139K–218K USD / year
Staff Firefox Performance Engineer
OtherRemote — United States
Published on 2026-10-09
These details were extracted automatically from the original listing. They may not be complete or fully up to date — it's worth checking the original job post.
About this role
Improve Firefox performance across platforms by identifying bottlenecks, measuring outcomes, and delivering fixes in a large, evolving codebase. The role includes owning performance in a significant browser area and helping shape the Performance team’s technical roadmap.
About the company
Mozilla builds open-source products and technologies, including Firefox, that prioritize privacy, security, and an open internet.
The team
Mozilla Firefox Performance team
Stack
C++JavaScriptKotlinRustPythonVTuneXperf
What you'll do
- Write code and tests, build prototypes, and profile performance bottlenecks
- Break complex performance problems into actionable work and drive solutions to completion
- Partner with other engineering teams and lead performance work in your area
- Help engineers improve performance through reviews, talks, tooling, and documentation
- Contribute to benchmark direction and prioritize impactful improvements
- Own performance for a significant area of Firefox and contribute to the team roadmap
What we're looking for
- BS/MS in computer science or computer engineering and 5+ years of relevant experience
- Deep proficiency in C++ and working proficiency in JavaScript
- Experience developing performance-critical software
- Measured, experimental approach to diagnosing and validating performance improvements
- Experience debugging bottlenecks with profiling tools such as VTune or Xperf
- Experience with multithreading and concurrency, disk I/O, or GPU work
- Track record of driving projects to completion across multiple engineers
- Strong collaboration and written and verbal communication skills for distributed work
Nice to have
- Familiarity with web standards or patterns
- Android or Windows application programming experience
- Understanding of statistics
- Experience working on a modern web browser
Benefits
- Performance-based bonus plan
- Medical, dental, and vision coverage
- Retirement contributions with immediate vesting
- Quarterly company wellness days
- Country-specific holidays and a birthday day off
- One-time home office stipend and quarterly well-being stipend
- Annual professional development budget
- Paid parental leave