M
United Kingdom· Remote
£51K – £225.5K/yr · Jobiba est.Estimated from 87 similar postings (medium confidence) — not stated by the employer.
● Strong current hiring demand for this role
Open for applications
Contract Staff Software Engineer-Bug Burndown
- Pay · Jobiba estimate
- £50,950–£225,500 / yearFor comparable Software Engineer roles in United Kingdom. Estimated from 87 similar postings (medium confidence) — not stated by the employer. Salary data
- Job type
- Full-time
- Work mode
- Remote
- Experience
- Senior level
About the job
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 in this ad
Department · Firefox
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The independent browser that has your back. Firefox blocks trackers, has a free built-in VPN, puts you in control of AI, and never sells your personal data.
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About this listing
- Source: Mozilla's official careers site · still listed there on 14 Nov 2026
- Posted 20 Oct 2026
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