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

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