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๐Ÿ‡ช๐Ÿ‡บ Deutschland • Permanent

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

๐Ÿข Mozillahttps://static.whatjobs.com/static/ajCore/img/jobPosting/companyLogo/whatJobs_ob_default.png ๐Ÿ“ ๐Ÿ“… 23 October 2026

Job Description

Remote Germany

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

  • 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 teamโ€™s senior engineers to focus on security, performance and strategic projects.

Required qualifications

  • Proficiency in and experience developing software in C++.
  • Strong debugging skills in a mature larget codebase.
  • Comfort working in the open: public bugs, code review, and upstream landing.

Preferred

  • Familiarity with web standards and Web Platform Tests.
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