Web Development Expert
- Fully Remote | Upto $90/hr 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 EngineerType: ContractCompensation: $90/hourLocation: 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 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. 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.

📌 Frontend Developer Nextjs (Barcelona)
🏢 AMARIS GROUP
📍 Barcelona