Senior Software Engineer, OS Integration - 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 staying focused 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 the OS Integration Team

The OS Integration team ensures Firefox works well with the host operating system and environment. We’re a distributed team with expertise in Windows, macOS, and Linux-based operating systems. Our responsibilities include developing fixes and improvements for Firefox related to Windows, macOS, and Linux environments (e.g., integrating a new OS feature or fixing an OS-specific UI bug). Other responsibilities include native crash reporting, OS abstraction layers, sandboxing, hardening, updater, and enterprise DLP support.

About the Role

As a member of the OS Integration team, you’ll develop fixes, improvements, and new features for Firefox. In many cases, work may be cross-platform or have a cross-platform component. This role will include maintenance and development of the installer and updater of Firefox. You’ll contribute to the team through code review and technical discussion.

What You'll Do

• Improve the quality of Firefox and other Mozilla products by debugging and fixing software defects, improving the browsing experience for hundreds of millions of users.
• Contribute to new features and technical improvements.
• Break down tasks and work collaboratively to deliver solutions.
• Collaborate with experienced software engineers across a geographically-distributed development team.
• Perform code reviews and provide technical direction.
• Interact with cross-functional teams throughout the organization.

What You'll Bring

• 5+ years of overall software engineering experience.
• Strong knowledge of C and C++.
• Experience with desktop application development on Windows, macOS, or Linux with C++.
• Knowledge of web technologies such as JavaScript and HTML.
• Knowledge of secure coding practices and memory safety concerns.
• Strong problem-solving and debugging skills.
• Excellent written and verbal communication skills with a collaborative mindset.
• Willingness to work effectively in a distributed team environment.
• Commitment to Mozilla's core values: Play to win, Build for People first, Engage Evidence over Ego, Decide and Deliver, Ship, learn and repeat.

Bonus Points

• Experience with installer and/or updater development on any OS.
• Knowledge of Windows internals like the BITS server or MSIX packages.
• Open-source contributions or personal engineering projects.

Benefits & Perks

• Generous performance-based bonus plans shared across all eligible employees.
• Comprehensive medical, dental, and vision coverage.
• Generous retirement contributions with 100% immediate vesting.
• Quarterly all-company wellness days off.
• Country-specific holidays plus a day off for your birthday.
• One-time home office stipend.
• Annual professional development budget.
• Paid parental leave.
• Employee referral bonus program.