Frontend Engineer (AI Code Evaluator)


Company:	JVLM Tech
Salary:	from £65 an hour
Hours:	Part-time
Working pattern:	Remote
Job type:	Contract
Posting date:	27 Aug 2026
Closing date:	25 Sept 2026

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Summary

Mercor is building a high-quality dataset of human preference judgments on AI-generated frontend code. This is evaluation work, not authoring. The defining skill is not that you can build a page. It is that you can open someone else's page and tell how it was built and where it cuts corners.

Each task gives you a reference web page crawled from the real internet, delivered as a full zipped site tree plus screenshots of its default view and, on some pages, additional states reached by hovering, clicking or scrolling. Alongside it come two model attempts, A and B, each a zipped self-contained site tree. The models only ever saw the screenshots, never the source.

You download all three, run them locally, view each at a 1920x1080 viewport, interact with them to reach every required state, then open the source of both attempts and grade them against each other on visual fidelity per state and on how the code is actually constructed. Structure and responsiveness are explicitly part of the rubric, not just the render.

Every task ends in a written justification citing specific evidence. We need reasoning of the standard "B nests the article body in a single absolutely-positioned div, so the text overlaps the footer below 1600px, while A uses normal document flow", not "A looks closer".

Please read before applying. Each unit takes roughly 2 to 3 hours and is timed, so scattered 15-minute windows will not work. You need a real local development environment with administrator rights. A tablet, a Chromebook or a locked-down work machine that cannot run a local static server is not usable. You must also have at least one completed Mercor engagement delivered in full, as we are not onboarding net-new experts to this project.

Fully remote, worked on your own schedule as an independent contractor. Pay is set in US dollars at $90 per hour and paid weekly via Stripe or Wise. The sterling figure shown is an indicative conversion and will vary with the exchange rate.

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