Frontend Code Evaluation Specialist

mercor; Österreich; À distance; EUR 74 000 - 147 000; Temps partiel

Résumé du poste

Mercor is seeking a Frontend Engineer for a remote, contract role to join a team delivering frontend solutions for AI research collaborations. You will craft pixel-perfect UI components, ensure accessibility, and collaborate with designers and backend engineers to deliver robust frontends.

The ideal candidate has 3–8 years of web development experience, strong HTML/CSS/JavaScript skills, and solid familiarity with legacy layouts and modern responsive techniques.

Qualifications

• 3–8 years of professional web development experience in frontend or full-stack work.
• Fluency across web eras, including legacy layouts.
• 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.

Responsabilités

• Render a reference page and two candidate replications at 1920×1080 and judge which is closer, state by state.
• Diff visual fidelity in detail: box model, typography, color and border treatment, image handling, z-order, and overflow.
• Read the source of both attempts and grade construction quality; distinguish truly correct from merely looks correct at a viewport.
• Test responsiveness and identify defects like a nav bar collapsing at smaller widths.
• Provide evidence-based, detailed justifications for every preference with concrete examples.
• Use the escape hatch to distinguish a task that cannot be completed from a hard one.

Connaissances

HTML/CSS

JavaScript

DevTools

Accessibility

English writing

Browser debugging

Description du poste

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 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.

Resources & Support

• For details about the interview process and platform information, please check:
• For any help or support, reach out to: