Senior Software Engineer

Description:

The Localization Team manages the infrastructure that powers localization across all Mozilla products and services, and supports our global community of volunteer localizers. As a Senior Engineer, you’ll contribute to a range of Mozilla localization projects and technologies — from open source libraries like moz-l10n to Pontoon, our Django-based Translation Management System. You’ll also work on internationalization features that shape the experience of Firefox and other Mozilla products, and have the opportunity to engage with development of standards such as Unicode MessageFormat and DOM Localization.

You’ll contribute to architectural discussions and help drive feature development within the team. At Mozilla, Senior Engineers are expected to work independently on well-defined projects, collaborate closely with peers, and play a key role in delivering high-quality software that advances the team’s goals and Mozilla’s mission.

What You’ll Do

• Contribute to the development of Python and JavaScript libraries (such as moz-l10n) and tools that support Mozilla’s localization infrastructure.
• Improve localization and internationalization within the Firefox codebase to make features more adaptable and accessible across languages and regions.
• Collaborate with engineers and program managers to design and implement new Pontoon features.
• Engage with our community of volunteer developers and localizers to support and guide Mozilla’s localization efforts.
• Collaborate effectively with teammates and internal clients across regions and time zones.

What You’ll Bring

• Strong experience developing and maintaining libraries and tools using Python and JavaScript.
• Solid understanding of web technologies, APIs, and modern development workflows.
• Experience with open source development practices and community collaboration.
• Ability to collaborate effectively in a distributed team, across time zones and disciplines.
• Excellent communication skills, with an emphasis on clarity and working across technical and non-technical roles.
• Professional fluency in English (written and verbal).
• Commitment to our values:
  • Welcoming differences
  • Being relationship-minded
  • Practicing responsible participation
  • Having grit