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Senior Software Engineer, Add-Ons
Mozilla
Remote · Netherlands€5,500–7,333 gross/mofull-timeMozilla Careers
As a Senior Software Engineer, you’ll bring a passion for crafting resilient systems that accelerate our review and moderation teams to provide a first-class experience for Add-on developers. You’ll work closely with engineers, reviewers, developer support, and Add-ons leadership to turn ideas into polished features, modernize the platform and its architecture, and see your work reach millions of people around the world.
Responsibilities
- Deliver major features and architectural improvements across the Add-ons stack, including automated moderation pipelines, Reviewer tools, and DevHub.
- Help establish and maintain engineering standards across areas such as code review, definition of done, production readiness, runbooks, incident response, on-call practices, coding conventions, and infrastructure as code.
- Create robust observability systems and data-backed insights.
- Provide peer feedback, share knowledge and help others grow.
- Build and improve the systems that enable Add-ons engineering to safely develop, deploy, observe, and operate production services.
- Improve our CI/CD pipelines using declarative, pipeline-as-code approaches that make changes reproducible, testable, and easy to review.
- Deliver work iteratively using a visible backlog, short feedback cycles, retrospectives, and demonstrations to stakeholders.
- Write clear technical documentation, including design notes, Architecture Decision Records, runbooks, and incident write-ups.
- Work effectively in unfamiliar codebases, tracing requests and asynchronous jobs end-to-end to understand failures and identify opportunities for improvement.
- Collaborate with designers, product managers, QA, and community contributors to deliver end-to-end improvements.
Languages
- Work format
- Remote
- Seniority
- Senior
- Posted
- 15 Sept 2026
- Last verified
- In the last 5 days
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