Senior Software Engineer, OS Integration

About this role

Develop and maintain Firefox features and fixes that integrate with Windows, macOS, and Linux. The role includes work on Firefox’s installer and updater, debugging OS-specific issues, and collaborating with a distributed engineering team.

About the company

Mozilla builds open-source products and technologies, including Firefox, that prioritize privacy, security, and an open internet.

The team

OS Integration team

Stack

What you'll do

• Debug and fix software defects affecting Firefox and other Mozilla products
• Develop new features and improvements, including installer and updater work
• Break down tasks and collaborate across a distributed team
• Review code and provide technical direction

What we're looking for

• 5+ years of software engineering experience
• Strong knowledge of C and C++
• Desktop application development experience with C++ on Windows, macOS, or Linux
• Knowledge of JavaScript and HTML
• Knowledge of secure coding practices and memory safety
• Strong debugging and problem-solving skills
• Clear communication and ability to work collaboratively in a distributed team

Nice to have

• Experience developing installers or updaters
• Knowledge of Windows internals, including BITS or MSIX
• Open-source contributions or personal engineering projects

Benefits

• Performance-based bonus plan
• Medical, dental, and vision coverage
• Retirement contributions with immediate vesting
• Quarterly company wellness days
• Country-specific holidays and a birthday day off
• One-time home-office stipend
• Annual professional-development budget
• Paid parental leave