Staff Firefox Performance Engineer

Mozilla; New York (NY); On-site; USD 180,000 - 240,000; Full time

Benefits offered by this job

Health benefits

Mental health support

Time off and wellness days

Parental leave

Job summary

Mozilla Firefox Performance team seeks engineers to drive the fastest browser on Windows, Android, Linux and macOS. You will write code and tests, profile bottlenecks, and help educate others to achieve faster, more reliable code across platforms.

You’ll use C++, JavaScript, Kotlin, Rust, Python and contribute to the performance roadmap while working in a distributed team to ship changes that matter to users worldwide.

Qualifications

• BS/MS in CS or CE and 5+ years of relevant performance roles.
• Deep proficiency in C++ and strong debugging of performance bottlenecks.
• Experience with multithreading, disk I/O, or GPU work and profiling tools.
• Ability to work in a distributed team with strong written and verbal communication.
• Experience 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, evolving codebase.
• Use languages like C++, JavaScript, Kotlin, Rust, Python to fix performance issues.
• Educate engineers on performance via code reviews, talks, tooling, and documentation.
• Break down complex problems and drive them to completion.
• Partner with engineering teams to support performance efforts and lead them.
• Contribute to performance benchmarks and the team roadmap.
• Own the performance of a significant browser area end-to-end.
• Collaborate with team members to bring the Open Web to millions.

Skills

C++

JavaScript

Multithreading

Profiling tools

Performance debugging

Distributed teamwork

Web standards

Android familiarity

Windows OS knowledge

Browser development

Education

BS/MS in CS or CE

Tools

VTune

Xperf

Job description

• 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

Benefits

• Health and wellness: Mozilla covers medical, dental and vision plan premiums at 100% for U.S. and Canadian employees. Our offerings give you the options you need to manage your health — and your family’s — the way you want.
• Mental health: Mental health is as important as our physical health. That’s why Mozilla’s health benefits include therapy and coaching sessions to make sure our people have access to the care they need.
• Time away: With all of life’s demands, time away from work to disconnect and recharge is essential. In addition to country-specific holidays (12 in the U.S. and Canada), vacation and sick time start accruing right away (specifics vary by country). Everyone also takes a pause together on quarterly all-company wellness days, plus you get to celebrate the most personal holiday of all: your birthday.
• Parental leave: While Mozilla’s parental leave policies vary globally, our U.S. and Canadian-based employees can look forward to 26 weeks of paid leave for childbearing parents and 12 weeks of paid leave for non-childbearing parents.
• Financial: Mozilla is a private company, so our compensation isn’t tied to stock options or equity plans. Instead, we offer generous, performance-based bonus plans to all regular employees to underscore that we share in our success as one team. As for retirement savings for US and Canadian employees, Mozilla contributes a percentage of your eligible base salary each year to the 401(k) Plan/RRSP (regardless of whether you contribute or not), with 100% vesting.
• Learning and development: We’re big believers in learning by doing, and we also want to invest in your education and development beyond your role. Every employee is eligible for an annual professional development budget. Mozillians can put it toward technical or management training, certifications, conferences and more.
• Help when you need it: Life is full of surprises; that’s why it’s important to be prepared. Mozilla provides Life/AD&D and Short and Long Term Disability insurance (offerings may vary by locale) to ensure that you and your family will have a safety net in place should you ever need it.
• Plus a bit more: A few other benefits include a quarterly wellbeing stipend (to use on those things just for you), an employee referral bonus, internet reimbursement if you’re remote, and a budget for office essentials to make working remotely ergonomically comfortable.

Experience collaborating with engineers on other teams to deliver shared goalsBS/MS in CS or CE, and 5+ years of relevant experienceYou take an experimental and measured approach to solving problems (measurement, and using experiments to diagnose an issue or prove out a solution)Experience with at least one of: multithreading and concurrency, disk I/O, or GPU workProven skill in debugging and analyzing performance bottlenecks, and using profiling tools to diagnose and fix issues (VTune, Xperf, other sampling based profilers)Deep proficiency in C++You have proven experience developing performance-critical softwareAn interest and ability to work in a distributed team (which requires good asynchronous written communication skills as well as good verbal communication skills)Working proficiency in JavaScriptTrack record of driving projects to completion, including work spanning more than one engineerWe value a variety of voices on the Performance Team and at Mozilla. You don’t need to check every box on this list to applyFamiliarity with Web Standards or patternsFamiliarity with Android or Windows OS application programmingA solid understanding of statisticsPrior experience working on a modern web browser