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Senior Contract C++ / JavaScript Software Engineer (Browser Engine)

Mozilla
Location: Belgium, Denmark, Finland, France, Netherlands, Poland Posted on: 27 October 2026
Remote
🎯 Senior🏠 Remote🧭 Backend🏢 SaaS🗣️ English
Required skills
c++javascriptqa

The role

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

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.

Required qualifications

Preferred

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