Staff Site Reliability Engineer, Tools & Systems

Mozilla

. Design, build, deploy, and operate software and systems supporting Firefox engineering .

Posted 10/22/2026full-timeRemote • BelgiumLead💰 €72,000 - €96,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates strong software engineering skills with substantial experience in deploying and operating production systems, utilizing programming languages such as Python and JavaScript/TypeScript. Proficient in cloud environments, infrastructure as code, and leveraging data analysis for technical problem-solving.

Highest-signal resume keywords

Software Engineering SkillsPython ProgrammingJavaScript/TypeScript ProgrammingInfrastructure As Code (Terraform)Cloud Environments Experience

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Software EngineeringProduction Systems DeploymentData AnalysisTelemetryMetrics UtilizationCI/CDContainersOrchestrationNetworkingDatabases

Soft Skills

Problem-SolvingCollaborationOwnership

Tools & Technologies

TerraformAI-Assisted Development Tools

Industry Keywords

Open-Source EcosystemObservabilityWorkflow Automation

Tech Stack

Tools & technologies

CloudJavaScriptPythonRustTerraformTypeScriptC++

About the role

Key responsibilities & impact

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 spanning 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 applicable across teams
Join teams or existing efforts when needed and independently take on problems requiring focused ownership
Contribute back to the broader open-source ecosystem

Requirements

What you’ll need

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 with C++ or Rust is useful
Experience building, deploying, and operating production systems in cloud environments
Experience 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 understanding of their capabilities, limitations, and appropriate use

Benefits

Comp & perks

Generous performance-based bonus plans to all eligible employees - we share in our success as one team
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)