Web Development Expert - Fully Remote | Upto $90/hr 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:

PS: Our team reviews applications daily. Please complete your AI interview and application steps to be considered for this opportunity.

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📌 Fullstack Developer (.Net) (Valladolid)
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