Senior Software Engineer, OS Integration

Remote CanadaRemoteFull-timeCA$104k–CA$139k2026-11-09 → 2026-11-10

Remote

Core

Develop fixes, improvements, and new features for Firefox to ensure it works well with Windows, macOS, and Linux operating systems, including installer/updater maintenance and OS-specific bug fixes.

Role type

Senior IC software engineer (OS integration)

Builds

Firefox browser, installer, and updater across multiple operating systems

Domain

Consumer internet / Desktop software

Required skills

C, C++, desktop application development, debugging, code review, secure coding practices, memory safety

Preferred skills

Installer/updater development, Windows internals (BITS, MSIX), open-source contributions

Technologies

C, C++, Windows, macOS, Linux, Javascript, HTML

Responsibilities

Debug and fix software defects in Firefox, contribute to new features and improvements, perform code reviews, collaborate with distributed teams, work on installer and updater maintenance

Seniority

Senior, hands-on IC

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.