Proven skill in debugging and analyzing performance bottlenecks
Experience with multithreading, disk I/O, or GPU work
Responsibilities
Write code and tests, build prototypes, and analyze performance bottlenecks
Learn about diverse problems across a complex codebase
Use multiple programming languages to address performance issues
Educate engineers on writing performant code through reviews and documentation
Break down complex performance problems into actionable steps
Partner with engineering teams to support performance efforts
Contribute to performance benchmarks and prioritize improvements
Benefits
Generous performance-based bonus plans
Rich medical, dental, and vision coverage
Generous retirement contributions with immediate vesting
Quarterly wellness days for all employees
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
Full Job Description
About this team and role:
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. What you'll do:
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
What you'll bring:
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)
Bonus points if you have any of the following:
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
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.
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)
Hiring Ranges:
US Tier 1 Locations
$163,000-$218,000 USD
US Tier 2 Locations
$150,000-$200,000 USD
US Tier 3 Locations
$139,000-$185,000 USD
About Mozilla
Mozilla is a global community of technologists, thinkers, and builders working together to keep the internet open and accessible to all. The company is best known for its flagship product, the Firefox web browser, which is used by millions of people around the world. In addition to its browser, Mozilla also develops a range of other products and services, including a mobile operating system, a password manager, and a virtual private network (VPN) service.
