# Contract Staff Software Engineer-Bug Burndown at Mozilla

> Remote · United Kingdom · Staff · Software engineering · open. Source: https://alderhq.app/jobs/greenhouse%3Amozilla%3A8303335 (read 2026-11-07).

## Facts (observed)

- Company: [Mozilla](https://alderhq.app/companies/mozilla)
- Location text: Remote UK; Remote Canada; Remote Denmark; Remote France; Remote Germany; Remote UK
- Where it can be done from (inferred): Remote · United Kingdom (evidence: "Location: Remote UK; Remote Canada; Remote Denmark; Remote France; Remote Germany; Remote")
- Posted: 2026-10-20 (18 days ago)
- First seen by alder: 2026-11-02 · last verified: 2026-11-04
- Reposted: 0 times · edited: 0 times
- Apply on the employer's site: https://job-boards.greenhouse.io/mozilla/jobs/8303335
- Skills listed (inferred): JavaScript, CSS

## Pay and sponsorship

- Posted pay: not posted
- Market band for similar posted roles (United Kingdom, n 33): p25 £115k, median £137k, p75 £188k

## Description (the employer's text)

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.

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Data: alder (https://alderhq.app). Cite https://alderhq.app/jobs/greenhouse%3Amozilla%3A8303335 and the date you read it. Observed facts come from the employer's own listing; location reach, level, family and skills are inferences.