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, cross-platform improvements, debugging, code review, and technical collaboration.

About the company

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

The team

Mozilla’s OS Integration team, responsible for Firefox’s integration with host operating systems and environments.

Stack

What you'll do

• Debug and fix defects to improve Firefox quality and user experience
• Develop new features and improvements, including cross-platform work
• Maintain and develop Firefox’s installer and updater
• Break down work and collaborate with distributed teams
• 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 on Windows, macOS, or Linux with C++
• Knowledge of JavaScript and HTML
• Knowledge of secure coding practices and memory safety
• Strong problem-solving, debugging, communication, and collaboration skills

Nice to have

• Installer or updater development experience
• Windows internals experience, 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