Senior Security Engineer

🌐 Remote💼 Full-time💰 $68,000–$68,000🗓 2026-09-27 → 2026-09-29

Core

Build resilient systems and modernize the architecture for addons.mozilla.org (AMO), the Firefox add-ons ecosystem, to support millions of users and developers.

Role type

Senior Software Engineer - Operations (Full Stack)

Builds

Automated moderation pipelines, Reviewer tools, DevHub, and submission flows for the Firefox add-ons platform.

Domain

Internet infrastructure / Web platform operations

Deliverable

product features

Required skills

Full stack development, Python/Django, React/TypeScript, MySQL, Google Cloud, web security principles, incident response, observability

Preferred skills

Automated security systems, cloud infrastructure, open source contributions, policy-compliant ecosystem moderation

Technologies

React, TypeScript, Django, MySQL, Google Cloud

Responsibilities

Deliver major features and architectural improvements across the Add-ons stack; create robust observability systems; improve platform reliability through deployments and monitoring; resolve user and developer issues; collaborate on end-to-end improvements.

Seniority

Senior, hands-on IC

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About Mozilla

Mozilla exists to build the Internet as a public resource accessible to all because we believe that open and free is better than closed and controlled. When you work at Mozilla, you give yourself a chance to make a difference in the lives of Web users everywhere. And you give us a chance to make a difference in your life every single day. Join us to work on the Web as the platform and help create more opportunity and innovation for everyone online.