Requirements:

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.

Nice to haves:

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.

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).