All vacancies
Senior Contract C++ / JavaScript Software Engineer Firefox (Browser Engine)
Mozilla
Remote · United KingdomSalary not disclosedfull-timeMozilla Careers
You will help the Firefox DOM Core team improve the health of the Session History area. You will write tests to improve the coverage; you will fix tests and/or problems to improve the Gecko correctness.
Responsibilities
- Write Web-Platform tests to improve the coverage, and Gecko mochitests as needed
- Fix the problems and pass the tests to improve the Gecko correctness
- Work through code review with the relevant Gecko module owners and iterate to landing
- Definition of done
- Improved Session History test coverage and code correctness in Gecko, measured by passed test cases, allowing the team’s senior engineers to focus on security, performance and strategic projects.
Languages
- Work format
- Remote
- Seniority
- Senior
- Posted
- 20 Oct 2026
- Last verified
- In the last 5 days
Similar roles
- Mobile Developer - IosXKTalent Inc. - Rimutee · Remote · worldwide, UTC+4 accepted
- Senior ABAP DeveloperEPAM Systems · Remote · Armenia
- Senior Node.js Software Engineer - Holepunch (100% Remote, Worldwide)Tether Operations Limited · Remote · worldwide, UTC+4 accepted
- DevRel Lead (Developer Relations)White Circle · Remote · worldwide
- SAP Logistics (SCM) Engineering ManagerEPAM Systems · Remote · Armenia
- Level 3 MSP EngineerDistantJob · Remote · worldwide not confirmed