Staff Site Reliability Engineer (Tools & Systems)

Join Mozilla as a Staff Site Reliability Engineer (Tools & Systems). In this broad software engineering role, you will work on internal engineering systems, developer tooling, workflow automation, and the infrastructure required to operate them. You will help teams succeed by solving difficult operational problems, establishing standards and patterns, and building tooling and automation. You will also contribute directly to the software, tools, and systems that support Firefox engineering.

• Concevoir, construire, déployer et exploiter des logiciels et des systèmes soutenant l'ingénierie de Firefox.
• Contribuer aux outils de développement, à l'automatisation des flux de travail et aux outils de développement assistés par l'IA.
• Posséder des problèmes techniques complexes de bout en bout à travers les couches logicielles, cloud et opérationnelles.

• We are looking for an experienced and versatile software engineer to work on the tools and systems that support Firefox engineering
• Experience using data, telemetry, and metrics to investigate technical problems and make decisions
• Experience across several areas such as CI/CD, containers and orchestration, networking, databases, observability, or developer tooling
• Familiarity with modern AI-assisted development tools and an understanding of their capabilities, limitations, and appropriate use
• Strong software engineering skills and substantial hands-on experience deploying and operating production systems are core requirements for this role. We do not expect you to be an expert in every technology or domain listed below
• Experience building and deploying and operating production systems in cloud environments, including utilizing infrastructure as code such as Terraform
• Strong programming skills in languages such as Python or JavaScript/TypeScript. Experience with C++ or Rust is useful
• You enjoy moving across projects and technical domains, taking ownership of problems and looking for patterns that make the next one easier to solve
• You combine hands-on engineering with systems thinking and longer-term technical judgment
• You communicate openly, consistently, and respectfully, and enjoy teaching and helping others build skills in unfamiliar technical areas
• You are comfortable jumping into unfamiliar systems and getting them into a sustainable state
• You work effectively across disciplines and can translate between software, infrastructure, and operational concerns