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Contract Staff Software Engineer-Bug Burndown

Mozilla

Remote United Kingdom / Remote - UK

Employer posted: October 20, 2026. Source checked: October 20, 2026 7:56 pm. Availability and final application requirements are confirmed on the employer’s site.

Source: Mozilla — company careers. WorkerEra lists this opportunity from an external source; confirm current details with the employer.

About this opportunity

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.

 

Imported source listing. Details are supplied by the source and have not been independently verified by WorkerEra. Confirm the current vacancy on the employer’s page.

Source: Mozilla — company careers

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  • Read the linked employer announcement and compare its requirements with your experience.
  • Tailor your CV to responsibilities and skills actually listed by the employer.
  • Confirm the work location, deadline and application documents before submitting.
  • Salary was not supplied in the listing fields; ask the employer about compensation.

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