A lot of companies say they’re “mission-driven.” Our unique corporate structure guarantees that every decision we make upholds our mission: to ensure the internet remains open and accessible. Beholden to neither shareholders nor investors, Mozilla Corporation is wholly owned by the not-for-profit Mozilla Foundation. Along with our communities of 20,000+ contributors and collaborators, Mozilla Corporation’s staff designs, builds, and distributes software that allows people to enjoy the internet on their own terms. Our flagship product — the Firefox browser — has expanded into a family of products that protects users and alerts them of risks, safeguards passwords and provides a secure VPN (with more to come). By maintaining a safe, open internet we're helping humanity, while also helping the individual humans employed here to reach their personal and professional goals. With a relatively small team serving hundreds of millions of people, a culture of exploration, and a commitment to mentorship, opportunities abound to learn and grow at Mozilla.
Remote · Canada
You will diagnose and verify long-tail WebCompat bugs to reduce the backlog of site-breakage issues. Additionally, you will write interventions and AI-assisted fixes to resolve reported breakages.
Remote · Canada, Germany, United Kingdom
The analyst will audit Gecko engine telemetry to identify data gaps and develop sanitization frameworks to filter bot traffic. They will also create automated dashboards and deliver behavioral inference reports to translate technical performance data into actionable product strategy.
Remote · Canada, Germany, United Kingdom
The role involves implementing storage encryption across the Firefox browser engine and migrating data between schemas. You will also be responsible for writing tests, performing code reviews, and shepherding features through the release cycle.
Remote · Canada
You will design and develop standards-compliant CSS and page layout features while focusing on Asynchronous Pan and Zoom (APZ) technology. You will also collaborate with a global team to write high-quality, performant code and participate in code reviews and long-term planning.
Remote
The role You will help the Firefox DOM Core team improve the health of the Session History area. You will write tests to improve the coverage; you will fix tests and/or problems to improve the Gecko correctness. Responsibilities Write Web-Platform tests to improve the coverage, and Gecko mochitests as needed Fix the problems and pass the tests to improve the Gecko correctness Work through code review with the relevant Gecko module owners and iterate to landing Definition of done Improved Session History test coverage and code correctness in Gecko, measured by passed test cases,…
Remote
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 bette…
Remote · Canada, Germany, United Kingdom
The analyst will bridge the gap between engineering telemetry and product strategy by developing automated dashboards and data sanitization frameworks. They are responsible for conducting deep-dive behavioral inference reports to correlate technical performance with user engagement trends.
Remote
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 bette…
Remote · Canada, Germany, United Kingdom
You will be responsible for diagnosing and resolving the backlog of WebCompat bugs to improve Firefox site compatibility. This involves reproducing issues, writing interventions, and utilizing AI-assisted tools to implement fixes.
Remote
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 bette…
Remote · Canada
You will design, develop, and evolve the Thunderbird iOS application while establishing a strong technical foundation for the product. You will also collaborate with cross-functional teams and the open-source community to ensure high standards for performance, reliability, and accessibility.
Remote · Canada
You will lead the technical architecture and development of new web-based services while mentoring other engineers to ensure scalable and sustainable software patterns. You will also collaborate with cross-functional teams and the open-source community to solve complex problems and drive product growth.
Remote · Canada
You will lead backend development and own the end-to-end lifecycle of services, including deployment, operation, and maintenance in production. You will also collaborate with cross-functional teams to build resilient systems and participate in an on-call rotation to ensure service reliability.
Remote · Canada
You will deliver major features and architectural improvements across the Add-ons stack, including automated moderation pipelines and developer tools. Additionally, you will ensure platform reliability through monitoring, incident response, and the implementation of robust observability systems.
Remote · Canada, France, Germany, United Kingdom
You will build and maintain internal dashboards and reporting tools to support the WebCompat team's triage and prioritization efforts. Additionally, you will improve the broken-site-report screenshot capture pipeline to enhance data-driven decision making.
Remote · Canada
The role involves maintaining the Firefox graphics area by handling bug fixes, regressions, and test upkeep. You will diagnose and resolve graphics issues across multiple platforms while performing code reviews to support the engineering team.
Remote
You will take on the ongoing maintenance and routine engineering work in Firefox’s Layout area (CSS, page layout, APZ, text, images). Working independently at a tech-lead level, you keep the Layout code healthy. Responsibilities Own day-to-day Layout maintenance: fix bugs and regressions, keep tests green, handle incoming issues. Diagnose and fix Layout problems across platforms (Windows, macOS, Linux, Android). Carry code review and routine upkeep so the FTE engineers can focus on other mission critical projects. . Join planning and standards / web-compat meetings as needed. Defi…
Remote
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 bette…
Remote
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 bette…
Remote
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 bette…