Enter a job title or keyword

Frontend Code Evaluation Specialist

Mercor

Job Location:

Vilnius - Lithuania

Monthly Salary: Not provided by the employer

Posted: 20 August 2026 (2 days ago)

Application Deadline: 17 November 2026

Vacancies: 1 Vacancy

Job Summary

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 DAngelo 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 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

38 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 pages 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 2030 mins to complete)