Software Engineer, Firefox Desktop Integrations - Mozilla

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—all while never losing our focus on our core mission: to make the internet better for people.

About the Team

The Firefox team is a community of engineers who care deeply about delivering the fastest, friendliest, most usable browser possible. We are responsible for making the things you see in the browser work securely, quickly, and well. The Desktop Integrations team is a cross-functional group focusing on updates, installs, and integrating Firefox with different operating systems. As part of this team, you will be responsible for OS integration (particularly Windows and macOS) and helping grow our user base.

Our team is geographically distributed, and working in the open is the norm. We contribute to the code driving the Firefox browser across all desktop platforms.

About the Role

A Software Engineer is an early-career individual contributor growing their ability to take on complex tasks. At Mozilla, this role involves working on engineering projects that typically span several weeks and require collaboration with peers. Engineers contribute to implementation, ask thoughtful questions, and raise blockers early while steadily building expertise in their domain.

What You’ll Do

• Assist in the development and maintenance of Firefox features related to installs, updates, and OS integrations.
• Work on improvements to the Firefox installation and update process with guidance from senior engineers.
• Support efforts to solve platform-specific challenges on Windows and/or macOS where Firefox interacts directly with the operating system.
• Collaborate with your manager and teammates to define and scope tasks, with regular check-ins to share progress and ask for support.
• Participate in code reviews to expand your understanding and maintain a high-quality codebase.
• Help identify and fix bugs that improve the Firefox experience for a global user base.
• Engage with a distributed team and contribute positively to an open, inclusive work environment.

What You’ll Bring

• Experience with systems-level programming on a major platform (e.g., Windows, macOS).
• Proficiency with C/C++ programming.
• Clear communication, a willingness to ask questions, and eagerness to seek feedback.
• Ability to contribute to collaborative projects and continuously build technical and problem-solving skills.
• A growth mindset and enthusiasm for contributing to impactful software.

Bonus Points

• Exposure to or experience with Rust.
• Familiarity with Linux or macOS internals.
• Exposure to native Windows or macOS APIs (such as Win32 or Cocoa).
• Previous participation in open-source projects or a strong interest in learning how to contribute.

What You’ll Get

• Generous performance-based bonus plans for all regular employees
• Comprehensive 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
• Generous paid parental leave
• Employee referral bonus program
• Life/AD&D, disability, and employee assistance programs