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Senior Frontend Software Engineer, Firefox

Mozilla

Salary not specified
Oct 27, 2025
Remote, US
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Mozilla Corporation is looking to expand the value and agency of their Firefox web browser by developing high impact user-facing features and capabilities.

Requirements

  • 5+ years of experience in JavaScript/TypeScript, React, Redux, and browser-based UI development

Responsibilities

  • Build high quality user interfaces and experience for Firefox with accessibility and usability in mind
  • Write code and tests, build prototypes, solve problems with no clear solution, collaborate with other designers and engineers to make the web a better place
  • Learn about a wide variety of problems and solutions across a large, mature codebase
  • Work with multi-functional teams, building relationships and nurturing collaboration to reach shared goals
  • Help to level-up the skills of your fellow engineers through code reviews, giving talks, and/or writing documentation
  • Promote and maintain high standards of code-quality, focusing on performance, testing, security, usability, accessibility and maintainability
  • Contribute to improving engineering practices and procedures

Other

  • Have a strong bias towards action, a willingness to do whatever it takes, and embody show > tell
  • Have a strong sense of agency, effectively prioritizing and unblocking yourself without much outside input
  • Value taking ownership and responsibility for your projects and systems
  • A background in shipping high quality software
  • Interest in and ability to work with a distributed team (requires good asynchronous written communication skills as well as good verbal communication skills)
  • Willingness to provide and receive constructive feedback
  • Contributions through asking questions and proposing new ideas
  • A love of working with others collaboratively
  • A keen interest in AI and bringing value of this tool to users in a privacy preserving and secure way.
  • Commitment to our values: Welcoming differences, Being relationship-minded, Practicing responsible participation, Having grit