About the jobMercor 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 EngineerType: ContractCompensation: $90/hourLocation: RemoteRole ResponsibilitiesRender a reference page and two candidate replications at ****×****.
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 ****px but collapses at ****px.
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 ****px, 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.QualificationsMust-Have3–8 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 DevTools as muscle memory.
Command‐line comfort: unzipping an archive, standing up a static local server, and untangling a broken image reference.
Enough JavaScript to read a page's scripts and understand their DOM impact.
Professional written English for task justification.PreferredPrior 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.Resources & SupportFor details about the interview process and platform information, please check: For any help or support, reach out to:
#J-*****-Ljbffr

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