53K–71K EUR / year
Senior Software Engineer, Add-Ons
BackendRemote — France
Published on 2026-09-24
These details were extracted automatically from the original listing. They may not be complete or fully up to date — it's worth checking the original job post.
About this role
Build and modernize Mozilla’s Add-ons platform, supporting extension developers and the teams that review and moderate add-ons. The role combines application development with platform reliability, CI/CD, observability, and internal developer tooling.
About the company
Mozilla builds open-source products and technologies, including Firefox, that prioritize privacy, security, and an open internet.
The team
Mozilla Add-ons (AMO), including DevHub, Reviewer tools, and automated moderation systems.
Stack
PythonDjangoMySQLReactTypeScriptGoogle CloudKubernetes
What you'll do
- Deliver features and architectural improvements across moderation pipelines, Reviewer tools, and DevHub.
- Improve CI/CD, deployment safety, observability, and production reliability.
- Establish engineering practices for code review, production readiness, incident response, and documentation.
- Build internal tools and paved paths for developing and operating services.
- Debug issues across application code, asynchronous jobs, data stores, and infrastructure.
- Collaborate with product, design, QA, reviewers, support, and community contributors; mentor peers.
What we're looking for
- Strong experience building and maintaining production applications with Python and Django.
- Experience operating production systems and improving reliability and safe delivery.
- Strong CI/CD experience, including declarative pipelines and infrastructure as code.
- Experience with automated testing, integration testing, and staged or progressive delivery.
- Understanding of observability, including metrics, logging, tracing, SLOs, and actionable alerts.
- Experience building internal tools or platforms for engineering teams.
- Ability to debug complex production issues and work across unfamiliar codebases.
- Strong technical writing, collaboration, and mentoring skills.
Nice to have
- Google Cloud and Kubernetes experience.
- Infrastructure-as-code or policy-as-code experience.
- Experience with SLOs, error budgets, chaos engineering, disaster recovery, or production readiness reviews.
- Trust and safety, automated moderation, or abuse-prevention experience.
- Open-source contributions.
Benefits
- Performance-based bonus plan.
- Medical, dental, and vision coverage.
- Retirement contributions with immediate vesting.
- Quarterly company wellness days and a birthday day off.
- Home office and professional development stipends.
- Paid parental leave.