Staff Site Reliability Engineer, Tools & Systems
Firefox · Remote Belgium
About this role
**Why Mozilla?** Mozilla Corporation is a 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. With more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology—helping to reclaim an internet built for people, not companies. Mozilla is wholly owned by the non-profit 501(c) Mozilla Foundation, meaning we aren’t beholden to shareholders—only to our mission. Along with thousands of volunteer contributors and collaborators worldwide, Mozillians design, build, and distribute **open-source** software that enables people to enjoy the internet on their terms. --- **About this team and role** We’re looking for an experienced and versatile software engineer to work on the **tools and systems that support Firefox engineering**. This is a broad software engineering role spanning internal engineering systems, developer tooling, workflow automation, and the infrastructure required to operate them. You’ll bring strong software development skills and meaningful experience deploying and operating production systems. Mozilla’s Cloud Engineering teams provide shared platforms and foundational services, while engineering teams own the applications and services they run on them. A key part of this role is helping teams succeed in that model by solving difficult operational problems, establishing standards and patterns, and building tooling and automation that makes systems easier to operate. We build in the open—open source is fundamental to how we work, and contributing back to the broader open-source ecosystem is an important part of the role. --- **What you’ll do** - Design, build, deploy, and operate software and systems supporting Firefox engineering. - Contribute to developer tooling, CI/CD, and workflow automation. - Help solve operational problems, establish standards and patterns, and build tooling that improves system operability. - Work across projects and technical domains, joining teams or existing efforts when needed, and taking focused ownership of problems. *(Note: The provided job description appears truncated after the “What you’ll do” section.)*
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