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Contract Software Engineer - DOM Core Firefox/Gecko

Mozilla · company site5 days ago

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4 · Your working hours

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Company site · found 25 Sep 2026
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Experience not statedNo degreeJavaScriptC++debuggingbrowser-engine

Full description

Shown as posted, in English

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.

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JobMozilla · company sitePosted 5 days ago

Contract Software Engineer - DOM Core Firefox/Gecko

1 · Can you apply from United States?

Not open

The ad doesn’t say — see the full posting.

4 · Your working hours

Not stated

The ad doesn’t say which hours. Ask the company.

5 · Trust

Company siteFound 25 Sep 2026
No one should ask you to pay to work.
Something wrong?Report this post

They ask for

Experience not statedNo degreeJavaScriptC++debuggingbrowser-engine

Full description

Shown as posted, in English

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.