About the job
Mercor connects elite creative and technical talent with leading AI research labs.

Headquartered in San Francisco, our investors include Benchmark , General Catalyst , Peter Thiel , Adam D'Angelo , Larry Summers , and Jack Dorsey .

Position: Frontend Engineer
Type: Contract
Compensation: $90/hour
Location: Remote
Role Responsibilities
Render a reference page and two candidate replications at 1920×1080.

Judge which is the closer reproduction, state by state.

Diff visual fidelity in detail: box model and spacing, typography (family, size, weight, line-height, letter-spacing), color and border treatment, image and asset handling, z-order, and overflow.

Read the source of both attempts and grade construction quality.

Distinguish a replication that is genuinely correct from one that merely looks correct at one viewport.

Test responsiveness.

Identify defects such as a nav bar that looks right at 1920px but collapses at 1400px.

Write specific, evidence-cited justifications for every preference.

Provide detailed explanations like /"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./"
Use the /"this task is broken/" escape hatch with judgment.

Distinguish a task that genuinely cannot be completed from one that is merely hard.

Qualifications
Must-Have




3–8 years of professional web development experience in frontend or full-stack work.

Fluency across web eras, including legacy layouts like used for layout.

Command of hand-written HTML and CSS : semantic markup, flexbox, grid, media queries, and legacy float- and table-based layouts.

Browser Dev

Tools as muscle memory.

Command-line comfort: unzipping an archive, standing up a static local server, and untangling a broken image reference.

Enough Java

Script to read a page's scripts and understand their DOM impact.

Professional written English for task justification.

Preferred
Prior RLHF , preference-labeling, model-evaluation, or structured code-review work.

Pixel-perfect design-to-code experience.

Accessibility expertise ( ARIA , semantic landmarks, heading hierarchy).

Familiarity with how LLMs fail at code generation.

Web scraping, archiving, or DOM-parsing background.

More than one completed Mercor project and availability in contiguous multi-hour blocks.

Application Process (Takes 20–30 mins to complete)
Upload resume
AI interview based on your resume
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Resources & Support
For details about the interview process and platform information, please check: https://talent.docs.mercor.com/welcome
For any help or support, reach out to:
PS: Our team reviews applications daily.

Please complete your AI interview and application steps to be considered for this opportunity.

📌 Web Development Expert - Fully Remote (México)
🏢 Mercor
📍 México