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Software Engineer

at Mozilla Corporation

Team: Firefox

Locations: Remote UK

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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:

Join the global DOM: Core team of engineers passionate about the Web. We are responsible for page navigation, document loading, event handling, user interaction, and text editing in Gecko, the engine behind Firefox. You will implement standardized APIs like DOM, HTML, Events, Editor, and Clipboard. Your role involves writing code, tests, building prototypes, solving problems, and continuous learning and growth as an engineer.

What you’ll do:

• Improve the DOM, HTML, editing, user interaction capabilities of our Web engine, focusing on performance, Web compatibility, and standards correctness.
• Read and implement API specifications, contribute to standards discussions, and raise issues.
• Develop and debug in a multi-language, multi-threaded, multi-process code base.
• Work primarily in C++ and write tests with HTML and JavaScript. You will learn on the job!
• Collaborate with a geographically distributed development team. Working in the open is the norm.

What you’ll bring:

• Proficiency in and experience developing software in C++.
• Ability to learn a large and complex code base quickly.
• Comfortable contacting people and driving discussions.
• Motivated to learn new tools and techniques for improving existing software.
• Familiarity with or ability to learn:
• Multi-process architecture
• Debugging memory usage or performance profiling
• The modern Web technologies (JavaScript, HTML, CSS)
• Commitment to our values:
• Welcoming differences
• Being relationship-minded
• Practicing responsible participation
• Having grit

What you’ll get:

• Generous performance-based bonus plans to all eligible employees.
• Rich medical, dental, and vision coverage.
• Generous retirement contributions with 100% immediate vesting.
• Quarterly all-company wellness days.
• 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).