Senior Software Engineer — Add-ons Platform (Remote)

Mozilla Corporation; Finland; Remote; EUR 90,000 - 130,000; Full time

Benefits offered by this job

Generous bonus plans

Medical/dental/vision coverage

Retirement contributions

Home office stipend

Professional development budget

Paid parental leave

Employee referral program

Job summary

Mozilla Corporation seeks a Senior Software Engineer for addons.mozilla.org (AMO). You will deliver major features across the Add-ons stack, modernize DevHub and reviewer tools, and build robust observability and deployment pipelines.

You will collaborate with engineers, reviewers, developer support, and leadership to ship reliable software that serves millions of users globally. Remote Finland opportunities are available, with a focus on platform reliability and scalable architecture.

Qualifications

• 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.
• Experience designing or improving automated testing and deployment workflows, including integration testing and staged or progressive delivery.
• 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, with an understanding that internal systems have users, reliability expectations, roadmaps, and lifecycle considerations.
• Experience defining or improving engineering practices such as code review standards, operational readiness, runbooks, incident response, on-call expectations, or definitions of done.

Responsibilities

• Deliver major features and architectural improvements across the Add-ons stack, including automated moderation pipelines, Reviewer tools, and DevHub.
• 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.
• Build and improve the systems that enable Add-ons engineering to safely develop, deploy, observe, and operate production services.
• Improve 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.
• Contribute in the open through pull requests, code reviews, and discussions.
• Work on: Feature development, AMO application systems (Python/Django, MySQL, React/TypeScript), internal developer platforms, team process, engineering standards, platform reliability.

Skills

Python

Django

CI/CD

Observability

Distributed systems

Code review

Incident response

Production debugging

Technical writing

Mentoring

Team collaboration

Tools

Google Cloud

Kubernetes

React/TypeScript

MySQL

CI/CD tooling

Job description

Mozilla Corporation seeks a Senior Software Engineer for addons.mozilla.org (AMO). You will deliver major features across the Add-ons stack, modernize DevHub and reviewer tools, and build robust observability and deployment pipelines.

You will collaborate with engineers, reviewers, developer support, and leadership to ship reliable software that serves millions of users globally. Remote Finland opportunities are available, with a focus on platform reliability and scalable architecture.