Staff Site Reliability Engineer, Tools & Systems
Level inferred from job title
Job description
An experienced software engineer role supporting Firefox engineering by building and operating internal engineering systems, developer tooling, workflow automation, and the infrastructure behind them. The engineer works across projects and technical domains, solving operational problems and establishing standards and patterns.
At a glance
- Employment
- Full-time · Employee (employment agreement)
- Work mode
- Remote · France
- Pay
- EUR 65,000 – 87,000 / year
What you'll do
- 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.
What we're looking for
- Strong software engineering skills and substantial hands-on experience deploying and operating production systems.
- Strong programming skills in languages such as Python or JavaScript/TypeScript.
- Experience building, 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.
- Comfortable jumping into unfamiliar systems and getting them into a sustainable state.
- Enjoys moving across projects and technical domains, taking ownership of problems and looking for patterns that make the next one easier to solve.
- Works effectively across disciplines and can translate between software, infrastructure, and operational concerns.
- Combines hands-on engineering with systems thinking and longer-term technical judgment.
- Communicates openly, consistently, and respectfully, and enjoys teaching and helping others build skills in unfamiliar technical areas.
Nice to have
- Experience with C++ or Rust is useful.
Your team
Firefox engineering support
A broad software engineering role spanning internal engineering systems, developer tooling, workflow automation, and the infrastructure required to operate them; works with Firefox engineering, Cloud Engineering, IT, and other teams.
Benefits
- Generous performance-based bonus plans to all eligible employees
- Rich medical, dental, and vision coverage
- Generous retirement contributions with 100% immediate vesting (regardless of whether you contribute)
- Quarterly all-company wellness days where everyone takes a pause together
- 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)
Apply
Direct apply at mozilla
Opens the job posting at mozilla
About Mozilla Corporation
The non-profit-backed technology company that has shaped the internet for the better over the last 25 years
Mozilla Corporation is the non-profit-backed technology company behind brands like Firefox, the privacy-minded web browser. With more than 225 million people around the world using its products each month, Mozilla focuses on diverse areas including AI, social media, security and more. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation, so it isn't beholden to any shareholders — only to its mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms.
Mission
To make the internet better for people and build the Internet as a public resource accessible to all because open and free is better than closed and controlled.
Key facts
- Technology
- More than 225 million people around the world use Mozilla products each month
- Wholly owned by the non-profit 501(c) Mozilla Foundation
- Not beholden to any shareholders — only to its mission
- Builds in the open; open source is fundamental to how it works
What they value
- Open and free is better than closed and controlled
- Valuing diverse creative practices and forms of knowledge
- Diversity, equity, inclusion, and belonging
- Communicate openly, consistently, and respectfully