Senior Software Engineer, APZ (Asynchronous Pan & Zoom)

About this role

Develop and improve Firefox’s layout and user-interaction technologies, with a particular focus on Asynchronous Pan and Zoom (APZ). Build fast, maintainable, standards-compliant code that improves rendering and responsiveness across desktop and mobile platforms.

About the company

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

The team

Firefox Platform Layout/APZ team

Stack

What you'll do

• Develop performant, standards-compliant open-source code
• Improve layout, graphics, rendering, and user-interaction performance
• Debug and resolve issues by identifying root causes
• Participate in code reviews, team meetings, and long-term planning
• Collaborate with engineers across a distributed team

What we're looking for

• Bachelor’s degree in Computer Science or equivalent experience
• Experience developing applications in C/C++ and/or Rust
• Strong debugging and optimization skills in multithreaded environments
• Experience with memory and performance optimization tools
• Track record of completing projects spanning several months
• Strong written and verbal communication skills
• Ability to become effective quickly in a large codebase

Nice to have

• Contributions to open-source projects
• Web browser development experience

Benefits

• Performance-based bonuses
• Medical, dental, and vision coverage
• Retirement contributions with immediate vesting
• Quarterly company wellness days
• Country-specific holidays and a birthday day off
• Home office stipend
• Professional development and well-being stipends
• Paid parental leave