Frontend Code Evaluation Specialist In-Person English Trainer

Mercor Aula Intercultural; Buenos Aires; A distancia; ARS 102.000 - 146.000; A tiempo parcial

Descripción de la vacante

Mercor is seeking a Frontend Engineer for a remote contract role. You will render reference pages and compare two candidate replications at 1920×1080, judging fidelity with precise, evidence-based justification.

Required are 3–8 years in web development, strong HTML/CSS, modern layout techniques, and solid English writing for task justification. This contract offers $90/hour and flexible remote work from anywhere.

Formación

• 3–8 years of professional web development experience in frontend or full-stack roles.
• Fluency with semantic HTML/CSS, flexbox, grid, and media queries.
• Experience with browser DevTools and basic command-line tasks.
• Professional written English for task justification.

Responsabilidades

• Render a reference page and two candidate replications at 1920×1080 and judge fidelity.
• Read the source and grade construction quality with evidence and reasoning.
• Explain discrepancies with concrete, justified rationale.

Conocimientos

HTML & CSS

Flexbox & Grid

Media queries

Legacy layouts

Browser DevTools

Command-line basics

JavaScript basics

English writing

Herramientas

Git

Descripción del empleo

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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