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

Experience

Experience not stated

Salary

Salary not stated

Who can apply

Restricted: Germany

Source wording: “Germany”

Published

Published 21 Oct 2026 · 4 days ago

Work authorization

Not stated — confirm with employer

Residency

Not stated

Sponsorship

Not stated

Time-zone requirements

Not stated

First seen here

24 Oct 2026

Source

Jobicy · Imported · Confirm current details with the original source

Source listing ID

156178

Original listing

https://jobicy.com/jobs/156178-senior-contract-c-javascript-software-engineer-firefox-browser-engine

Last imported

25 Oct 2026

About the role

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 team’s senior engineers to focus on security, performance and strategic projects. Required qualifications Substantial experience in a browser-engine codebase or in automating for a browser-engine, ideally Firefox/Gecko. Solid Javascript and applying that language skill to write automated tests. 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 Prior contributions to Gecko or another major browser engine. Familiarity with web standards and Web Platform Tests.

Skills

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