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Mozilla

Frontend Software Engineer

Mozilla

. Improving existing Firefox features.

Posted 4/20/2026full-timeRemote • 🇺🇸 United StatesMid-LevelSeniorWebsite

Tech Stack

Tools & technologies
JavaScriptRust

About the role

Key responsibilities & impact
  • Improving existing Firefox features.
  • Working with multi-disciplinary teams to implement entirely new features.
  • Analyzing performance problems in Firefox to identify areas that need improvement.
  • Synthesizing bug reports into actionable tasks.
  • Ensuring Firefox aligns with relevant standards and works with real websites.
  • Increasing the quality of the data we collect to enable better decisions.

Requirements

What you’ll need
  • Good interpersonal and communication skills
  • The desire and ability to create excellent documentation
  • A good grasp of, JavaScript, HTML and CSS
  • Some knowledge of C++ and/or Rust
  • Motivation to learn new tools and techniques for improving existing software
  • BS in Computer Science or a related field or equivalent experience
  • Interest in multi-threaded systems, performance analysis, and optimization

Benefits

Comp & perks
  • 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)

ATS Keywords

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Hard Skills & Tools
JavaScriptHTMLCSSC++Rustperformance analysisoptimizationmulti-threaded systems
Soft Skills
interpersonal skillscommunication skillsdocumentation skills
Certifications
BS in Computer Science