[Hiring] Staff Site Reliability Engineer, Tools & Systems @Mozilla

Role Description

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. We are looking for an engineer with strong software development skills and meaningful experience deploying and operating production systems.

Our 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
• Building tooling and automation that makes systems easier to operate

You will also contribute directly to the software, tools, and systems that support Firefox engineering. You will work across projects and technical domains, joining teams or existing efforts when needed and independently taking on problems that require focused ownership. We build in the open, and contributing back to the broader open-source ecosystem is an important part of the role.

Qualifications

• Strong software engineering skills
• Substantial hands-on experience deploying and operating production systems
• Strong programming skills in languages such as Python or JavaScript/TypeScript
• Experience with C++ or Rust is useful
• Experience building and deploying production systems in cloud environments
• Familiarity with 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
• Familiarity with modern AI-assisted development tools

Requirements

• You are comfortable jumping into unfamiliar systems and getting them into a sustainable state
• You enjoy moving across projects and technical domains, taking ownership of problems
• You work effectively across disciplines and can translate between software, infrastructure, and operational concerns
• You combine hands-on engineering with systems thinking and longer-term technical judgment
• You communicate openly, consistently, and respectfully
• You enjoy teaching and helping others build skills in unfamiliar technical areas

Benefits

• 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)