Front-End Developer — Global Team, Autonomy & Growth

FUT‑URE

Málaga

Remote

EUR 66,000 - 111,000

Full time

6 days ago

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Job summary

Mercor is seeking a Web Development Expert for a fully remote contract. The role requires 3–8 years of frontend or full-stack experience, strong HTML/CSS and JavaScript skills, and proficient use of browser DevTools.

You will evaluate visual fidelity across multiple rewrites, ensure responsive behavior, and justify design decisions with precise, evidence-based reasoning. The ideal candidate can work independently, README-style documentation, and communicate in professional English.

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 layouts.
Browser DevTools as muscle memory.
Command-line comfort: unzipping archives, standing up a static local server, and fixing broken image references.
Enough JavaScript to read a page's scripts and understand their DOM impact.
Professional written English for task justification.

Responsibilities

Render a reference page and two candidate replications at 1920×1080, and judge which is closer.
Diff visual fidelity in detail: box model, typography, color, borders, images, z-order and overflow.
Read source of attempts and grade construction quality, distinguishing correct replication from appearance-only accuracy.
Test responsiveness and identify defects like a navbar collapsing at 1400px.
Provide evidence-cited justifications for all preferences with concrete examples.
Apply the "this task is broken" escape hatch when appropriate.

Skills

Web dev experience

HTML & CSS

DevTools

JavaScript

English proficiency

Job description

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.

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