Frontend Senior Software Engineer

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Frontend Senior Software Engineer

at Mozilla Corporation Team: Firefox Locations: Remote France, Remote Germany, Remote UK To learn the Hiring Ranges for this position, please select your location from the Apply Now dropdown menu.

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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 Performance Tools team builds frameworks and tools that help engineers measure and improve performance across Mozilla products. We’re a distributed team based in North America and Europe, supporting both internal Mozilla engineers and the broader web developer community through tools like the Firefox Profiler.

In this role, you will work on the user interface of the Firefox Profiler. This includes implementing interactive performance visualizations, handling large-scale performance data efficiently in the browser, and improving usability for engineers across Mozilla. You will collaborate with systems engineers, browser developers, and other teams working on performance.

What you’ll do:

  • Design and develop modern, interactive UI components for the Firefox Profiler using TypeScript, React, Redux, and related web technologies.
  • Build high-performance, scalable, accessible, and maintainable user interfaces that visualize complex performance data.
  • Engage with other Firefox engineers to help them learn how to use our tools efficiently, and develop projects to serve them better.
  • Engage with the performance team efforts such as bug triage and strategy.
  • Promote and encourage the use of our performance tools within and beyond Mozilla by writing and talking about them.
  • Engage with our community and mentor volunteers contributing to the codebase.
    • What you’ll bring:
  • 5+ years of experience in JavaScript/TypeScript, React, Redux, and browser-based UI development.
  • A strong background in building complex, interactive UIs that manage large data sets efficiently.
  • Knowledge of profiling, performance tooling, and testing.
  • Knowledge of frontend testing frameworks (e.g., Jest, React Testing Library) and best practices in maintainable UI codebases.
  • Strong and respectful communication skills and ability to collaborate across engineering teams.
  • Experience working with performance visualization is a plus.
  • Familiarity with the Firefox Profiler or Chrome DevTools is a plus.
  • Commitment to our values:
  • Welcoming differences Being relationship-minded Practicing responsible participation Having grit
    • What you’ll get:
  • Generous performance-based bonus plans to all eligible employees - we share in our success as one team
  • Rich medical, dental, and vision coverage
  • Generous retirement contributions with 100% immediate vesting (regardless of whether you contribute)
  • Quarterly all-company wellness days where everyone takes a pause together
  • Country specific holidays plus a day off for your birthday
  • One-time home office stipend
  • Annual professional development budget
  • Quarterly well-being stipend
  • Considerable paid parental leave
  • Employee referral bonus program
  • Other benefits (life/AD&D, disability, EAP, etc. - varies by country)
    • Apply
    Location:
    London
    Job Type:
    FullTime

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