About the role

Senior Staff Performance Engineer optimizing Mozilla’s Firefox browser. Profiling bottlenecks, improving benchmarks, and guiding performance engineering across a distributed team.

Responsibilities

Write code and tests, build prototypes, tackle problems, and profile and analyze performance bottlenecks
Learn about problems and solutions across a large, complex, evolving codebase
Use C++, JavaScript, Kotlin, Rust, and Python to fix performance issues, emphasizing C++ and JavaScript
Educate engineers on other teams about performant code through code reviews, talks, tooling, and documentation
Independently define and drive actionable next steps from high-level objectives
Work with engineering teams across the organization to assist with and lead performance efforts
Shape future performance benchmarks and set priorities for necessary improvements
Develop strategies for the future of the Performance team and organization
Collaborate with committed team members to help bring the Open Web to millions of people

BS/MS in CS, CE and 7+ years relevant experience
A mastered understanding of programming in C++
An understanding of programming in JavaScript
Proven experience developing performance critical software
Experimental and measured approach to solving problems, including measurement and experiments
Proven skill in debugging and analyzing performance bottlenecks and using profiling tools such as VTune and Xperf
Experience with multithreading and concurrency, disk I/O, and GPU
Proven track record of setting team goals and driving them to completion
Experience motivating and aligning cross-functional teams to deliver shared goals
Ability and interest in working in a distributed team, with strong asynchronous written and verbal communication skills
Bonus: Familiarity with Web Standards or patterns
Bonus: Familiarity with Android or Windows OS application programming
Bonus: Solid understanding of statistics
Bonus: Prior experience working on a modern web browser

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)