Staff Firefox Performance Engineer New Remote US

Applying; Northern (KY); Remote; USD 150,000 - 218,000; Full time

Benefits offered by this job

Performance-based bonus

Medical, dental, and vision coverage

Retirement contributions with 100% v.

Home office stipend

Professional development budget

Parental leave

Employee referral bonus

Other benefits

Job summary

Mozilla Corporation in the United States is seeking an experienced performance-focused engineer to own end-to-end browser performance, collaborating across teams to optimize speed on Windows, macOS, Android, and Linux.

You will work on profiling, multithreading, and writing fast code in C++/JavaScript, contributing to the Firefox engine and performance roadmap, with a distributed, open-source culture.

Qualifications

• BS/MS in CS or CE with 5+ years of relevant experience
• Strong C++ expertise required
• Experience with performance-critical software
• Profiling tools: VTune, Xperf
• Ability to work in a distributed team and communicate effectively
• Experience with multithreading or GPU/IO

Responsibilities

• Write code and tests, profile and analyze performance bottlenecks
• Learn across a large, evolving codebase
• Use C++, JavaScript to fix performance issues
• Educate engineers on writing more performant code
• Break down complex problems into actionable steps and drive to completion
• Partner with engineering teams to support performance efforts
• Contribute to performance benchmarks and roadmap
• Own the performance of a significant browser area end-to-end

Skills

C++

JavaScript

Performance profiling

Debugging bottlenecks

Multithreading

Cross-team collaboration

Asynchronous communication

Education

BS/MS in CS or CE

Tools

VTune

Xperf

Job description

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 open-source software that enables people to enjoy the internet on their terms.

About this team and role:

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.

Why Mozilla?

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.

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 open-source software that enables people to enjoy the internet on their terms.

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)

About Mozilla

Mozilla exists to build the Internet as a public resource accessible to all because we believe that open and free is better than closed and controlled. When you work at Mozilla, you give yourself a chance to make a difference in the lives of Web users everywhere. And you give us a chance to make a difference in your life every single day. Join us to work on the Web as the platform and help create more opportunity and innovation for everyone online.

Commitment to diversity, equity, inclusion, and belonging

Mozilla understands that valuing diverse creative practices and forms of knowledge are crucial to and enrich the company’s core mission. We encourage applications from everyone, including members of all equity-seeking communities, such as (but certainly not limited to) women, racialized and Indigenous persons, persons with disabilities, persons of all sexual orientation s, gender identities, and expressions.

We will ensure that qualified individuals with disabilities are provided reasonable accommodations to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment, as appropriate. Please contact us at [e-mail] to request accommodation.

We are an equal opportunity employer. We do not discriminate on the basis of race (including hairstyle and texture), religion (including religious grooming and dress practices), gender, gender identity, gender expression, color, national origin, pregnancy, ancestry, domestic partner status, disability, sexual orientation, age, genetic predisposition, medical condition, marital status, citizenship status, military or veteran status, or any other basis covered by applicable laws. Mozilla will not tolerate discrimination or harassment based on any of these characteristics or any other unlawful behavior, conduct, or purpose.

Hiring Ranges:

$163,000 - $218,000 USD

$150,000 - $200,000 USD

$139,000 - $185,000 USD

USA Demographic Questions

At Mozilla we value diversity, prioritize equity and inclusion, and proactively work to design hiring processes that mitigate bias. We are an equal opportunity employer. We do not discriminate on the basis of race (including hairstyle and texture), religion (including religious grooming and dress practices), gender, gender identity, gender expression, color, national origin, pregnancy, ancestry, domestic partner status, disability, sexual orientation, age, genetic predisposition, medical condition, marital status, citizenship status, military or veteran status, or any other basis covered by applicable laws. Mozilla will not tolerate discrimination or harassment based on any of these characteristics or any other unlawful behavior, conduct, or purpose.

To help us track the effectiveness of these efforts, please consider answering the following demographic questions. Answering these questions is entirely voluntary . Your decision to respond (or not) won't be considered in the hiring process or thereafter. Any information you do provide will have no impact on the hiring process. Should you become a Mozilla employee, the information provided will not be transferred to your employee profile. In addition, the information you provide will be aggregated and dis-identified, ensuring that your responses cannot be traced back to you personally by Mozilla.

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