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Contract Staff Software Engineer-FireFox Layout

Mozilla

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LocationCanada
SeniorityStaff / senior technical lead
CompanyMozilla
Verified recentlyChecked today
Compensation

$131k-$218k

Salary details are shown when available from the source listing. Sign in before applying so the role can be reviewed against your resume, salary goals, seniority, timezone, and location eligibility.

Requirements and working style

Decision details from the source listing

Schedule

unknown

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WFH.team analysis

What this posting tells you

Contract Staff Software Engineer maintaining Firefox’s Layout area, including CSS, page layout, APZ, text, and images. The role requires strong C++, CSS and layout knowledge, and multithreaded debugging and optimization; JavaScript or Rust is a plus. Hiring ranges are CAD 131,400–154,600 for Canada Tier 2 locations and CAD 185,045–217,700 for Tier 1 locations. Salary fields are approximate USD conversions.

Role lane

Backend, Frontend, Mobile engineering, QA and testing, Security, Software

Where you can work

Canada

Working hours

Timezone overlap is not stated.

Arrangement

Staff / senior technical lead · Contract

Required signals
C++CSSPage layoutDebugging and optimization in multithreaded codebasesIndependent technical leadership in large, mature codebases
Preferred signals
JavaScriptRustBrowser architecture and developmentWeb standardsMobile web developmentProfilingAI tools for code investigation, development, debugging, or testing
Confirm before applying
  • Required timezone overlap is not stated
Market context

Backend hiring on WFH.team

4,949active related roles
1,360new in the latest period
203.2jobs per 100 candidates
$184kmedian of comparable listed ranges

This role's listed pay is near 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 market
Skills and signals
C++CSSPage layoutDebugging and optimization in multithreaded codebasesIndependent technical leadership in large, mature codebasesJavaScriptRustBrowser architecture and developmentWeb standardsMobile web developmentProfilingAI tools for code investigation, development, debugging, or testingRemote within Canada
Job description

Contract 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

Company context

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 policy

Remote hiring signal is inferred from active confirmed-remote job listings.

Application process

Review current openings on Mozilla's official careers page before applying.

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