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Mozilla

Senior Software Engineer - Firefox Enterprise

100% Remote
Full-time
Senior or above
UK, Europe
Posted on December 7, 2025New

About the role

💼 What you will do

• Join the Firefox Enterprise team responsible for improving and maintaining Firefox support for large Enterprise deployments. • Handle all things related to OS integration such as updates, installs, and integrating Firefox with different operating systems. • Contribute to the code driving Firefox on desktop platforms including Windows, Linux, and macOS. • Work independently on scoped projects and collaborate closely with peers. • Help grow the Firefox user base through improved enterprise features.

📋 Job Requirements

• Experience with systems programming on a major desktop platform (Windows, macOS or Linux). • Solid understanding of C/C++ and some knowledge of Rust. • Solid understanding of JavaScript and typical interactions with the backend (services, REST, etc.). • Excellent communicator with experience participating effectively on a distributed team. • Pragmatic approach to moving things forward including trade-offs and safeguards when implementing new functionality. • Experience working collaboratively with product managers, project managers, and other non-engineering teams.

🌟 Nice-to-have

• Professional programming experience in Rust. • Experience developing cross-platform desktop applications. • Low level systems programming experience such as Win32 APIs on Windows, Cocoa APIs on macOS or GTK on Linux. • Previous successful contributions to an open source project. • Experience with browser development or enterprise software deployment. • Background in security-focused software development.

🎯 Responsibilities

• Develop, innovate, and ship the next experience of Firefox through improved integration with the operating system. • Improve the ease of use and security of Firefox in large deployments by developing better administration and monitoring tools. • Improve Firefox functionality by better integration with remote services. • Assess what work supports the team and product roadmap and make insightful recommendations on priorities. • Optimize the quality of Firefox by hunting down and fixing software defects. • Improve the experience of hundreds of millions of users. • Work with a geographically-distributed development team. • Contribute to architectural discussions and drive feature development within the team.

About Mozilla

😃 What Mozilla offers

• Generous performance-based bonus plans for all eligible employees. • Rich medical, dental, and vision coverage. • Generous retirement contributions with 100% immediate vesting. • 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. • Work at a non-profit-backed technology company shaping the internet for the better.

💖 What makes Mozilla unique

Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. They make pioneering brands like Firefox, the privacy-minded web browser. With more than 225 million people around the world using their products each month, they are shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Mozilla is wholly owned by the non-profit 501(c) Mozilla Foundation, meaning they are not beholden to shareholders, only to their mission.

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