About the role

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

Interview prep

Walk in with sharper answers.

Use this as a quick practice sheet before you speak with the employer.

Mid

Technology & IT CSS HTML Javascript Remote Collaboration Writing Mid level

Likely questions

Tell us about work you have done that is close to the Contract Staff Front End Engineer (Web Conference/Screen Sharing) role.
How would you approach your first 30 days at Mozilla?
Which of CSS, HTML and Javascript have you used recently, and what did it help you achieve?
Describe a time you solved a problem without waiting to be told exactly what to do.
How do you handle busy days, changing priorities, or pressure at work?

Prepare before the call

A recent example that proves your experience with CSS, HTML and Javascript.
One short story with a problem, your action, and the result.
Two examples that show the strengths listed on your CV.
A clear reason why this role and company interest you.
Your availability, preferred work style, and salary expectations.

Ask them

What would success look like in the first 90 days?
What are the main problems this hire should help solve?
How does the team give feedback and measure good work?
What does a normal working week look like for this role?

Practice line

I am interested in the Contract Staff Front End Engineer (Web Conference/Screen Sharing) role because I can bring practical experience in CSS, HTML and Javascript, learn the team quickly, and contribute to the outcomes Mozilla needs from this hire.

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

About the role

Walk in with sharper answers.

Likely questions

Prepare before the call

Ask them

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