Contract Front End Engineer to implement approved UX designs for Firefox's screen, window, and tab sharing experience. Work involves building tested, accessible, and localizable browser UI, writing automated UI tests, collaborating with UX and QA, supporting partner testing with major web conferencing services, and landing changes in mozilla-central via public Phabricator reviews. Requires 4+ years of production UI experience with JavaScript/HTML/CSS and comfort working in open-source/public workflows.

Work on the WebCompat team's internal tooling by building and improving dashboards (triage, reporting, metrics) and improving the broken-site-report screenshot capture and pipeline. Collaborate with the WebCompat team (including QA) to convert reporting and triage needs into reliable tooling. Required skills include web development (JavaScript, HTML, CSS), Python and Django, dashboard/data view experience, and comfort with tooling, automation, and web services. Familiarity with Bugzilla, screenshot/automation pipelines, and machine learning are listed as preferred.

MZLA (Thunderbird) seeks a Staff Designer focused on rapid prototyping and design-to-code execution for Thunderbolt, an open-source AI client. The role combines product & interaction design with front-end engineering to create prototypes, reusable patterns, and production-quality UI—emphasizing accessibility, usability, security, and enterprise needs. Remote in Canada; 10+ years of relevant experience and strong JavaScript/TypeScript and component-based framework skills required. Salary range: CAD 155,000–175,000. Visa sponsorship is not provided.

Join MZLA/Thunderbird as a Staff Design Engineer focused on rapid prototyping and production-quality front-end work for Thunderbolt, an open-source AI client. Responsibilities include building prototypes in the codebase, defining interaction patterns for AI-powered features, improving usability/accessibility, and contributing reusable components and design-system elements. Role is fully remote (US only), requires 10+ years of relevant experience, and the posted US salary range is $185,000–$205,000 USD per year; visa sponsorship is not provided.

Lead a geographically distributed frontend engineering team responsible for Firefox Desktop (Windows, Linux, macOS). Requires 4+ years leading engineers, hands-on web technology experience (JavaScript/TypeScript, HTML, CSS), experience with frontend platform initiatives (design systems, architecture), and delivering user-facing products while collaborating with Product, UX, QA, Operations, and Data Science. Remote (US) role with listed US salary ranges.

The Front End Engineering Manager will direct a geographically distributed team to deliver and maintain the Firefox Desktop user interface. Requires 4+ years leading engineers, a software engineering background, hands-on experience with web technologies and frontend platform initiatives (e.g., design systems), and experience delivering user-facing frontend experiences while working cross-functionally with Product, UX, QA, Operations, and Data Science.

MZLA/Mozilla is hiring a remote Staff Designer (design engineering / UX engineering) to create functional prototypes and production front-end experiences for Thunderbolt. The role requires 10+ years' relevant experience, strong JavaScript/TypeScript and component-based front-end skills, experience with AI-enabled product experiences, and expertise in usability, accessibility, and enterprise considerations. The position is full-time, permanent, and open to candidates in the US and Canada; visa sponsorship is not provided.

Lead a geographically distributed frontend engineering team for Firefox Desktop (Windows, Linux, macOS). Own delivery, engineering processes, hiring and development; collaborate with Product, UX, QA, Operations and Data Science. Requires a software engineering background, experience delivering user-facing front-end products, and 4+ years leading engineers. Salary ranges provided for Canada (CAD).