Contract Staff Front End Engineer (Web Conference/Screen Sharing)

Mozilla; Toronto; On-site; CAD 145,000 - 171,000; Full time

Job summary

Mozilla's Web Conferencing team seeks a front-end engineer on a fixed-term contract to implement Firefox screen sharing UX—screen, window, and tab capture—and ship it. You will build browser UI that remains accessible, localizable, and robust in a large codebase.

Collaborate with UX and QA to validate results, support partner testing with major conferencing services, and land changes in mozilla-central via public code reviews.

Qualifications

• 4+ years building production user interfaces with JavaScript, HTML, and CSS.
• Ability to implement an approved design faithfully and flag design gaps.
• Ability to navigate a large mature codebase you didn’t write.
• Experience writing automated tests for user interfaces.
• Strong asynchronous written communication in a distributed team.
• Comfort working in public with open Bugzilla/Phabricator processes.

Responsibilities

• Implement approved UX designs for Firefox's screen, window, and tab sharing and ship them.
• Build browser UI that is tested, accessible, and localizable in a large codebase.
• Collaborate with UX and QA to validate results.
• Support partner testing with major web conferencing services.
• Submit changes to mozilla-central through public code reviews.

Skills

JavaScript

HTML

CSS

UI development

Tools

Phabricator

Bugzilla

Mochitest

Job description

About The Team And Role

Mozilla's Web Conferencing team owns the media capture and sharing features that make Firefox work for video calls: screen, window, and tab capture, and the interface users interact with when they share content in Google Meet, Zoom, or Jitsi. We're bringing a set of screensharing improvements to Firefox. The backend work is complete and the UX has been designed and approved. We're looking for a front-end engineer on a fixed-term contract to implement it and ship it.

What You'll Do

• Implement approved UX designs for Firefox's screen, window, and tab sharing experience, and see them through to release
• Build browser UI that holds up in a large, widely used codebase: tested, accessible, and localizable
• Work with UX on the cases a design didn't anticipate, and with QA on validating the result
• Support partner testing against major web conferencing services
• Land your work in mozilla-central through public code review on Phabricator

What You'll Bring

• 4+ years building production user interfaces with JavaScript, HTML, and CSS
• Experience implementing an approved design faithfully, plus the judgment to flag it when the design meets a case it didn't anticipate
• Ability to get productive quickly in a large, mature codebase you didn't write
• Experience writing automated tests for user interfaces
• Strong asynchronous written communication, since the team is distributed across timezones
• Comfort working in public, since Bugzilla and Phabricator are open

Bonus Qualifications

• Prior contributions to Firefox or another open-source browser
• Familiarity with Firefox front-end architecture: browser/, custom elements, XUL, Fluent localization
• Experience with WebRTC or getDisplayMedia
• Accessibility experience with modal dialogs and list navigation
• Experience with Mozilla's test frameworks (browser-chrome, mochitest)
• Experience using AI tooling effectively in front-end development
• Open source environment experience

Hiring Ranges

Canada Tier 1 Locations

$145,000—$170,800 CAD

Canada Tier 2 Locations

$154,000—$168,000 USD