Frontend Senior Software Engineer

@ Mozilla

About Mozilla

Mozilla Corporation is a non-profit-backed technology company that has shaped the internet for 25 years. Pioneering brands like Firefox have reinvented the web experience for millions worldwide. Mozilla’s mission is to create an internet built for people, not companies.

About the Team & Role

The Performance Tools team builds frameworks and tools that help engineers measure and improve performance across Mozilla products. In this role, you will work on the user interface of the Firefox Profiler, implementing interactive performance visualizations and handling large-scale data, while improving usability for engineers.

Key Responsibilities

• Design and develop modern, interactive UI components using TypeScript, React, Redux.
• Build high-performance, scalable, accessible, and maintainable user interfaces.
• Collaborate with Firefox engineers and other teams.
• Support performance efforts through bug triage and strategic initiatives.
• Mentor community volunteers and promote Firefox Profiler.

Qualifications

• 5+ years of experience in JavaScript/TypeScript, React, Redux.
• Proven ability to build complex, interactive UIs managing large data sets.
• Knowledge of profiling tools, performance tooling and testing.
• Experience with frontend testing frameworks such as Jest, React Testing Library.
• Strong communication and collaboration skills.

Benefits

• Generous performance-based bonus plans.
• Rich medical, dental, and vision coverage.
• Robust retirement contributions with immediate vesting.
• Quarterly wellness days and professional development budget.
• Paid parental leave and additional benefits.

Key skills/competency

• JavaScript
• TypeScript
• React
• Redux
• UI Development
• Performance Profiling
• Testing
• Scalability
• Collaboration
• Mentoring