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# Frontend Code Evaluation Specialist

- **Company:** Mercor
- **Location:** Madrid, Spain (Remote available)
- **Salary:** €187,200.0
- **Contract:** Permanent contract
- **Skills:** HTML, JavaScript (Programming Language), Artificial Intelligence, Cascading Style Sheets (CSS), Command-Line Interface, Code Generation, Web Scraping, Web Development, Semantic HTML, Large Language Models, Pixel Perfect, Front End Software Development
- **Published:** August 26, 2026
- **Apply:** https://www.buscojobs.com.es/frontend-code-evaluation-specialist-en-madrid-ID-369067705

## About the Role

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.

## Description

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.


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