Contract Staff Software Engineer-FireFox Layout

Mozilla (mozilla.org) · Remote Canada · First seen 2026-10-29

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Posted by Mozilla on the hiring system it uses for its careers page; applications go straight to the company.

Can I apply?

  • Remote from Canada
  • Work permit not stated
  • $185k–$218k CAD/yr
From the posting
workplace
ATS workplace type: remote
remote eligible countries
ATS location: Remote Canada; Remote
locations
ATS location: Remote Canada; Remote
salary
ATS pay range: 185045–217700 CAD per year

Job description

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

- Strong C++ (JavaScript and/or Rust a plus).

- 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

- Prior experience in web browser architecture and development.

- Prior Web standards experience.

- 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.

Hiring Ranges:

Canada Tier 1 Locations $185,045—$217,700 CAD

Canada Tier 2 Locations $131,400—$154,600 CAD

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