Senior Software Engineer, Add-Ons

• Join Mozilla’s Firefox Add-ons team as a Senior Software Engineer, working fully remotely from the UK or Europe. • Work on addons.mozilla.org (AMO), the foundation of the Firefox add-ons ecosystem used by millions. • Build resilient systems that help review and operations teams give add-on developers a first-class experience. • Deliver major features and architectural improvements across moderation pipelines, Reviewer tools and DevHub. • Help keep the platform safe and trustworthy through security and ecosystem moderation work. • Work in the open alongside Mozilla staff and community contributors.

• Bring experience building modern web applications. • Show strong experience with Python/Django or similar backend frameworks. • Understand web security principles and practices. • Collaborate and communicate well in a distributed team. • Navigate ambiguity, explore solutions and shape direction in new problem spaces. • Commit to Mozilla’s values of welcoming differences, responsible participation and grit.

• Bring experience building automated security systems. • Show exposure to cloud infrastructure such as Google Cloud. • Bring contributions to open-source projects. • Show experience with policy-compliant ecosystem moderation tools.

• Deliver major features and architectural improvements across the Add-ons stack. • Build full-stack features with React/TypeScript, Django and MySQL. • Create robust observability systems and data-backed insights. • Improve platform reliability through deployments, monitoring and incident response on Google Cloud. • Build submission flows, trust and safety signals, and modernise DevHub and Reviewer tools. • Support ecosystem moderation, including abuse reports and policy compliance. • Resolve issues affecting users and developers, from small bugs to larger incidents. • Give peer feedback, share knowledge and contribute openly through pull requests and code reviews.

• Earn a generous performance-based bonus. • Get up to 26 weeks of fully paid parental leave for childbearing parents and 12 weeks for non-childbearing parents. • Receive rich medical, dental and vision coverage and generous retirement contributions with immediate vesting. • Enjoy quarterly all-company wellness days and a day off for your birthday. • Use up to $3,000 a year for professional development and a quarterly well-being stipend. • Get a one-time home office stipend and the latest hardware and software of your choice.

Mozilla Corporation is the non-profit-backed technology company behind Firefox, the privacy-minded web browser used by more than 225 million people each month. It is wholly owned by the non-profit Mozilla Foundation, so it answers to its mission rather than shareholders. Mozilla builds open-source software with over 1,000 staff in 30+ countries and thousands of volunteer contributors.