Real job — pulled straight from Mozilla’s careers page · Verified October 27, 2026 · No reposts.
Job description
Mozilla is hiring a Staff Software Engineer — a contract, remote role. Apply directly on Mozilla's careers page below.
Contract Staff Software Engineer-Bug Burndown
Location: Remote UK
Department: Firefox
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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Frequently asked questions
Is Staff Software Engineer at Mozilla a remote job?
Yes, Staff Software Engineer at Mozilla is a remote position. This role is open to remote candidates.
What skills are required for Staff Software Engineer at Mozilla?
The required skills for Staff Software Engineer at Mozilla include: HTML, CSS, JavaScript, AI.
What is the seniority level for Staff Software Engineer at Mozilla?
Staff Software Engineer at Mozilla is a Staff level position.
How do I apply for Staff Software Engineer at Mozilla?
You can view the full description and apply for Staff Software Engineer at Mozilla on EchoJobs: https://echojobs.io/job/mozilla-contract-staff-software-engineer-bug-burndown-wjfh8.