Staff Firefox Performance Engineer, Mozilla

• BS/MS in CS or CE, and 5+ years of relevant experience
• Deep proficiency in C++
• Working proficiency in JavaScript
• You have proven experience developing performance-critical software
• You 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)
• We value a variety of voices on the Performance Team and at Mozilla. You don't need to check every box on this list to apply

Desirable

• The Mozilla Firefox Performance team is a community of engineers who care deeply about delivering the fastest browser possible. We are the team responsible for making all parts of the browser go fast
• Our team is geographically-distributed, and working in the open is the norm. We contribute to the code driving the Firefox browser on a number of platforms - Windows, Android, Linux, and macOS. Our 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
• Do you value curiosity and enjoy finding a needle in a haystack? Do you approach problems by looking at the system as a whole? Do you want to help lead and shape the future of the Internet? Do you like making things blazingly fast? If so, we’d love to hear from you
• 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