Senior Software Engineer

What you’ll do: Deliver major features and architectural improvements across the Add-ons stack, including automated moderation pipelines, Reviewer tools, and DevHub. Create robust observability systems and data-backed insights. Provide peer feedback, share knowledge and help others grow. Improve platform reliability through deployments, monitoring, and incident response. Help keep the platform safe and trustworthy, with attention to security and user trust. Step in to resolve issues impacting users and developers, from small bugs to larger incidents. Collaborate with designers, product managers, QA, and community contributors to deliver end-to-end improvements. Contribute in the open through pull requests, code reviews, and discussions. Work on: Full stack development: React/TypeScript frontends, Django backend, MySQL datastore. Platform reliability: deployments, monitoring, and incident response on Google Cloud. Feature development: submission flows, trust and safety signals, DevHub and Reviewer tools modernization. Ecosystem moderation: abuse report management, policy compliance, and ecosystem safety. Open collaboration: We work in the open, with contributions from Mozilla staff and community members. What you’ll bring: Experience building modern web applications. Strong experience with Python/Django or similar backend frameworks. Understanding of web security principles and practices. Strong collaboration and communication skills in a distributed team environment. Adept at navigating ambiguity, exploring solutions, and shaping direction in new problem spaces. Bonus points for: Experience in building automated security systems. Exposure to cloud infrastructure (Google Cloud or similar). Contributions to open source projects. Experience with policy-compliant ecosystem moderation tools. What you’ll get: Generous performance-based bonus plans to all eligible employees - we share in our success as one team Rich medical, dental, and vision coverage Generous retirement contributions with 100% immediate vesting (regardless of whether you contribute) Quarterly all-company wellness days where everyone takes a pause together Country specific holidays plus a day off for your birthday One-time home office stipend Annual professional development budget Quarterly well-being stipend Considerable paid parental leave Employee referral bonus program Other benefits (life/AD&D, disability, EAP, etc. - varies by country) About Mozilla

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