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Mozilla

Contract Staff Software Engineer-FireFox Layout

  • Seen live on Mozilla's site today
  • Senior
  • Remote
Pay
$185k to $218k a year CAD
Location
Remote Canada
Open for
17+ days
First seen
Oct 18, 2026
Apply on Mozilla's site (opens in a new tab)

Posting record

No flags

Open 17+ days

The posting's record, oldest first
  1. Mozilla's site dates the posting
  2. Ghostless first sees this listing
  3. Last checked: still up
How we know

It hasn't been reposted, listed twice, or left up unusually long, and the posting doesn't say it's a talent pool.

Ghostless records the day it first sees a posting, so a repost can't reset its age. This one was already up when Ghostless started tracking Mozilla, so its true age is longer.

Last checked Nov 4, 2026.

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What the posting discloses

Pay
$185k to $218k a year CAD
$185,045 — $217,700 CAD (quoted from the posting)

Not stated: Real vacancy, AI screening.

Why these three

Ontario requires postings from employers with 25 or more staff to state the pay, whether the vacancy exists, and whether AI screens applicants.

Skills mentioned

About the role

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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