Senior Product Security Engineer

Mozilla
United Kingdom
Workplace: RemoteFull timeGBP 65,000 - 87,000 annuallyFunction: CybersecurityExperience: 5+ yearsSkills: ["Collaboration","Communication","Problem-solving","Security","Systems thinking"]

Senior Software Engineer focusing on Add-ons operations for AMO, delivering major features, improving platform reliability, observability, and security. Works across DevHub, Reviewer tools, and moderation systems, collaborating with designers, PMs, QA, and community contributors to modernize architecture and ensure a trustworthy Firefox add-ons ecosystem.

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FursaFursa
Mozilla
Mozilla
5 months ago

Senior Product Security Engineer

✓ Verified Job

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

Source: Company careers pageValidated by: Fursa AI
Last checked: 4 hours agoStatus: Live

Job Summary

Senior Software Engineer focusing on Add-ons operations for AMO, delivering major features, improving platform reliability, observability, and security. Works across DevHub, Reviewer tools, and moderation systems, collaborating with designers, PMs, QA, and community contributors to modernize architecture and ensure a trustworthy Firefox add-ons ecosystem.
Location: United Kingdom
Workplace: Remote
Employment Type: Full time
Job Function: Cybersecurity

Key Responsibilities

  • •Deliver major features and architectural improvements across the Add-ons stack, including automated moderation pipelines, Reviewer tools, and DevHub.
  • •Create robust observability systems and data-backed insights.
  • •Provide peer feedback, share knowledge and help others grow.
  • •Improve platform reliability through deployments, monitoring, and incident response.
  • •Help keep the platform safe and trustworthy, with attention to security and user trust.

Pay and Benefits

Salary: GBP 65,000 - 87,000 annually
Perks:Health InsuranceDentalVisionHome OfficeWellness StipendParential LeaveAnnual Bonus

Key Requirements

  • •5+ years of software development experience, with strong backend/frontend capabilities, and a track record of shipping features in a complex platform
  • •Strong experience with Python/Django or similar backend frameworks
  • •Experience building modern web applications and understanding web security principles
  • •Excellent collaboration and communication skills in distributed teams
  • •Ability to navigate ambiguity, explore solutions, and shape direction in new problems
Experience:5+ yearsWebOpen sourceFirefox Add-onsAMO
Skills:CollaborationCommunicationProblem-solvingSecuritySystems thinking
Languages:English
Tech Stack:ReactTypeScriptDjangoMySQLGoogle CloudObservabilityMonitoringDevOps

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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