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

Freelanceremote5+ yrs📍 Remote Germany, 🇩🇪 Germany🗣 English

Senior contract engineer to improve Firefox Session History testing and correctness.

Enhance test coverage and code quality in Firefox's DOM Core Session History subsystem by writing Web Platform and Gecko tests, fixing issues, and collaborating through code review. Requires substantial browser-engine experience, strong C++ and JavaScript skills, and comfort with open-source development practices. This is a focused contract position supporting core Firefox infrastructure.

Tech stack
C++JavaScriptGeckoFirefox
Rate
Not stated by the agency
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Found at a specialist agency · listed 21 October 2026 · InsideJobs links you to the original posting.