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Contract Staff Software Engineer-Bug Burndown

Mozilla Corporation • VPN & Proxy Services • Consumer & Utility Software • JavaScript • 9 hours ago
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Salary
≈ $117k – $193k per year (Estimated)
Location
Remote (United Kingdom)also open in Germany
Seniority
Staff
Employment
Contractor

Confirmed on the employer's own hiring board on Oct 20, 2026. First seen by Alion on Oct 20, 2026. Mozilla Corporation scores A on the Alion truth index.

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Mozilla Corporation

Mozilla Corporation is the commercial subsidiary of the non-profit Mozilla Foundation, created in 2005 to develop and distribute Firefox and related products. It is unusual in structure: profits flow back to the foundation rather than to shareholders, and the great majority of revenue has historically come from a single search default agreement, most recently with Google. Headquartered in Mountain View with a largely distributed workforce, it has been trying to reduce that dependence through advertising products, a virtual private network, the data removal service Monitor and its Anonym advertising measurement business.
mozilla.org • HQ: Mountain View, United States • VPN & Proxy Services • Consumer & Utility Software • 1001-5000 employees • Est. 2005
Tech stack of Mozilla Corporation
Backed by UpWest, Trinity Ventures, Yegor256

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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