Frontend Code Evaluation Specialist

About the job 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 Role Responsibilities Render 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.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.Application Process (Takes ***** mins to complete) Upload resume AI interview based on your resume Submit form Resources & Support 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.

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.

Madrid, España

About the job Mercor connects elite creative and technical talent with leading AI research labs., More than one completed Mercor project and availability in contiguous multi-hour blocks. Application Process (Takes ***** mins to complete) Upload resume AI interview based on your resume Submit form Resources & Support 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.