Staff Site Reliability Engineer, Tools & Systems

What you'll be doing:

  • 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 cross-disciplinary problems.
  • Use telemetry, metrics, and data analysis to investigate problems and guide engineering decisions.
  • Contribute to architecture and technical strategy, identifying recurring problems and scalable solutions.

Requirements:

  • Strong programming skills in Python or JavaScript/TypeScript; experience with C++ or Rust is a plus.
  • Experience building, deploying, and operating production systems in cloud environments, including infrastructure as code tools like Terraform.
  • Knowledge across areas such as CI/CD, containers and orchestration, networking, databases, observability, or developer tooling.
  • Experience leveraging data, telemetry, and metrics to troubleshoot technical problems and inform decisions.
  • Familiarity with modern AI-assisted development tools and understanding their capabilities and limitations.

Nice to haves:

  • Comfortable with quickly learning and managing unfamiliar systems.
  • Enjoy moving across diverse projects and taking ownership of complex problems.
  • Ability to work effectively across disciplines, translating between software, infrastructure, and operational concerns.
  • Combines hands-on engineering with systems thinking and long-term technical judgment.
  • Open, consistent, and respectful communication style; enjoys mentoring others in technical areas.

Perks and benefits:

  • Generous performance-based bonus plans for eligible employees.
  • Comprehensive medical, dental, and vision coverage.
  • Generous immediate-vesting retirement contributions, regardless of personal contribution.
  • Quarterly all-company wellness days and additional country-specific holidays plus birthday off.
  • One-time home office stipend and annual professional development budget.
  • Quarterly well-being stipend and considerable paid parental leave.
  • Employee referral bonus program and other benefits such as life/AD&D, disability, and EAP (varies by country).
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