Staff Firefox Performance Engineer

<div class="gmail_default" style="font-size: small;"> <div> <p><strong>Why Mozilla?</strong></p> <p><span style="font-weight: 400;">Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people.&nbsp;</span></p> <p><span style="font-weight: 400;">The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute </span><strong>open-source</strong><span style="font-weight: 400;"> software that enables people to enjoy the internet on their terms.&nbsp;</span></p> <p><strong>About this team and role:</strong></p> <p><span style="font-weight: 400;">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.</span></p> <p><span style="font-weight: 400;">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.</span></p> <p><span style="font-weight: 400;">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.</span></p> <strong>What you'll do:</strong> <ul> <li style="font-weight: 400;"><span style="font-weight: 400;">Write code and tests, build prototypes, tackle problems, profile and analyze performance bottlenecks</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">Learn about a wide variety of problems and solutions across a large, complex, and evolving codebase</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">Use several programming languages (e.g., C++, JavaScript, Kotlin, Rust, Python) and techniques to fix performance issues, with an emphasis on C++ and JavaScript</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">Help to educate engineers on other teams about writing more performant code through code reviews, giving talks, implementing tooling, and/or writing documentation</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">Break down complex performance problems into actionable next steps and drive them to completion</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">Partner with engineering teams across the organization to support performance efforts, and lead them within your area</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">Contribute to the direction of performance benchmarks and help prioritize the improvements that matter most</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">Own the performance of a significant area of the browser end to end, and contribute to the Performance team's technical roadmap</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">Work with driven, committed team members to help bring the Open Web to millions of people&nbsp;</span></li> </ul> <strong>What you'll bring:</strong> <ul> <li style="font-weight: 400;"><span style="font-weight: 400;">BS/MS in CS or CE, and 5+ years of relevant experience</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">Deep proficiency in C++</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">Working proficiency in JavaScript</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">You have proven experience developing performance-critical software</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">You take an experimental and measured approach to solving problems (measurement, and using experiments to diagnose an issue or prove out a solution)</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">Proven skill in debugging and analyzing performance bottlenecks, and using profiling tools to diagnose and fix issues (VTune, Xperf, other sampling based profilers)</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">Experience with at least one of: multithreading and concurrency, disk I/O, or GPU work</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">Track record of driving projects to completion, including work spanning more than one engineer.</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">Experience collaborating with engineers on other teams to deliver shared goals.</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">An interest and ability to work in a distributed team (which requires good asynchronous written communication skills as well as good verbal communication skills)</span></li> </ul> <strong>Bonus points if you have any of the following:</strong> <ul> <li style="font-weight: 400;"><span style="font-weight: 400;">Familiarity with Web Standards or patterns</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">Familiarity with Android or Windows OS application programming</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">A solid understanding of statistics</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">Prior experience working on a modern web browser</span></li> </ul> <p><span style="font-weight: 400;">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.</span></p> <p><strong>What you’ll get:</strong></p> <ul> <li style="font-weight: 400;"><span style="font-weight: 400;">Generous performance-based bonus plans to all eligible employees - we share in our success as one team</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">Rich medical, dental, and vision coverage</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">Generous retirement contributions with 100% immediate vesting (regardless of whether you contribute)</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">Quarterly all-company wellness days where everyone takes a pause together</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">Country specific holidays plus a day off for your birthday</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">One-time home office stipend</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">Annual professional development budget</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">Quarterly well-being stipend</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">Considerable paid parental leave</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">Employee referral bonus program</span></li> <li style="font-weight: 400;"><span style="font-weight: 400;">Other benefits (life/AD&amp;D, disability, EAP, etc. - varies by country)</span></li> </ul> <p><strong>About Mozilla&nbsp;</strong></p> <p>Mozilla exists to