Contract Staff Software Engineer-FireFox Layout Team: Firefox Locations: Remote Canada
You will take on the ongoing maintenance and routine engineering work in Firefox’s Layout area (CSS, page layout, APZ, text, images). Working independently at a tech-lead level, you keep the Layout code healthy.
Responsibilities Own day-to-day Layout maintenance: fix bugs and regressions, keep tests green, handle incoming issues.
Diagnose and fix Layout problems across platforms (Windows, macOS, Linux, Android).
Carry code review and routine upkeep so the FTE engineers can focus on other mission critical projects. .
Join planning and standards / web-compat meetings as needed.
Definition of done
A healthy Layout area, backlog and regressions kept down, with the team’s senior engineers freed to focus on critical Performance and Security issues.
Required qualifications
Solid CSS and page-layout knowledge.
Strong debugging and optimization in a multithreaded codebase.
Able to work independently and lead technically in a large, mature codebase.
Preferred Mobile web development, profiling and debugging skills a plus .
Proven experience in utilization of AI tools (Claude, ChatGPT, etc.) in the investigation, development, debugging, and/or testing of code is a plus.
At Mozilla, we’re serving humanity—by maintaining a safe,



open internet—while alsohelping the individual humans employed here to reach their personal andprofessional goals. With a relatively small team serving hundreds of millions ofpeople, a culture of exploration, and a commitment to mentorship, opportunitiesabound to learn and grow at Mozilla.
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 everydayinteractions
We seek out people from diverse backgrounds and with perspectives differentfrom 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 advantages are world-class Flexible work environment (majority of Mozillians work remotely)
Industry-leading paid parental leave (up to 26 weeks of fully paid leave forchildbearing 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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📌 Contract Staff Software Engineer-FireFox Layout (Manitoba)
🏢 Mozilla
📍 Manitoba