Senior Add-Ons Platform Engineer

Mozilla; España; Remote; EUR 70,000 - 100,000; Full time

Job summary

Mozilla Corporation is seeking a Senior Software Engineer to advance the Add-ons ecosystem (AMO) by delivering major features, modernizing DevHub, and strengthening reviewer tooling for millions of Firefox users.

You will work with engineers, reviewers, developer support and product leadership to build resilient systems, improve CI/CD, observability, and deployment reliability across Python/Django, MySQL, and React/TypeScript stacks.

Qualifications

• Proven experience building production apps with Python/Django.
• Strong CI/CD experience and infrastructure as code.
• Deep knowledge of observability, monitoring, and incident response.

Responsibilities

• Deliver major features and architectural improvements across the Add-ons stack.
• Establish and maintain engineering standards across code review, deploy readiness, and runbooks.
• Create robust observability systems and data-backed insights.
• Provide peer feedback and help others grow.
• Improve CI/CD pipelines and declarative infrastructure.

Skills

Python

Django

CI/CD

Observability

Code Review

Testing

Tools

React/TypeScript

MySQL

DevHub

IaC

Job description

Mozilla Corporation is seeking a Senior Software Engineer to advance the Add-ons ecosystem (AMO) by delivering major features, modernizing DevHub, and strengthening reviewer tooling for millions of Firefox users.

You will work with engineers, reviewers, developer support and product leadership to build resilient systems, improve CI/CD, observability, and deployment reliability across Python/Django, MySQL, and React/TypeScript stacks.