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

Devconnectplatform; Canada; Hybrid; CAD 145,000 - 171,000; Full time

Job summary

Mozilla is seeking a Contract Staff Front End Engineer to implement screen, window, and tab sharing UX for Firefox, in a remote Canada-based team. You will translate approved designs into production UI, ensuring accessibility, localization, and testability within a large codebase.

You will collaborate with UX, QA, and partners testing against major conferencing services, and land changes in mozilla-central through Phabricator reviews.

Qualifications

• 4+ years building production UIs with JavaScript, HTML, and CSS.
• Experience writing automated UI tests.
• Strong asynchronous written communication in distributed teams.

Responsibilities

• Implement approved UX designs for Firefox's screen, window, and tab sharing.
• Build accessible, testable browser UI in a large codebase.
• Collaborate with QA and UX; support testing with partners.

Skills

JavaScript

HTML/CSS

UI testing

Accessibility

Open source

Tools

Phabricator

Bugzilla

Mochitest

browser-chrome

Job description

# Contract Staff Front End Engineer (Web Conference/Screen Sharing)Mozilla145k–171k CADContractremote· leadCanadajavascriptListed via Jobicy · posted 24 Sept 2026. The application happens there, not on DevConnect.Apply on Jobicy## DescriptionAbout the team and roleMozilla'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 PhabricatorWhat 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 openBonus 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 experienceHiring Ranges:Canada Tier 1 Locations$145,000—$170,800 CADCanada Tier 2 Locations$154,000—$168,000 USD