Senior Systems Software Engineer

About this team and role:

The Performance Tools team builds frameworks and tools that help engineers measure and improve performance across Mozilla products. We’re a distributed team based in North America and Europe, supporting both internal Mozilla engineers and the broader web developer community through tools like the Firefox Profiler.

In this role, you will be responsible for low-level programming of the Firefox Profiler and other tools. Your focus will be on delivering an effective toolset for Firefox developers looking to track down and seize every opportunity to improve the quality of experience for our users. You will work closely with performance experts to identify and surface the most valuable measurements across a variety of platforms.

What you’ll do:

• Develop new features for the Firefox Profiler that will provide browser engineers and web developers with insight to improve the experience for their users.
• Expand the breadth of data captured by the Firefox Profiler without compromising on performance.
• Engage with the performance team efforts such as bug triage and strategy.
• Engage with other Firefox engineers to help them learn how to use our tools efficiently, and develop projects to serve them better.
• 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.

What you’ll bring:

• 5+ years of experience in systems software engineering using C++.
• 1+ year of experience in Rust.
• Expertise in at least one of the following operating system APIs and familiarity with the others: Windows/Linux/macOS/Android.
• Experience working on and debugging large multi-threaded applications and memory management.
• Strong and respectful communication skills and ability to collaborate across engineering teams.
• Familiarity with any of the following skills would be a plus: JavaScript, Java, Android development, Python.
• Commitment to our values:
• Welcoming differences
• Being relationship-minded
• Practicing responsible participation
• Having grit

What you’ll get:

• 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)