Software Engineer-Bug Burndown

Job in Toronto, Ontario, M5A, Canada

Listing for: Mozilla

Contract position
Listed on 2026-10-21

Job specializations:

Software Development
Javascript, Front End Developer, HTML CSS, Remote Software Developer

Position: Contract Staff Software Engineer-Bug Burndown

Contract Staff Software Engineer-Bug Burndown

at Mozilla Corporation Team:
Firefox Locations:
Remote Germany, Remote UK, Remote Canada

You will help reduce Firefox’s Web Compat 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 Web Compat bugs.

Write Web Compat 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 Web Compat or web-standards experience.

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