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

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

Independently define and drive actionable next steps from high level objectives

Work with engineering teams across the organization to assist and lead performance efforts

Shape the future of performance benchmarks, and set the proper priorities for the necessary improvements

Develop strategies for the future of the Performance team and the Organization as a whole

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 advantages 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.

BS/MS in CS, CE and 7+ years relevant experienceAn interest and ability to work in a distributed team (which requires good asynchronous written communication skills as well as good verbal communication skills)Proven track record of setting team goals and driving them to completionAn understanding of programming in JavaScriptExperience with multithreading and concurrency, disk I/O, GPUA mastered understanding of programming in C++Proven skill in debugging and analyzing performance bottlenecks, and using profiling tools to diagnose and fix issues (VTune, Xperf, other sampling based profilers)You have proven experience developing performance critical softwareYou take an experimental and measured approach to solving problems (measurement, and using experiments to diagnose an issue or prove out a solution)Experience motivating and aligning cross-functional teams to deliver on shared goalsWe 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 patternsA solid understanding of statisticsFamiliarity with Android or Windows OS application programmingPrior experience working on a modern web browser

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📌 Senior Staff Performance Engineer (Firefox) (Montreal)
🏢 Mozilla
📍 Montreal