About the job
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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

Position: Frontend Engineer
Type: Contract
Compensation: $90/hour
Location: Remote

Role Responsibilities

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- 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

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- 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

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- 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. xjncmbx

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

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📌 Frontend Code Evaluation Specialist (Gallicano Nel Lazio)
🏢 Mercor
📍 Gallicano Nel Lazio