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