All vacancies
Senior Software Engineer, Firefox Security
Mozilla
Remote · Finland€3,750–5,000 gross/mofull-timeMozilla Careers
Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years.
Responsibilities
- Design, build and implement security and hardening features for enterprise users
- Design, implement, test, and ship cutting-edge security features that strengthen Firefox’s security posture.
- Advance Firefox’s security architecture across multiple operating systems
- Contribute to and drive cutting-edge improvements to Firefox’s core security posture, by building privilege isolation and moving trust boundaries or Strengthen Firefox’s security architecture: Improve Firefox’s core security mechanisms including cryptographic protocols, WebPKI, and security-sensitive web APIs.
- Contribute to our security initiatives: Work across teams to investigate security issues, identify root causes, and deliver robust, maintainable fixes.
- Improve browser reliability and performance: Diagnose and resolve issues affecting stability, correctness, performance, and memory usage in a complex, multithreaded environment.
Languages
- Work format
- Remote
- Seniority
- Senior
- Posted
- 14 Oct 2026
- Last verified
- In the last 5 days
Similar roles
- 1C developerAras Food LLC · Armenia · On-site
- Go (Golang) Software Engineer, Developer Tooling and ContainersCanonical · Remote · worldwide not confirmed
- Software Engineer - L3 SupportCanonical · Remote · worldwide
- Senior Drupal Developer - short time contract - remote from EUAlmavivA de Belgique · Remote · worldwide, UTC+4 accepted
- Senior Backend EngineerSurfe · Remote · worldwide, UTC+4 accepted
- Cloud Engineer AWS ( CDK / Serverless) ( 102-09SENG-01 )OpsBrasil Serviços Cloud LTDA · Remote · worldwide, UTC+4 accepted
