Senior Software Engineer, OS Integration
At Mozilla
Posted 9 Nov 2026 · Application link last checked 15 Nov 2026
Who Can Apply
This role is open to people based in Canada — Remote Canada. If you live somewhere else, you probably can't be hired for it unless the posting says otherwise.
Also Open In
The employer lists this role separately for 8 other locations. Each has its own eligibility and application page.
Role Overview
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. This might include integration with a new OS feature or fixing an OS-specific user interface 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 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 improvements.
- Break down tasks and work with others to deliver solutions.
This excerpt leaves out Mozilla's standard introduction and stops part-way through the role description. Read the full job description on Mozilla's site ›
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