Frontend Software Engineer

Mozilla

Frontend Software Engineer improving Firefox features and collaborating with global teams to implement new ones at Mozilla. Focused on enhancing user experience and performance of the web browser.

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

✓ Tailor your resume

Applicant Tracking System Keywords

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

Hard Skills & Tools

JavaScriptHTMLCSSC++Rustperformance analysisoptimizationmulti-threaded systems

Soft Skills

interpersonal skillscommunication skillsdocumentation skills

Certifications

BS in Computer Science