Senior Software Engineer, Web Layout & APZ (Open Source)

Mozilla; New York (NY); Remote; USD 120,000 - 190,000; Full time

Benefits offered by this job

Health and vision benefits

Mental health support

Paid time off and holidays

Parental leave (universal)

Job summary

Mozilla, the team behind Firefox, is seeking engineers to advance the Platform Layout/APZ stack. You will work on cross-platform rendering, animations, and layout systems in a globally distributed, remote setting.

Responsibilities include designing high-quality, standards-compliant code, contributing to open source projects, and optimizing memory and performance across multi-threaded browsers. Collaboration and code reviews are core to this role.

Qualifications

• Bachelor's degree or equivalent in CS or related field.
• Experience with C/C++ and/or Rust.
• Contributions to open source projects or browser-related work.
• Strong memory and performance optimization skills.
• Ability to work on large codebases in a multi-threaded environment.

Responsibilities

• Design and develop layout/rendering features with APZ focus.
• Write high-quality, performant open source code for the Firefox engine.
• Develop innovative layout, graphics, and interaction techniques to maximize rendering quality and performance.
• Participate in code reviews, team meetings, and long-term planning.
• Triage and test bugs; drill down to root causes and explore solutions.

Skills

C/C++ development

Rust development

Open source contribution

Multithreading

Performance optimization

Debugging

Communication

Education

Bachelor's degree in Computer Science or related field

Tools

Memory profiling

Performance profiling

Job description

Mozilla, the team behind Firefox, is seeking engineers to advance the Platform Layout/APZ stack. You will work on cross-platform rendering, animations, and layout systems in a globally distributed, remote setting.

Responsibilities include designing high-quality, standards-compliant code, contributing to open source projects, and optimizing memory and performance across multi-threaded browsers. Collaboration and code reviews are core to this role.