, dependencies, and quality expectations are clear. - Manage Web Services engineers and contr

To learn the Hiring Ranges for this position, please select your location from the Apply Now dropdown menu. To learn more about our Hiring Range System, please click this link. Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About this team and role: We are seeking a strategic, pragmatic, and proactive Privacy Counsel to join our privacy legal team! This role will focus primarily on building, operationalizing, and maintaining Mozilla’s core privacy compliance infrastructure and scalable privacy governance processes across our global organization. Working remotely, you will serve as frontline privacy counsel for internal privacy matters, advising teams across Mozilla on operational privacy risks, enterprise data governance, third-party risk management, and incident response. You will partner closely with legal, security, IT, engineering, procurement, people, trust and safety, and other cross-functional stakeholders to help operationalize privacy-by-design principles across Mozilla’s internal systems and enterprise processes, and develop our privacy compliance and risk-management strategy. This is a highly collaborative and execution-oriented role for someone who thrives in ambiguity, takes ownership of complex initiatives, and can independently drive programs from strategy through implementation. We’re a small legal team, so this role requires someone who is both a leader and a “doer” - someone with deep expertise but who isn’t above rolling up their sleeves to take on tasks necessary to help make sure the job gets done. The ideal candidate combines strong substantive privacy expertise with experience building durable compliance infrastructure and managing enterprise privacy operations in a fast-moving technology environment. What you'll do: - Lead the development, implementation, and ongoing maintenance of Mozilla’s core privacy compliance infrastructure, including enterprise data mapping and records of processing activities. - <span style="font-weight

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. About this team and role: The Firefox Application Security Team sits at the center of Firefox, collaborating with the whole organization through fundamental security projects that range from architecture hardening , and security research to web security . Our team applies foundational platform improvements as well as automation to scale our work such that it serves all of Firefox and hundreds of millions users worldwide. What you’ll do: - Learn how our team secures the web and help improve the browsing experience for everyone on the web - Get support from your manager and your assigned mentor - Learn and partake in regular team processes that help secure a mature product - Help investigate security issues with guidance and write test cases using HTML and JavaScript - Improve existing team processes using Python or expand web security features in Firefox using C++ - Get the chance to learn how to work with the wider open source community - Optionally, propose and drive your own projects What you’ll bring - You are enrolled in a university in Germany and are willing to occasionally visit our office in Berlin a few times per year - You do not need prior security experience, but you should bring either web development, Python, or systems programming experience, and enjoy careful technical investigation. - You are comfortable communicating in English in writing and during meetings</span&g

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About this team and role: addons.mozilla.org (AMO) is the foundation of the Firefox add-ons ecosystem. It’s a showcase for developers to publish and grow their extensions, and a place of discovery for millions of users who customize Firefox to make it their own. Behind the scenes are the DevHub which enables developers to manage their extensions. To manage the ecosystem there are a series of Reviewer tools and automated moderation systems. As a Senior Software Engineer - Operations, you’ll bring a passion for crafting resilient systems that accelerate our review and operations team to provide a first-class experience for Add-on developers. You’ll work closely with engineers, reviewers, developer relations, and Add-ons leadership to turn ideas into polished features, modernize the platform and its architecture, and see your work reach millions of people around the world. What you’ll do: - Deliver major features and architectural improvements across the Add-ons stack, including automated moderation pipelines, Reviewer tools, and DevHub. - Create robust observability systems and data-backed insights. - Provide peer feedback, share knowledge and help others grow. - Improve platform reliability through deployments, monitoring, and incident response. - Help keep the platform safe and trustworthy, with attention to security and user trust. - Step in to resolve issues impacting users and developers, from small bugs to larger incidents. - Collaborate with designers, product managers, QA, and community contributors to deliver end-to-end improvements. - Contribute in the open through pull requests, code reviews, and discussions. - <span style="

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security, and more. And we’re doing this without losing focus on our core mission - to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders - only to our mission. Along with thousands of volunteer contributors and collaborators worldwide, Mozillians design, build, and distribute open-source software that enables people to enjoy the internet on their terms. About this team and role: A Staff Operations Engineer leads the design, reliability, and evolution of hybrid-cloud and workplace infrastructure. This senior role spans teams, drives complex initiatives, sets technical direction, and ensures systems are scalable, secure, and efficient. This role combines technical execution with leadership , shaping architecture both directly and collaboratively. What you’ll do: Domain Architecture & Technical Direction - Own and evolve architecture within a defined infrastructure domain - Design and implement scalable, reliable systems spanning multiple teams or environments - Establish and promote best practices, patterns, and standards within the domain - Contribute to medium- and long-term technical strategy (typically 6-18 months) Complex Problem Solving & Execution - Lead delivery of ambiguous, high-impact infrastructure projects - Break down elaborate system problems into implementable solutions - Drive migrations, re-architectures, and performance/reliability improvements - Remain hands-on with critical systems and implementations Cross-Team Collaboration - Work across teams (IT, SRE, Security, Service Owners) to unify solutions. - Influence technical decisions through design reviews and collaboration - <span style="font

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. What you’ll do: - Advance Firefox's security architecture and cryptography stack: Contribute to improvements in Firefox's core security systems, with a focus on cryptographic protocols, WebPKI, and security-sensitive web APIs. Help implement and maintain security features that support the evolution of public key infrastructure on the web. - Design and implement web platform security features: Develop and ship web platform features in collaboration with teammates and the broader web community. Contribute to standards-based, secure, and interoperable implementations across Firefox. - Improve browser reliability, performance, and resource efficiency: Investigate and resolve issues impacting stability, correctness, and performance. Analyze and improve memory usage and efficiency within a complex, multi-threaded browser environment. - Collaborate on security initiatives: Partner with engineers across teams to identify, prioritize, and address security issues. Participate in debugging, root cause analysis, and implementation of effective long-term solutions. - Contribute to technical design and planning: Participate in technical discussions, design reviews, and project planning for security-related initiatives. Help evaluate tradeoffs and contribute to engineering decisions within your area of work. What you’ll bring: - Strong software engineering and security fundamentals: Experience in software engineering, with proficiency in C/C++ and a solid understanding of security principles, including cryptographic protocols and implementations. - Experience building and maintaining complex software systems: Ability to contribute to the design, implementation, testing, and maintenance of software in large-scale or security-sensitive environments.</s

Summary Mozilla is building a position in open source AI through research, community, tooling, and public advocacy. A big part of that work is showing, not just telling. We need an engineer who ships fast and in public — working code and real demos that developers can install, fork, and build on. The current focus is Harbor , a Firefox and Chrome extension implementing a proposed Web Agent API that puts model choice, tool permissions, and agent oversight back in the hands of the user and the browser, rather than the vendor. Harbor is three layers: the browser extension at the bottom managing permissions, model access, and revocation; the SDK/API layer on top exposing primitives like window.ai , window.agent , and WebMCP tools; and the application and workflow layer at the top — the actual experiences being built. The thesis is that agents should only be able to do what a page explicitly declares, not free-roam the DOM. Making those layer boundaries legible is core to the role — if a developer or their coding assistant keeps reaching for the wrong primitive, that's yours to fix. If you've shipped a browser extension, authored MCP servers, run models locally with Ollama or llama.cpp, and thought seriously about prompt injection as an architectural problem rather than a prompt-level concern, this is the specific intersection we're hiring for. Beyond Harbor, Mozilla is building across a broader sovereignty stack — open identity, privacy-preserving verification, and other surfaces where the same thesis applies: users should own the layer, not the platform. The right person will find adjacent prototyping work as that develops, and will be energized by the problem space broadly enough to move fluidly across it. What you'll do - Ship working tools, demos, and reference implementations on top of Harbor and open source AI tooling — fast. Days, not weeks. Code that makes architectural choices concrete enough for another developer to install, read, fork, and build on. - Make the layer architecture legible — reference implementations clean enough to read, documentation that maps the repo structure and clarifies the relationship between Web Agents API and Harbor SDK. If a developer or their coding assistant keeps reaching for the wrong primitive, that's yours to fix. - Be the technical practitioner in the room when it matters — a WICG call, a hackathon, a GitHub thread where a hard architecture question comes up. A community manager handles distribution and presence; your job is to show up with working code and real opinions when the conversation turns technical, and come back with a clear read on what developers are missing or getting wrong. -

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About this team and role: The WebExtensions platform powers the add-ons ecosystem in Firefox, enabling millions of users to customize their browser while keeping safety and performance at the forefront. As a WebExtensions Engineer, you will help implement new extension capabilities, improve existing APIs, and ensure that extensions remain reliable across Firefox. As a Software Engineer on the WebExtensions team, you’ll bring a passion for exploring complex systems and creating experiences that balance developer power with user trust. You’ll work deep in the Gecko platform to evolve extension capabilities, and you’ll build UI features in Firefox that make extensions clear and manageable for users. Along the way, you’ll collaborate with experts across Mozilla and help advance cross-browser compatibility and the path toward standardization. Your work will keep extensions safe, powerful, and reliable for developers and millions of Firefox users. What you’ll do: - Implement and maintain WebExtensions APIs and Addon Management, balancing power, safety, and performance, as well as user interfaces in Firefox. - Debug and fix issues affecting extensions in Firefox. - Collaborate with product managers, QA, and the AMO engineering team to deliver features end-to-end. - Contribute to Mozilla-owned extensions and system add-ons. - Participate in open source workflows: code reviews, pull requests, and discussions in Bugzilla/GitHub. - Support extension developers by helping diagnose issues and improving tooling/documentation. Wh

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company behind pioneering brands like Firefox, the privacy-minded web browser, and Pocket, the content discovery platform. More than 270 million people around the world use its products each month. Along with 20,000+ volunteer contributors and collaborators all over the world, Mozilla Corporation’s staff are driven by our vision to be the trusted guide through a joyful internet. We design, build and distribute software that enables people to enjoy the internet on their terms. Motivation: - Are you passionate about Firefox and the open Web? - Do you want your contributions to have a positive impact on the world? - Do you want the Web to be more secure by bringing state of the art web privacy features to everyone? Your Professional Profile - Currently enrolled in a Bachelor’s, Master’s, or Ph.D. degree program in Computer Science, Computer Engineering, or related technical field focusing on security, privacy, or software development - Strong communication skills and proficiency in English - Enthusiasm for conducting software engineering work in the open - Basic knowledge of core web technologies and how browsers work at a high level - An understanding of, and passion for, privacy and security on the web - Experience with programming in C/C++ or JavaScript - Drive for learning and delivering fundamental work across the entire stack Examples of projects and responsibilities - Automating, triaging, diagnosing and fixing web compatibility issues caused by Firefox's Enhanced Tracking Protection - Owning, delivering, prototyping or improving smaller-scale privacy-improving projects such as Copy Clean Link - Working to improve Protections UI, Site Identity, Site Permissions and Certificate Errors surfaces across Firefox - Consolidating and improving telemetry dashboards - <span style="font-weight:

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make groundbreaking brands like Firefox, the privacy-minded web browser. Now, with more than 200 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, privacy, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About this team and role: The Firefox Data Science team partners with Product and Engineering to grow usage of our flagship product: Firefox , the privacy-minded web browser. Our work informs prioritization, investment decisions, and the long-term growth strategy across Firefox. This Staff Data Scientist will own the analytical strategy for a major product area: identifying the right questions, defining how success is measured, and driving decisions that shape Firefox’s growth trajectory. You will be a strategic partner to product and engineering leadership: framing problems, designing measurement approaches, and translating data into clear recommendations that influence roadmap and resource allocation. You will also raise the analytical bar across the team by establishing frameworks, mentoring other data scientists, and setting standards for how we measure and learn. This role requires the judgment to know which problems matter most, the technical depth to solve them rigorously, and the influence to ensure the work drives action. What you’ll do: - Own the analytical strategy for a product area: identifying the highest-leverage questions, defining the measurement framework, and ensuring data-driven decisions - Serve as a strategic partner to product and engineering leadership, translating ambiguous business problems into analytical approaches and clear, actionable recommendations - Define north-star metrics and measurement strategies to set goals, evaluate progress, and make trade-offs - Design and oversee experiments and causal analyses, ensuring methodological rigor and that results drive real product decisions - Develop and maintain a deep understanding of user growth dynamics: how acquisition, activation, and retention interact to drive growth, and use that understanding to diagnose metric movements, explain trends to leadership, and anticipate emerging risks or opportunities - <span styl

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser, and Pocket, a service for keeping up with the best content online. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About the Team & Role The Firefox team is building the next generation of intelligent, privacy-aware experiences for the web. As part of this evolution, we are embedding modern AI and LLM-driven features directly into the browser—empowering users while safeguarding their autonomy and data. We’re looking for a Senior Machine Learning Engineer with a strong focus on applied AI and modern LLM-based applications . You will help conceptualize, prototype, and deploy user-facing experiences grounded in Generative AI , working collaboratively with engineering, design, and product to bring these capabilities to life in Firefox. What You’ll Do - Develop and fine-tune large language models (LLMs) for intelligent, safe, and responsive browser interactions. - Apply retrieval-augmented generation (RAG), summarization, classification, and intent modeling techniques in real-world browser workflows. - Use modern ML tooling (e.g., Hugging Face, LangChain, Weights & Biases, Ray, or similar) to support end-to-end model development , including experimentation, evaluation, and rollout. - Collaborate closely with product and engineering partners to design, iterate, and launch features that align with user needs and Mozilla’s values. - Design and implement experiments to test model behavior in production, analyze results, and iterate based on findings. &lt

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. Shape a Better Internet with Mozilla. Mozilla is seeking a Senior Content Creator based in Germany to produce standout social content for our German Firefox channels. You'll be responsible for the full content life cycle. This covers conceptualising, scripting, filming, and editing both trending and evergreen short-form videos. You will translate top-performing content from other markets. You will also manage the community on @firefox_de across TikTok, Instagram, and Threads. Connecting with German creators to add authentic new voices to the Firefox story is another key task. As a member of Mozilla's content team, you'll bring a high level of craft and creative judgment to everything you make. You'll work with significant creative autonomy, producing content that connects Firefox to German culture — adapting quickly, staying sharp, and consistently setting the standard for what great looks like in this market. About You You're a storyteller and fluent German speaker with a sharp instinct for what makes content perform. You are dedicated to the German digital landscape, with knowledge of the creators, platforms, memes, and moments that matter. You're "extremely online," move fast without sacrificing quality, and thrive at the intersection of content, community, and culture. You're a skilled, self-sufficient creator who can take a brief and run with it. You bring strong creative judgment and executional excellence from concept through final cut. You know how to connect product moments to cultural moments, how to build authentic communities, and how to partner with the right voices to make content that genuinely resonates. What You'll Do Content Production - Ideate, script, film, and edit high-performing short-form video content for TikTok, Instagram Reels, and Threads, spanning both trending moments and evergreen editorial priorities - Translate and adapt global content for the German mar

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About this team and role: Mozilla’s mission is to champion the internet as a global public resource, measured through a double bottom line : advancing that mission while succeeding in the market. At Mozilla Corporation, this means building and scaling trusted, user-first products , like Firefox , that give people meaningful control over their online experience, while supporting a more open, competitive, and sustainable tech ecosystem. The global public policy team enables this by shaping laws and regulatory frameworks that support our open source technologies, strengthen user choice and privacy, and ensure fair competition to create the conditions for responsible innovation and long-term growth.Do you like working on big-picture problems? Join us to influence the future of tech policy! In this role, you will engage with government stakeholders, industry partners, and civil society, advocating for public policy positions that align with our mission and support responsible innovation in technology. You will be responsible for raising the profile of Mozilla and Firefox in the UK, ensuring consistent engagement with our stakeholders, and coordinating input from subject matter experts on the global policy team. As such, you will lead end-to-end policy campaign development and execution across key issues such as privacy, competition, and AI in the UK, while contributing to and supporting related efforts at EU level. You will also collaborate with our internal product and engineering teams to provide expert advice on public policy implications related to the rollout of new products. This role reports to the Head of Public Policy EU. This is a high-impact role for someone who understands both the technical landscape and the policymaking process—and who wants to help build a better internet. What you'll do:</stron

To learn the Hiring Ranges for this position, please select your location from the Apply Now dropdown menu. To learn more about our Hiring Range System, please click this link. Why Mozilla? Mozilla Corporation is a non-profit-backed technology company that has helped shape the internet for the better over the past 25 years. We’re the makers of Firefox , the privacy-focused web browser used by more than 225 million people around the world each month. As we look to the future, we’re working to shape the next 25 years of the internet—one that’s built for people, not just for profit. Mozilla Corporation is wholly owned by the 501(c) non-profit Mozilla Foundation , meaning we’re accountable not to shareholders, but to our mission. Alongside thousands of contributors and collaborators around the world, Mozillians design, build, and maintain open-source software that empowers people to use the internet on their own terms. About this team and role: We’re now seeking a Staff Solutions Engineer (France) to support the growth of Firefox Enterprise across France. This is a highly customer-facing technical role focused on helping enterprises evaluate, validate, and deploy Firefox Enterprise in secure, complex, and regulated environments. The ideal candidate brings deep technical credibility, strong enterprise architecture experience, and a passion for helping customers solve real-world security, deployment, and interoperability challenges. What you'll do: - Partner with Sales to support strategic enterprise opportunities. - Lead technical discovery and solution design with customers and partners. - Run workshops with customer stakeholders across security, infrastructure, IAM, endpoint management, and workplace technology. - Own the relationship to the customer’s technical counterparts during and after the sales process. - Help customers evaluate Firefox Enterprise in areas such as deployment, policy management, identity integration, logging, security controls, and operational fit. - Design and support pilots, proofs of concept, and rollout plans. - Advise customers on deployment models, architecture decisions, and integration approaches for enterprise environments. <li style="font-weight:

To learn the Hiring Ranges for this position, please select your location from the Apply Now dropdown menu. To learn more about our Hiring Range System, please click this link. Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About this team and role: We’re now seeking a Senior Solutions Engineer (DACH) to support the growth of Firefox Enterprise across Germany, Austria, and Switzerland. This is a highly customer-facing technical role focused on helping enterprises evaluate, validate, and deploy Firefox Enterprise in secure, complex, and regulated environments. The ideal candidate brings deep technical credibility, strong enterprise architecture experience, and a passion for helping customers solve real-world security, deployment, and interoperability challenges. What you’ll do: - Partner with Sales to support strategic enterprise opportunities across DACH. - Lead technical discovery and solution design with customers and partners. - Run workshops with customer stakeholders across security, infrastructure, IAM, endpoint management, and workplace technology. - Own the relationship to the customer’s technical counterparts during and after the sales process. - Help customers evaluate Firefox Enterprise in areas such as deployment, policy management, identity integration, logging, security controls, and operational fit. - Design and support pilots, proofs of concept, and rollout plans. - Advise customers on deployment models, architecture decisions, an

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About this team and role: Firefox developers land code every day to delight users with new features and improve product performance and security. Every day, developers and managers use our team’s applications to develop, build, test, and deliver Mozilla’s core products. We are force-multipliers to enable Firefox developers to do their best work. What you’ll do: - Improve Firefox development workflows to reduce time spent testing and debugging test failures as well as more integration/automation of workflows - Work with a geographically-distributed development team - Mentor other team members and be mentored by more senior team members - Collaborate with other teams by providing code review and technical direction - Look at data, make dashboards, identify trends in Firefox development workflow What you’ll bring: - Proven Python skills, including building services - Front-end development experience, including JavaScript proficiency - Experience with Python frameworks (e.g., FastAPI, Flask, Django), Cloud Services (e.g., GCP, AWS) and REST - Solid understanding of databases and SQL - Experience with CI/CD systems (e.g., GitHub Actions, CircleCI) and test harnesses - Comfortable working cross-platform, familiar with at least 2 of: Windows, Linux, Mac, Android - A passion

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About this team and role: The Marketing Data Science team sits within the broader Product Data Science organization and provides comprehensive analytical support and thought partnership to Marketing to guide responsible and effective investment decisions. Our work centers on end-to-end measurement solutions that seek to quantify the true return of our marketing efforts—touching measurement instrumentation, data modeling, experiment design, execution, and the translation of insights into actionable recommendations. Beyond measurement, we support KPI forecasting, budget allocation, self-service reporting, and a wide range of advanced statistical modeling solutions. As a Senior Data Scientist, you will take a hands-on role in answering complex marketing questions and navigating a dynamic, often imperfect data environment. You will leverage your strong analytical skills, technical depth, and business domain understanding to uncover insights, refine existing tactics, and help identify new opportunities to enhance Marketing’s impact. What you’ll do: - Own marketing tests end-to-end, leveraging and contributing to our Python-based measurement workflows. - Collaborate with senior ICs to address critical data infrastructure needs, support org-wide migrations, and develop new analytical and measurement solutions. - Develop reporting and monitoring tools that surface business insights and increase visibility into marketing performance and impact. - Conduct deep-dive analyses to investigate questions related to performance, audiences, monetization, attribution, and data integrity. - Provide flexible analytical support across the team’s project portfolio, taking high-level direction from senior ICs while independently owning specific components of the solution. What you’ll bring: - 2–3 years of experience conducting quantitative analyses, ideally within a marketing or growth environment. &lt

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About this team and role: As a Senior Data Engineer at Mozilla, you will be a key member of our Data Engineering team. This team manages the entire data lifecycle: ingesting and transforming raw data into reliable, high quality models that empower Mozillians to make data informed decisions. You’ll bridge the gap between our technical systems and our business needs, helping us build a better data platform while making sure the data itself is easy for other teams to use and trust. Recent platform improvements the team has driven include launching a data catalog, introducing data observability, and implementing a medallion architecture to ensure our data is reliable, accurate, and accessible. Check out the Data@Mozilla blog for more details on our work. What you’ll do: - Build the pipes: You’ll build and manage our business data pipelines as well as transform Firefox telemetry data into structured high quality datasets Mozillians can rely on - Make data make sense: You’ll partner with data scientists, product, and marketing teams to turn complex datasets into the models and metrics that drive Mozilla’s decisions - Be a guardian of data quality: You’ll ensure our datasets stay accurate and performant by using our observability tools to monitor quality and joining a weekly triage rotation to resolve data issues as they arise - Evolve our platform: You’ll partner with other data engineers and platform engineers to improve how we work - Maintain data integrity: You’ll ensure our data governance and privacy policies are implemented and enforced across the tens of terabytes o

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About this team and role: The Firefox team is a community of engineers who care deeply about delivering the fastest, friendliest, most usable browser possible. We are responsible for making the things you see in the browser work securely, quickly, and well! Working in the open is the norm, and we contribute to the code driving the Firefox browser on a number of desktop platforms - Windows, Linux, and macOS. Our focus is on implementing and fixing things in Firefox as well as helping other teams make it excellent for our users. A Frontend Engineering Manager directs a team of geographically distributed engineers to constantly drive improvements to Firefox Desktop experience through innovations and enhancements to the browser user interface in Firefox. We need a leader who is dedicated to building exceptional teams, creating innovative solutions, delivering quality software, and influencing how the world uses the internet. Feel good about your work again! Pursue your future while working to protect the future of the internet for everyone, everywhere. What you’ll do: - Drive initiatives to deliver value to our users ensuring the software your team delivers is high quality, highly available, monitored, and maintainable. - Help the team navigate trade-offs and drive alignment in a fast-paced field; balancing quick delivery with thoughtful, long-term approaches across a portfolio of user experiences in the browser. - Communicate your team’s goals, the scope and risks of your projects, and own the delivery of initiatives on clear timelines. - Identify, build and iterate on engineering processes that support a high performing team. - Engage regularly 1-1 with your team to discuss both technical work and professional development; provide direct and honest feedback about their individual performances <li style="font-weight: 400;"

To learn the Hiring Ranges for this position, please select your location from the Apply Now dropdown menu. To learn more about our Hiring Range System, please click this link. Why Mozilla? Mozilla Corporation is a non-profit-backed technology company that has helped shape the internet for the better over the past 25 years. We’re the makers of Firefox , the privacy-focused web browser used by more than 225 million people around the world each month. As we look to the future, we’re working to shape the next 25 years of the internet—one that’s built for people, not just for profit. Mozilla Corporation is wholly owned by the 501(c) non-profit Mozilla Foundation , meaning we’re accountable not to shareholders, but to our mission. Alongside thousands of contributors and collaborators around the world, Mozillians design, build, and maintain open-source software that empowers people to use the internet on their own terms. About this team and role: We’re now seeking a Staff Solutions Engineer (France) to support the growth of Firefox Enterprise across France. This is a highly customer-facing technical role focused on helping enterprises evaluate, validate, and deploy Firefox Enterprise in secure, complex, and regulated environments. The ideal candidate brings deep technical credibility, strong enterprise architecture experience, and a passion for helping customers solve real-world security, deployment, and interoperability challenges. What you'll do: - Partner with Sales to support strategic enterprise opportunities. - Lead technical discovery and solution design with customers and partners. - Run workshops with customer stakeholders across security, infrastructure, IAM, endpoint management, and workplace technology. - Own the relationship to the customer’s technical counterparts during and after the sales process. - Help customers evaluate Firefox Enterprise in areas such as deployment, policy management, identity integration, logging, security controls, and operational fit. - Design and support pilots, proofs of concept, and rollout plans. - Advise customers on deployment models, architecture decisions, and integration approaches for enterprise environments. <li style="font-weight:

Why Thunderbird? Thunderbird is one of the world’s most trusted open-source email applications, empowering more than 20 million people globally. At MZLA, the team behind Thunderbird, we build privacy-respecting communication and productivity tools that help people manage their digital lives while staying in control of their data. We are open source by design. Our products are developed transparently and in collaboration with a global community of contributors, and that same spirit shapes how we work: collaboratively, inclusively, and with a shared commitment to putting users first. We are a small but growing company of 60+ people distributed across seven countries. As Thunderbird evolves beyond a single desktop application, we are expanding across desktop, mobile, paid services, and new product experiences that help people and organizations work more effectively without giving up control to big tech ecosystems. Our revenue model combines user donations, which help keep Thunderbird’s apps freely available, with paid services that cover the costs of hosted offerings while supporting long-term sustainability and continued innovation. A note about MZLA and Mozilla: MZLA Technologies Corporation is the nonprofit-owned company behind Thunderbird and part of the Mozilla family. MZLA is separate from Mozilla Corporation and has its own compensation programs, benefits, and employment policies. To learn more, visit www.thunderbird.net The opportunity Thunderbird is growing beyond our free desktop and mobile applications, and we’re looking for a Senior Manager, Web Applications to lead day-to-day engineering execution and people management for the team responsible for MZLA’s hosted subscription products. This is a critical product and revenue area for MZLA. The Senior Manager will help the team launch, maintain, and improve hosted services with strong delivery discipline, clear ownership, reliable engineering practices, and a continued focus on quality, privacy, reliability, and user trust. This is a small, growing team, and the right person will be a hands-on technical manager who wants to stay close to the codebase, product direction, service reliability needs, release readiness, and engineering tradeoffs while also leading people and improving how the team operates. As the Web Applications team continues to mature, this role will require an engaged manager who can help create structure, solve problems, support execution, and build stronger systems around the work. This role requires consistent overlap with EST time zone working hours, and we strongly prefer candidates located in or closely aligned with this time zone. What you’ll do - Lead day-to-day engineering execution in a hands-on management capacity, ensuring priorities, ownership, timelines, risks, dependencies, and quality expectations are clear. - Manage Web Services engineers and contr

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About this team and role: We are seeking a strategic, pragmatic, and proactive Privacy Counsel to join our privacy legal team! This role will focus primarily on building, operationalizing, and maintaining Mozilla’s core privacy compliance infrastructure and scalable privacy governance processes across our global organization. Working remotely, you will serve as frontline privacy counsel for internal privacy matters, advising teams across Mozilla on operational privacy risks, enterprise data governance, third-party risk management, and incident response. You will partner closely with legal, security, IT, engineering, procurement, people, trust and safety, and other cross-functional stakeholders to help operationalize privacy-by-design principles across Mozilla’s internal systems and enterprise processes, and develop our privacy compliance and risk-management strategy. This is a highly collaborative and execution-oriented role for someone who thrives in ambiguity, takes ownership of complex initiatives, and can independently drive programs from strategy through implementation. We’re a small legal team, so this role requires someone who is both a leader and a “doer” - someone with deep expertise but who isn’t above rolling up their sleeves to take on tasks necessary to help make sure the job gets done. The ideal candidate combines strong substantive privacy expertise with experience building durable compliance infrastructure and managing enterprise privacy operations in a fast-moving technology environment. What you'll do: - Lead the development, implementation, and ongoing maintenance of Mozilla’s core privacy compliance infrastructure, including enterprise data mapping and records of processing activities. - Independently drive complex cross-functional privacy initiatives and operationalize scalable governance processes with minimal oversight. - Evaluate and advise on evolving U.S., European, and international privacy and AI related regulatory developments and industry guidelines relevant to enterprise operations and internal data governance. - <span style

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About this team and role: addons.mozilla.org (AMO) is the foundation of the Firefox add-ons ecosystem. It’s a showcase for developers to publish and grow their extensions, and a place of discovery for millions of users who customize Firefox to make it their own. Behind the scenes are the DevHub which enables developers to manage their extensions. To manage the ecosystem there are a series of Reviewer tools and automated moderation systems. As a Senior Software Engineer - Operations, you’ll bring a passion for crafting resilient systems that accelerate our review and operations team to provide a first-class experience for Add-on developers. You’ll work closely with engineers, reviewers, developer relations, and Add-ons leadership to turn ideas into polished features, modernize the platform and its architecture, and see your work reach millions of people around the world. What you’ll do: - Deliver major features and architectural improvements across the Add-ons stack, including automated moderation pipelines, Reviewer tools, and DevHub. - Create robust observability systems and data-backed insights. - Provide peer feedback, share knowledge and help others grow. - Improve platform reliability through deployments, monitoring, and incident response. - Help keep the platform safe and trustworthy, with attention to security and user trust. - Step in to resolve issues impacting users and developers, from small bugs to larger incidents. - Collaborate with designers, product managers, QA, and community contributors to deliver end-to-end improvements. - Contribute in the open through pull requests, code reviews, and discussions. - <span style="

Why Thunderbird? Thunderbird is one of the world’s most trusted open-source email applications, empowering more than 20 million people globally. At MZLA, the team behind Thunderbird, we build privacy-respecting communication and productivity tools that help people manage their digital lives while staying in control of their data. We are open source by design. Our products are developed transparently and in collaboration with a global community of contributors, and that same spirit shapes how we work: collaboratively, inclusively, and with a shared commitment to putting users first. We are a small but growing company of 60+ people distributed across seven countries. As Thunderbird evolves beyond a single desktop application, we are expanding across desktop, mobile, paid services, and new product experiences that help people and organizations work more effectively without giving up control to big tech ecosystems. Our revenue model combines user donations, which help keep Thunderbird’s apps freely available, with paid services that cover the costs of hosted offerings while supporting long-term sustainability and continued innovation. A note about MZLA and Mozilla: MZLA Technologies Corporation is the nonprofit-owned company behind Thunderbird and part of the Mozilla family. MZLA is separate from Mozilla Corporation and has its own compensation programs, benefits, and employment policies. To learn more, visit www.thunderbird.net and www.thunderbolt.io. The opportunity Thunderbolt is an open-source, cross-platform AI product initiative from the team behind Thunderbird. It is being built around a clear principle: people and organizations should be able to use AI while staying in control of their data, infrastructure, model choices, and long-term options. Thunderbolt is designed to support flexible deployment models, integrations with AI tools and workflows, and use cases across desktop, web, and mobile. We are looking for a Senior Engineering Manager to lead engineering execution, people management, and operating practices for Thunderbolt as it moves from R&D incubation into a more mature product and enterprise development phase . This role will help the team define what production-ready means at this stage: stronger release discipline, clearer ownership, higher user-facing product quality, stronger engineering practices, and a more scalable operating model. This is a hands-on technical management role . The Senior Engineering Manager will manage a senior engineering team, stay closely engaged with the codebase and technical execution , coordinate work across employees, contractors, and technical partners, and help the team deliver a reliable, enterprise-ready open-source AI product. The right person will bring strong people management skill

To learn the Hiring Ranges for this position, please select your location from the Apply Now dropdown menu. To learn more about our Hiring Range System, please click this link. Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About this role: Mozilla’s Cloud Engineering team seeks a Senior Software Engineer to mature, maintain, and build features for our Internal Developer Infrastructure Platform. You will work on creating standardized, scalable systems for CI/CD, Observability, Kubernetes optimization, environment bootstrapping, cost optimization, and more. Supporting the Infrastructure needs of the organization and identifying new opportunities to mature the path to production in a safe, cost effective way will also be an integral part of this role. What you’ll do: - Support infrastructure that development teams use to own and operate their services at Mozilla. - Guide technical decision-making and adoption of user-centric solutions. - Create Claude skills and design agentic workflows that improve developer productivity - Guide team members and promote engineering standard methodologies, with a focus on usability and maintainability. - Facilitate cross-functional collaboration for efficient and cohesive platform delivery. - Write proposals and decision briefs for new policies, processes, and platform functionality. - Create new features for the platform with a meaningful value proposition - Be trusted to resolve unclear but ur

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser, and Pocket, a service for keeping up with the best content online. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About the Team & Role The AI Platform team is responsible for building the foundational infrastructure that powers intelligent experiences across Mozilla products. This includes model training pipelines, high-throughput inference services, GPU orchestration, and secure, privacy-respecting AI systems that operate reliably at global scale. We’re looking for a Senior Software Engineer with a strong platform mindset to help design, build, and operate Mozilla’s AI platform. In this role, you’ll work at the intersection of machine learning, distributed systems, and production infrastructure—ensuring that models can be trained, deployed, and served efficiently, securely, and at scale. You will collaborate closely with product, infrastructure, and security teams to enable fast iteration while meeting strict performance and privacy requirements. What You’ll Do - Design, build, and operate core platform services and APIs used to deploy and serve production workloads at scale. - Own service reliability end-to-end, driving improvements in availability, scalability, performance, and operational excellence. - Lead efforts to optimize backend services for throughput, latency, and cost efficiency across distributed infrastructure. - Design and manage Kubernetes-based workloads, including GitOps deployment pipelines, environment configuration, and resource utilization optimization. - Own and improve critical parts of the service lifecycle, including packaging, versioning, testing strategies, validation, and deployment automation. - Implement and evolve observability practices (metrics, logging, tracing, alerting) to improve visibility and operational resilience of backend services and pipelines. <li style="font-weight: 400;"

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security, and more. And we’re doing this without losing focus on our core mission - to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders - only to our mission. Along with thousands of volunteer contributors and collaborators worldwide, Mozillians design, build, and distribute open-source software that enables people to enjoy the internet on their terms. About this team and role: A Staff Operations Engineer leads the design, reliability, and evolution of hybrid-cloud and workplace infrastructure. This senior role spans teams, drives complex initiatives, sets technical direction, and ensures systems are scalable, secure, and efficient. This role combines technical execution with leadership , shaping architecture both directly and collaboratively. What you’ll do: Domain Architecture & Technical Direction - Own and evolve architecture within a defined infrastructure domain - Design and implement scalable, reliable systems spanning multiple teams or environments - Establish and promote best practices, patterns, and standards within the domain - Contribute to medium- and long-term technical strategy (typically 6-18 months) Complex Problem Solving & Execution - Lead delivery of ambiguous, high-impact infrastructure projects - Break down elaborate system problems into implementable solutions - Drive migrations, re-architectures, and performance/reliability improvements - Remain hands-on with critical systems and implementations Cross-Team Collaboration - Work across teams (IT, SRE, Security, Service Owners) to unify solutions. - Influence technical decisions through design reviews and collaboration - <span style="font

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. What you’ll do: - Advance Firefox's security architecture and cryptography stack: Contribute to improvements in Firefox's core security systems, with a focus on cryptographic protocols, WebPKI, and security-sensitive web APIs. Help implement and maintain security features that support the evolution of public key infrastructure on the web. - Design and implement web platform security features: Develop and ship web platform features in collaboration with teammates and the broader web community. Contribute to standards-based, secure, and interoperable implementations across Firefox. - Improve browser reliability, performance, and resource efficiency: Investigate and resolve issues impacting stability, correctness, and performance. Analyze and improve memory usage and efficiency within a complex, multi-threaded browser environment. - Collaborate on security initiatives: Partner with engineers across teams to identify, prioritize, and address security issues. Participate in debugging, root cause analysis, and implementation of effective long-term solutions. - Contribute to technical design and planning: Participate in technical discussions, design reviews, and project planning for security-related initiatives. Help evaluate tradeoffs and contribute to engineering decisions within your area of work. What you’ll bring: - Strong software engineering and security fundamentals: Experience in software engineering, with proficiency in C/C++ and a solid understanding of security principles, including cryptographic protocols and implementations. - Experience building and maintaining complex software systems: Ability to contribute to the design, implementation, testing, and maintenance of software in large-scale or security-sensitive environments.</s

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About this team and role: The WebExtensions platform powers the add-ons ecosystem in Firefox, enabling millions of users to customize their browser while keeping safety and performance at the forefront. As a WebExtensions Engineer, you will help implement new extension capabilities, improve existing APIs, and ensure that extensions remain reliable across Firefox. As a Software Engineer on the WebExtensions team, you’ll bring a passion for exploring complex systems and creating experiences that balance developer power with user trust. You’ll work deep in the Gecko platform to evolve extension capabilities, and you’ll build UI features in Firefox that make extensions clear and manageable for users. Along the way, you’ll collaborate with experts across Mozilla and help advance cross-browser compatibility and the path toward standardization. Your work will keep extensions safe, powerful, and reliable for developers and millions of Firefox users. What you’ll do: - Implement and maintain WebExtensions APIs and Addon Management, balancing power, safety, and performance, as well as user interfaces in Firefox. - Debug and fix issues affecting extensions in Firefox. - Collaborate with product managers, QA, and the AMO engineering team to deliver features end-to-end. - Contribute to Mozilla-owned extensions and system add-ons. - Participate in open source workflows: code reviews, pull requests, and discussions in Bugzilla/GitHub. - Support extension developers by helping diagnose issues and improving tooling/documentation. Wh

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. What you’ll do: - Advance Firefox's security architecture and cryptography stack: Contribute to improvements in Firefox's core security systems, with a focus on cryptographic protocols, WebPKI, and security-sensitive web APIs. Help implement and maintain security features that support the evolution of public key infrastructure on the web. - Design and implement web platform security features: Develop and ship web platform features in collaboration with teammates and the broader web community. Contribute to standards-based, secure, and interoperable implementations across Firefox. - Improve browser reliability, performance, and resource efficiency: Investigate and resolve issues impacting stability, correctness, and performance. Analyze and improve memory usage and efficiency within a complex, multi-threaded browser environment. - Collaborate on security initiatives: Partner with engineers across teams to identify, prioritize, and address security issues. Participate in debugging, root cause analysis, and implementation of effective long-term solutions. - Contribute to technical design and planning: Participate in technical discussions, design reviews, and project planning for security-related initiatives. Help evaluate tradeoffs and contribute to engineering decisions within your area of work. What you’ll bring: - Strong software engineering and security fundamentals: Experience in software engineering, with proficiency in C/C++ and a solid understanding of security principles, including cryptographic protocols and implementations. - Experience building and maintaining complex software systems: Ability to contribute to the design, implementation, testing, and maintenance of software in large-scale or security-sensitive environments.</s

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. What you’ll do: - Advance Firefox's security architecture and cryptography stack: Contribute to improvements in Firefox's core security systems, with a focus on cryptographic protocols, WebPKI, and security-sensitive web APIs. Help implement and maintain security features that support the evolution of public key infrastructure on the web. - Design and implement web platform security features: Develop and ship web platform features in collaboration with teammates and the broader web community. Contribute to standards-based, secure, and interoperable implementations across Firefox. - Improve browser reliability, performance, and resource efficiency: Investigate and resolve issues impacting stability, correctness, and performance. Analyze and improve memory usage and efficiency within a complex, multi-threaded browser environment. - Collaborate on security initiatives: Partner with engineers across teams to identify, prioritize, and address security issues. Participate in debugging, root cause analysis, and implementation of effective long-term solutions. - Contribute to technical design and planning: Participate in technical discussions, design reviews, and project planning for security-related initiatives. Help evaluate tradeoffs and contribute to engineering decisions within your area of work. What you’ll bring: - Strong software engineering and security fundamentals: Experience in software engineering, with proficiency in C/C++ and a solid understanding of security principles, including cryptographic protocols and implementations. - Experience building and maintaining complex software systems: Ability to contribute to the design, implementation, testing, and maintenance of software in large-scale or security-sensitive environments.</s