Staff Site Reliability Engineer, Tools & Systems

Remote, France

About the Position

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.

We are 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.

Responsibilities

• Design, build, deploy, and operate software and systems supporting Firefox engineering.
• Contribute to developer tooling, CI/CD, workflow automation, and AI-assisted development tools.
• Own complex technical problems end-to-end across software, cloud, and operational layers, improving reliability, performance, observability, and cost efficiency.
• Work with Firefox engineering, Cloud Engineering, IT, and other teams to solve problems that span technical and organizational boundaries.
• Use telemetry, metrics, and data analysis to investigate problems and guide engineering decisions.
• Contribute to architecture and technical strategy, identifying recurring problems and solutions that can be applied across teams.

Requirements

• Strong programming skills in languages such as Python or JavaScript/TypeScript. Experience with C++ or Rust is useful.
• Experience building and deploying and operating production systems in cloud environments, including utilizing infrastructure as code such as Terraform.
• Experience across several areas such as CI/CD, containers and orchestration, networking, databases, observability, or developer tooling.
• Experience using data, telemetry, and metrics to investigate technical problems and make decisions.
• Familiarity with modern AI-assisted development tools and an understanding of their capabilities, limitations, and appropriate use.

We Offer

• Generous performance-based bonus plans to all eligible employees
• Rich medical, dental, and vision coverage
• Generous retirement contributions with 100% immediate vesting
• Quarterly all-company wellness days
• Country specific holidays plus a day off for your birthday
• One-time home office stipend
• Annual professional development budget
• Quarterly well-being stipend
• Considerable paid parental leave
• Employee referral bonus program
• Other benefits (life/AD&D, disability, EAP, etc. - varies by country)

About Mozilla

Mozilla exists to build the Internet as a public resource accessible to all because we believe that open and free is better than closed and controlled. When you work at Mozilla, you give yourself a chance to make a difference in the lives of Web users everywhere. And you give us a chance to make a difference in your life every single day. Join us to work on the Web as the platform and help create more opportunity and innovation for everyone online.

Commitment to Diversity, Equity, Inclusion, and Belonging

Mozilla understands that valuing diverse creative practices and forms of knowledge are crucial to and enrich the company’s core mission. We encourage applications from everyone, including members of all equity-seeking communities, such as (but certainly not limited to) women, racialized and Indigenous persons, persons with disabilities, persons of all sexual orientations, gender identities, and expressions.

We are an equal opportunity employer. We do not discriminate on the basis of race, religion, gender, gender identity, color, national origin, pregnancy, ancestry, domestic partner status, disability, sexual orientation, age, genetic predisposition, medical condition, marital status, citizenship status, military or veteran status, or any other basis covered by applicable laws. Mozilla will not tolerate discrimination or harassment based on any of these characteristics or any other unlawful behavior, conduct, or purpose.

Hiring Ranges

Remote, France

€65.000 - €87.000 EUR

Req ID: R3254