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Contract Staff Software Engineer-Bug Burndown

Mozilla

GermanyPosted 20 Oct 2026

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About the role

You will help reduce Firefox’s WebCompat bug backlog by finishing or verifying the diagnosis of the long tail of site-breakage bugs, and by writing interventions or simple fixes (often with AI assistance). You turn a large queue of reported breakages into diagnosed, actionable, or fixed bugs.

Responsibilities

Finish diagnosing, or verify the diagnosis of, long-tail WebCompat bugs.
Write WebCompat interventions where appropriate.
Write simple fixes (AI-assisted) and land them.
Reproduce and triage incoming site-breakage reports.

Required qualifications

Solid web development (HTML, CSS, JavaScript) and comfort debugging real-world site breakage.
Fluent with browser devtools and cross-browser diagnosis.
Comfortable using AI tooling to speed up diagnosis and fixes.

Preferred

Gecko knowledge is a strong plus (but can be taught).
Prior WebCompat or web-standards experience.

Skills & tech stack

JavaScriptHTMLCSS

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