Staff Firefox Performance Engineer

Mozilla

1d•$139,000 - $218,000•Remote

About The Position

The Mozilla Firefox Performance team is a community of engineers who care deeply about delivering the fastest browser possible. They are responsible for making all parts of the browser go fast. The team is geographically-distributed, and working in the open is the norm. They contribute to the code driving the Firefox browser on a number of platforms - Windows, Android, Linux, and macOS. Their focus is on finding and fixing things that slow down the browser as well as helping other teams write fast and reliable code to make Firefox excellent for users.

Requirements

BS/MS in CS or CE, and 5+ years of relevant experience
Deep proficiency in C++
Working proficiency in JavaScript
Proven experience developing performance-critical software
Take an experimental and measured approach to solving problems (measurement, and using experiments to diagnose an issue or prove out a solution)
Proven skill in debugging and analyzing performance bottlenecks, and using profiling tools to diagnose and fix issues (VTune, Xperf, other sampling based profilers)
Experience with at least one of: multithreading and concurrency, disk I/O, or GPU work
Track record of driving projects to completion, including work spanning more than one engineer.
Experience collaborating with engineers on other teams to deliver shared goals.
An interest and ability to work in a distributed team (which requires good asynchronous written communication skills as well as good verbal communication skills)

Nice To Haves

Familiarity with Web Standards or patterns
Familiarity with Android or Windows OS application programming
A solid understanding of statistics
Prior experience working on a modern web browser

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, complex, and evolving codebase
Use several programming languages (e.g., C++, JavaScript, Kotlin, Rust, Python) and techniques to fix performance issues, with an emphasis on C++ and JavaScript
Help to educate engineers on other teams about writing more performant code through code reviews, giving talks, implementing tooling, and/or writing documentation
Break down complex performance problems into actionable next steps and drive them to completion
Partner with engineering teams across the organization to support performance efforts, and lead them within your area
Contribute to the direction of performance benchmarks and help prioritize the improvements that matter most
Own the performance of a significant area of the browser end to end, and contribute to the Performance team's technical roadmap
Work with driven, committed team members to help bring the Open Web to millions of people

Benefits

Generous performance-based bonus plans to all eligible employees
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)