Mozilla

Senior Frontend Software Engineer

Mozilla

full-time

Posted on:

Location Type: Remote

Location: Remote • 🇫🇷 France

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Salary

💰 €53,000 - €77,000 per year

Job Level

Senior

Tech Stack

JavaScriptJestReactReduxTypeScript

About the role

  • 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.

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.
  • 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.
Benefits
  • 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)

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard skills
JavaScriptTypeScriptReactReduxUI developmentperformance toolingfrontend testing frameworksJestReact Testing Libraryperformance visualization
Soft skills
communication skillscollaborationmentoringengagementstrategybug triagecommunity involvementrespectful interactionrelationship-mindedgrit