Senior Software Engineer, Add-Ons

Mozilla
United Kingdom, Canada
Workplace: RemoteFull timeGBP 66,000 - 87,000Function: Software EngineeringSkills: ["Collaboration","Communication","Technical writing","Peer feedback","Mentorship"]

Build and modernize the Add-ons ecosystem for Firefox, delivering major features and architectural improvements across moderation pipelines, Reviewer tools, and the DevHub. Partner with engineering, reviewers, developer support, and leadership to improve reliability, observability, and CI/CD using declarative pipeline-as-code. Help establish engineering standards, write operational documentation (ADRs, runbooks, incident reports), and ship iterative improvements that reach millions of users.

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FursaFursa
Mozilla
Mozilla
16 hours ago

Senior Software Engineer, Add-Ons

✓ Verified Job

Canonical indexed version, validated from employer's careers page.

Source: Company careers pageValidated by: Fursa AI
Last checked: 1 hour agoStatus: Live

Job Summary

Build and modernize the Add-ons ecosystem for Firefox, delivering major features and architectural improvements across moderation pipelines, Reviewer tools, and the DevHub. Partner with engineering, reviewers, developer support, and leadership to improve reliability, observability, and CI/CD using declarative pipeline-as-code. Help establish engineering standards, write operational documentation (ADRs, runbooks, incident reports), and ship iterative improvements that reach millions of users.
Location: United Kingdom, Canada
Workplace: Remote
Employment Type: Full time
Job Function: Software Engineering
Seniority: Mid level

Key Responsibilities

  • •Deliver major features and architectural improvements across the Add-ons stack, including automated moderation pipelines, Reviewer tools, and DevHub.
  • •Improve engineering standards for production readiness, testing, recoverability, documentation, safe deployment, and operational practices.
  • •Create and evolve observability systems and data-backed insights; participate in incident response and on-call practices.
  • •Improve CI/CD pipelines using declarative pipeline-as-code approaches and ensure changes are reproducible, testable, and reviewable.
  • •Write clear technical documentation (design notes, Architecture Decision Records, runbooks, and incident write-ups) and contribute via PRs and code reviews.

Pay and Benefits

Salary: GBP 66,000 - 87,000
Perks:Health InsuranceDentalVisionHome OfficeLearning BudgetPaid ParentalWell-being Stipend

Key Requirements

  • •Strong hands-on experience building and maintaining production applications with Python/Django.
  • •Experience operating and improving production systems where reliability and safe delivery matter.
  • •Strong experience with CI/CD and treating pipelines/infrastructure declaratively as code.
  • •Experience with automated testing and deployment workflows (e.g., integration testing, staged or progressive delivery).
  • •Strong understanding of observability (metrics, logging, tracing, SLOs) with actionable alerting.
Skills:CollaborationCommunicationTechnical writingPeer feedbackMentorship
Tech Stack:PythonDjangoMySQLReactTypeScriptCI/CDObservabilityMetricsLoggingTracingService-level objectives (SLOs)KubernetesInfrastructure-as-codePolicy-as-codePipeline-as-codeIncident responseFrontendBackendAsynchronous processing

Company Brief

Mozilla
Mozilla is a mission-driven organization that builds open-source internet products (notably the Firefox browser) and advocates for an open, private, and secure web through software, research, and community programs.
Industry: Enterprise Software
Company Size: Large (251 to 1,000 employees)
Growth: Nonprofit & NGO
Headquarters: San Francisco, United States
Founded: 1998
Glassdoor
Glassdoor: 2.9
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