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Frontend Senior Software Engineer

Mozilla

HybridHybrid

Original Job Summary

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

How to Get Hired at Mozilla

🎯 Tips for Getting Hired

  • Research Mozilla's culture: Study their mission, values, and impact.
  • Tailor your resume: Highlight TypeScript, React, Redux expertise.
  • Customize your cover letter: Match job requirements exactly.
  • Prepare for interviews: Review performance and UI design projects.

📝 Interview Preparation Advice

Technical Preparation

Review TypeScript and React best practices.
Practice building interactive, data-intensive UIs.
Study Redux state management patterns.
Familiarize with browser performance profiling tools.

Behavioral Questions

Demonstrate collaboration in multi-team settings.
Explain past mentoring experiences clearly.
Discuss handling complex project challenges.
Describe effective communication strategies.