Staff Site Reliability Engineer, Tools & Systems

About this role

Build and operate software, developer tooling, and systems that support Firefox engineering. The role combines hands-on software development with production operations, solving cross-team reliability challenges and improving engineering workflows.

About the company

Mozilla builds open-source products and technologies, including Firefox, that prioritize privacy, security, and an open internet.

Stack

What you'll do

• Design, build, deploy, and operate systems supporting Firefox engineering
• Develop and improve developer tooling, CI/CD, workflow automation, and AI-assisted development tools
• Improve system reliability, performance, observability, and cost efficiency
• Use telemetry and metrics to investigate issues and guide decisions
• Collaborate across engineering, cloud, and IT teams on operational challenges
• Contribute to architecture, technical strategy, and open-source projects

What we're looking for

• Strong software engineering and programming skills
• Substantial experience deploying and operating production systems in cloud environments
• Experience with infrastructure as code, such as Terraform
• Experience in several areas including CI/CD, containers, orchestration, networking, databases, observability, or developer tooling
• Use data, telemetry, and metrics to investigate technical problems
• Familiarity with AI-assisted development tools and their appropriate use

Nice to have

• Experience with C++ or Rust

Benefits

• Performance-based bonus plan
• Medical, dental, and vision coverage
• Retirement contributions with immediate vesting
• Quarterly company wellness days
• Country-specific holidays and a birthday day off
• Home office stipend
• Professional development and well-being stipends
• Paid parental leave