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Senior Software Engineer, Firefox Performance

Mozilla

Salary not specified
Oct 6, 2025
Remote, US
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Mozilla Corporation is looking to solve the problem of delivering the fastest browser possible by finding and fixing performance bottlenecks in the Firefox browser

Requirements

  • 5+ years experience as a software engineer
  • A solid understanding and strong working experience in C++
  • Experience developing performance critical software
  • Proven experience taking an experimental and measured approach to solving problems
  • Strong debugging skills in analyzing performance bottlenecks
  • Experience with multithreading and concurrency, disk I/O, GPU, etc
  • Familiarity with Android or Windows OS application programming, profiling and debugging

Responsibilities

  • Write code and tests, build prototypes, tackle problems, profile and analyze performance bottlenecks
  • Learn about a wide variety of problems and solutions across a large, mature codebase
  • Use several programming languages (e.g., C++, JavaScript, Kotlin, Rust, Python) and techniques to fix performance issues, with an emphasis on C++
  • Help to educate engineers on other teams about writing more performant code through code reviews, giving talks, and/or writing documentation
  • Work with driven, committed team members to help bring the Open Web to millions of people

Other

  • Commitment to our values: Welcoming differences, Being relationship-minded, Practicing responsible participation, Having grit
  • Interest and ability to work in a distributed team (which requires good asynchronous written communication skills as well as good verbal communication skills)
  • 5+ years experience as a software engineer
  • Commitment to diversity, equity, inclusion, and belonging
  • Ability to work with people of all backgrounds and identities