Onlano
CybersecurityRemote

Senior Security Engineer, Add-ons Operations

Mozilla - Company

UK, ๐Ÿ‡ฌ๐Ÿ‡ง United KingdomFull-time - Senior (4-7 years)0 applicantsCloses Jul 29, 2026

Salary

GBP 65,000 - 87,000 / year

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Job description

Job details

  • Location: UK
  • Work mode: Remote
  • Employment type: Full-time (Not an internship)
  • Salary: GBP 65,000 - 87,000 per year

Role overview

Mozilla is seeking a Senior Security Engineer to join the Add-ons Operations team. In this role, you will be responsible for maintaining the security integrity of the browser ecosystem, ensuring that millions of users can safely use extensions and add-ons. You will work at the intersection of security research and operational excellence to protect the open web.

Job details

This is a Full-time position based in the UK. The role offers a Remote work mode, allowing for flexibility across the region. This is a senior-level professional engagement and is not an Internship. The salary range for this position is 65,000 GBP to 87,000 GBP.

Responsibilities

  • Develop and implement security protocols for the Add-ons ecosystem to prevent malicious software distribution.
  • Conduct regular security audits and vulnerability assessments of operational infrastructure.
  • Collaborate with cross-functional teams to integrate security best practices into the development lifecycle.
  • Respond to and mitigate security incidents affecting the browser extensions platform.
  • Analyze emerging threats and develop automated tools to detect potential security risks.

Requirements

  • Proven experience as a Security Engineer or in a similar cybersecurity role.
  • Deep understanding of web security standards, browser internals, and common attack vectors.
  • Strong proficiency in scripting languages used for security automation and analysis.
  • Experience managing security operations in a large-scale, public-facing environment.
  • Ability to communicate complex security risks to both technical and non-technical stakeholders.

Benefits

  • Competitive salary range from 65,000 to 87,000 GBP.
  • Remote-first work environment providing high flexibility.
  • Opportunity to contribute to a mission-driven, non-profit backed organization.
  • Collaborative culture focused on privacy and the open web.

Keywords

CybersecurityApplication SecuritySecurity OperationsBrowser SecurityThreat ModelingIncident ResponseVulnerability Management