WFH.teamOpen app$131k-$218k
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What this posting tells you
Senior contract Software Engineer role at Mozilla focused on Firefox Layout maintenance and engineering. Remote work is supported but limited to Canada. Requires strong C++ and CSS expertise, debugging skills, and ability to work independently at a tech-lead level in a large codebase. Salary range provided for Canadian Tier 1 and Tier 2 locations between approximately $131,400 and $217,700 CAD.
Backend, Frontend, Mobile engineering, QA and testing, Security, Software
Canada
Timezone overlap is not stated.
senior · contract
- Required timezone overlap is not stated
Backend hiring on WFH.team
This role's listed pay is below the median among 200 comparable roles shown here. Category counts come from WFH.team's latest published remote job market snapshot.
Explore the remote job marketContract Staff Software Engineer-FireFox Layout at Mozilla
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
Working remotely at Mozilla
A lot of companies say they’re “mission-driven. ” Our unique corporate structure guarantees that every decision we make upholds our mission: to ensure the internet remains open and accessible.
- Headquarters
- United States, United Kingdom, China, Germany, France, and Canada
- Team size
- 1001-5000
- Founded
- 2005
Remote hiring signal is inferred from active confirmed-remote job listings.
Review current openings on Mozilla's official careers page before applying.