Mozilla

Not-for-profit internet software organization prioritizing privacy

Contract Staff Software Engineer Firefox Layout

Systems Software EngineeringConfirmed live in the last 24 hours

Full-timeRemote in CanadaCA$131.4k - CA$217.7kRemote

About the Job

Requirements

Strong C++ skills; JavaScript and/or Rust is a plus.
Solid CSS and page-layout knowledge.
Strong debugging and optimization skills in a multithreaded codebase.
Ability to work independently and lead technically in a large, mature codebase.

Responsibilities

Own day-to-day Layout maintenance by fixing bugs and regressions, keeping tests green, and handling incoming issues.
Diagnose and fix Layout problems across Windows, macOS, Linux, and Android.
Carry out 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.

Desired Qualifications

Prior experience in web browser architecture and development.
Prior web standards experience.
Mobile web development, profiling, and debugging skills are a plus.
Proven experience using AI tools such as Claude or ChatGPT in code investigation, development, debugging, and/or testing is a plus.

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

Canada Tier 1 Locations 185045 - 217700 CAD
Canada Tier 2 Locations 131400 - 154600 CAD

About the Company

Mozilla

Not-for-profit internet software organization prioritizing privacy

Mozilla operates as a not-for-profit that builds tools to empower users and support an open internet. Its main product is Firefox, a free browser that respects user privacy and uses open standards. It earns money from partnerships, search royalties, and subscriptions like Mozilla VPN, and it reinvests this money into mission-driven projects and the Mozilla Foundation. The goal is to keep the internet open, accessible, and healthy by supporting user rights, open-source software, and internet literacy.

Company size: 1,001-5,000
Company stage: Grant
Total funding: $3.5M
Headquarters: San Francisco, CA
Founded: 1998

Recently Posted Jobs

Explore more opportunities at Mozilla

See more jobs