Web Development Expert - Fully Remote

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

• 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.
• 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.

• 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.
• Command-line comfort: unzipping an archive, standing up a static local server, and untangling a broken image reference.
• Professional written English for task justification.

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

• For details about the interview process and platform information, please check:
• 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.