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Software Engineering
Mozilla
Mozilla is hiring a Senior Software Engineer for the Firefox add-ons ecosystem, specifically the addons.mozilla.org (AMO) platform that serves millions of users, extension developers and the review team. The same requisition is posted as separate remote rows for Germany, the United Kingdom, France, Spain, the Netherlands, Belgium, Finland, Sweden and Canada, so it is hireable from any of those nine countries with a country-specific salary band (for example EUR 68,000 to 91,000 for Germany and SEK 512,925 to 683,900 for Sweden). You will deliver major features across the automated moderation pipeline, reviewer tools and DevHub, set engineering standards, build observability and CI/CD infrastructure, and mentor peers on a distributed team. The European rows were first published on Mozilla's Greenhouse board on 15 September 2026; the Canada row is an older requisition id refreshed the same day. The apply link goes to the Germany row; switch to your country's row on the Mozilla careers page before applying.
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Deliver major features and architectural improvements across the Firefox add-ons platform including automated moderation pipelines, reviewer tools and DevHub. Establish engineering standards and create observability systems for metrics, logging, tracing and alerting. Improve CI/CD pipelines using infrastructure-as-code approaches. Own production reliability, incident response and runbooks. Write design notes, runbooks and incident reports. Mentor peers and collaborate with design, product, QA and community contributors.
Strong hands-on experience building and maintaining production applications with Python and Django. Expertise with CI/CD systems and declarative pipelines. Strong understanding of observability as an engineering discipline. Ability to debug complex production issues end to end. Strong technical writing and communication skills. Experience building internal tools and platforms for engineering teams. Bonus: Google Cloud, Kubernetes, infrastructure-as-code, SLOs, chaos engineering, trust and safety systems, open-source contributions.
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EUR 52K - 128K/yr
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