Contract Staff Software Engineer-Bug Burndown
at Mozilla Corporation

Team: Firefox

Locations: Remote Canada; Remote Germany; Remote UK

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.

Remote Canada; Remote Germany; Remote UK

Why Mozilla?
At Mozilla, we’re serving humanity—by maintaining a safe, open internet—while also helping the individual humans employed here to reach their personal and professional goals. With a relatively small team serving hundreds of millions of people,



a culture of exploration, and a commitment to mentorship, opportunities abound to learn and grow at Mozilla.

Our values drive our actions

Purpose is built into our work, with our mission driving every decision

We challenge assumptions, the status quo, ourselves, and each other

We are transparent: in our code, our business partnerships, and our everyday interactions

We seek out people from diverse backgrounds and with perspectives different from our own

We pair purpose with performance and put people ahead of profit

Our impact is global

1000+ paid staff from over 30 countries

Thousands of volunteer contributors across six continents

2 global offices: Berlin and Toronto

9 coworking space locations: San Francisco, San Mateo, London, Paris, Portland, Tulsa, Vancouver, Chicago, and Bellevue

Hundreds of home offices globally

Our benefits are world-class

Flexible work setting (majority of Mozillians work remotely)

Industry-leading paid parental leave (up to 26 weeks of fully paid leave for childbearing parents and up to 12 weeks for non-childbearing parents)

Reimbursement for professional development (up to $3,000/year)

A work setup including the latest hardware and software of your choice

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📌 Staff Software Engineer-Bug Burndown (Alberta)
🏢 Thunderbird
📍 Alberta