Contract Software Engineer – DOM Core, Firefox/Gecko

🕒 September 22

🌐 France, Germany, +1 more countries – Remote

🇫🇷 France – Remote 🇩🇪 Germany – Remote 🇬🇧 United Kingdom – Remote

⏳ Contract/Temporary

🟡 Mid-level

🟠 Senior

🧑‍💻 Full-stack Engineer

👻 Ghost score 10%

What it means: how likely this posting is sitting open without active hiring.How to read it: 60% or higher means we think this is a ghost. Lower scores are less of a worry.How we score it: age, reposts, open roles vs team size, how fast jobs close, and whether pay is listed.Fine print: an estimate from public data, not a judgment of the company. Real jobs can score high, so treat it as a hint, not a fact.

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Mozilla

WebsiteLinkedInAll Job Openings

501 - 1000 employees

Founded 1998

👥 B2C

🔒 Cybersecurity

B2C • Cybersecurity • Software

Mozilla is a non-profit organization dedicated to promoting an open and accessible internet. They are the makers of the popular Firefox browser, which emphasizes user privacy, speed, and control. Mozilla also offers a range of products that focus on internet security and privacy, including Mozilla VPN, Firefox Relay, and Mozilla Monitor. Additionally, the organization is involved in open-source projects, AI innovation, and advocating for digital rights. Mozilla aims to empower users with trustworthy technology and policies that protect privacy, support open-source AI development, and foster accountability for tech companies.

📋 Description

• Improve the health of the Firefox DOM Core team’s Session History area • Write Web-Platform tests to improve coverage and Gecko mochitests as needed • Fix problems and pass tests to improve Gecko correctness • Work through code review with relevant Gecko module owners and iterate to landing • Deliver improved Session History test coverage and Gecko code correctness, measured by passed test cases

🎯 Requirements

• Substantial experience in a browser-engine codebase or in automating for a browser-engine, ideally Firefox/Gecko • Solid Javascript skills applied to writing automated tests • Proficiency in and experience developing software in C++ • Strong debugging skills in a mature large codebase • Comfort working in the open: public bugs, code review, and upstream landing • Prior contributions to Gecko or another major browser engine (preferred) • Familiarity with web standards and Web Platform Tests (preferred)

🏖️ Benefits

• Contract position • Remote work in France, Germany, or the UK