Frontend Code Evaluation Specialist

Stack

Responsibilities

• ▹Render a reference page and two candidate replications at 1920×1080 and 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 handling, z-order, 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, e.g. find defects such as a nav bar that looks right at 1920px but collapses at 1400px
• ▹Write specific, evidence-cited justifications for every preference
• ▹Use the “this task is broken” escape hatch with judgment, separating truly impossible tasks from merely hard ones

Requirements

• ▹3–8 years of professional web development experience in frontend or full-stack work
• ▹Fluency across web eras, including legacy float- and table-based layouts
• ▹Command of hand-written HTML and CSS: semantic markup, flexbox, grid, media queries
• ▹Browser DevTools as muscle memory
• ▹Command-line comfort: unzipping an archive, standing up a static local server, fixing a broken image reference
• ▹Enough JavaScript to read a page's scripts and understand their DOM impact
• ▹Professional written English for task justification

Nice to have

• ▹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

Soft skills

What we offer

• ▹Remote work
• ▹Contract work at $90/hour

About the company

Mercor connects elite creative and technical talent with leading AI research labs. It is headquartered in San Francisco.