M
United Kingdom· Remote
£146.9K – £340.6K/yr · Jobiba est.Estimated from 30 similar postings (medium confidence) — not stated by the employer.
● Strong current hiring demand for this role
M
Market pay estimate
£146,875–£340,625 / year for comparable Software Engineer roles in United Kingdom. Estimated from 30 similar postings (medium confidence) — not stated by the employer.
Role overview
Job description
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.
About this listing
- Source: Mozilla's official careers site (via Greenhouse) · last confirmed on the source 29 Oct 2026
- Posted 20 Oct 2026
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Role market pulse
How Software Engineer demand looks in United Kingdom
Live jobs
139
Posted 30d
90
30d movement
+130.8%
Remote share
7.9%
Salary listed
34.5%
Salary trend 1Y
Not enough history
What they are looking for
Skills & requirements
Department · Firefox
Hiring company
Mozilla
Technology
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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