Description review
Contract Staff Front End Engineer (Web Conference/Screen Sharing)
Mozilla · Canada · back to the listing
HR standards
63/100
needs work
Title ↔ description
84/100
solid
Reads as
Frontend Engineer
100% confident
What this role officially is
user interface developer — ESCO, the EU occupation classification
User interface developers implement, code, document and maintain the interface of a software system by using front-end development technologies.
Also known as: front end developer, UI programmer, user interface developers, UI developers, UI developer, user interface engineer
How others title the same work
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Startups
- 3Play Media | Principal Front-End Engineer (Growth) | Boston, MA | 1-day-in-office hybrid or fully remote (USA only) | Full-time | 3playmedia.com | $200–250k + bonus + equity 3Play Media
- Frontend Engineer (UI & Product-Focused) Authologic
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What the listing never says
- 18 bullet points. Long requirement lists deter qualified candidates, who read them as hard gates. Scope clarity
- No pay range published. Candidates cannot tell whether applying is worth their time. Pay transparency
- No location or timezone policy stated, so a candidate cannot tell where they may work from. Scope clarity
The listing, marked up
Nothing in the wording of this listing tripped a check. The scores above still judge how complete and coherent it is.
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
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