Why Mozilla?
Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies.
The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms.
About this team and role
addons.mozilla.org (AMO) is the foundation of the Firefox add-ons ecosystem. It’s a showcase for developers to publish and grow their extensions, and a place of discovery for millions of users who customize Firefox to make it their own. Behind the scenes are the DevHub which enables developers to manage their extensions, alongside a series of Reviewer tools and automated moderation systems.
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.
What you’ll do
- 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 code review, definition of done, production readiness, runbooks, incident response, on-call practices, and infrastructure as code.
- Create robust observability systems and data-backed insights.
- Provide peer feedback, share knowledge and help others grow.
- Improve CI/CD pipelines using declarative, pipeline-as-code approaches.
- Write clear technical documentation, including design notes, Architecture Decision Records, runbooks, and incident write-ups.
- Work within our Python/Django, MySQL, React/TypeScript, and asynchronous processing systems.
What you’ll bring
- Strong hands-on experience building and maintaining production applications with Python/Django.
- Experience operating and improving production software systems where reliability and safe delivery matter.
- Strong experience with CI/CD systems and treating pipelines and infrastructure declaratively as code.
- Strong understanding of observability as an engineering discipline, including metrics, logging, tracing, service-level objectives, and actionable alerting.
- Experience building or maintaining internal tools or platforms used by other engineering teams.
- Strong technical writing skills and collaboration in a distributed team environment.
- Commitment to Mozilla's core values: welcoming differences, being relationship-minded, practicing responsible participation, and having grit.
What you’ll get
- Generous performance-based bonus plans
- Comprehensive medical, dental, and vision coverage
- Retirement contributions with 100% immediate vesting
- Quarterly all-company wellness days
- Country-specific holidays plus a birthday day off
- One-time home office stipend
- Annual professional development budget
- Quarterly well-being stipend
- Considerable paid parental leave
- Employee referral bonus program
Timezone overlap
UTC+0–+3
Benefits
Health, Dental, Vision, Pension, PTO, Home office, Learning, Wellness, Parental leave, Bonus, Equity, Mental health, Coworking
Open to
Europe
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