Mozilla
Contract Software Engineer - DOM Core Firefox/Gecko
Canada, UK +1
UTC-8 to UTC+1 Contract
Mid level
- Where you can live
- Remote France; Remote Germany; Remote UK
- Working hours
- Overlap with UTC-8 to UTC+1
- Salary
- Not published
- Posted
- September 22, 2026
JavaScript
C++
Summary from the posting
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.
This is a short summary. The full description, requirements and the application form are on Mozilla's own career page.