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# Software Engineer, OS Integration

- **Company:** Mozilla Corporation
- **Location:** United States (Remote available)
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** HTML, JavaScript (Programming Language), Microsoft Windows, Abstraction Layers, Apple Mac Systems, Software Applications, C++ (Programming Language), Code Review, Software Debugging, Linux, Firefox, Human-Computer Interaction, Linux System Administration, Secure Coding, Software Engineering, Free and Open-Source Software, Web Technologies
- **Published:** November 11, 2026
- **Apply:** https://job-boards.greenhouse.io/mozilla/jobs/8367137

## About the Role

* 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.
 * Written and verbal communication skills with a collaborative mindset.
 * Willingness to work effectively in a distributed team environment.
 * Commitment to our values:

 * Play to win
 * Build for People first
 * Engage Evidence over Ego
 * Decide and Deliver
 * Ship, learn and repeat

Bonus Points for experience with:

 * Installer and/or Updater development on any OS
 * Windows internals like the BITS server or MSIX packages
 * Open-source contributions or personal engineering projects

## Description

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.
 * Collaborate with experienced software engineers.
 * Perform code reviews and provide technical direction.
 * Work with a geographically-distributed development team.
 * Interact with teams throughout the organization.