Frontend Code Evaluation Specialist Desarrollador Fullstack (SR) – Python / React / Data Warehouse / Microservicios Project Manager SAP Sr. TikTok Shop Growth Manager Facilities Manager Sr. experimentado - Compliance Program…

Mercor Rocket Stars MaxIT Consulting - Max Corporate Group ScaleJet PedidosYa PwC Argentina Indero U; Buenos Aires; Remote; ARS 160,798,000 - 217,182,000; Part time

Job summary

Mercor is seeking a Frontend Engineer on a contract basis to render reference pages and compare candidate replications at 1920×1080, assessing fidelity and responsiveness. This remote role demands deep knowledge of HTML, CSS, and modern frontend practices, with a focus on accessibility and cross-browser consistency.

Strong written English for task justification is essential. Qualified candidates have 3–8 years of professional web development experience, hands-on markup skills, and familiarity

Qualifications

• 3–8 years of professional web development experience in frontend or full-stack work.
• Fluency across web eras, including legacy layouts.
• Proficient with hand-written HTML and CSS: semantic markup, flexbox, grid, media queries, legacy float- and table-based layouts.
• Experience with debugging and testing across browsers.

Responsibilities

• 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, spacing, typography, color and border treatment, image handling, z-order, overflow.
• Read the source of both attempts and grade construction quality; identify defects and provide evidence-based justifications.

Skills

HTML & CSS

JavaScript

Browser DevTools

Command-line

Responsive design

Accessibility

Tools

DevTools

Job 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 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

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