Web Development Expert - Fully Remote | Upto $90/Hr

Mercor; San Francisco (CA); Hybrid; GBP 74,000 - 111,000; Full time

Job summary

Mercor, a remote-friendly contract opportunity, seeks a Frontend Engineer to craft polished user interfaces and deliver accurate reproductions for evaluation tasks.

The role emphasizes semantic HTML/CSS, responsive layouts, ARIA semantics, and robust debugging. You will work from a high standards checklist and communicate clearly in English.

You’ll collaborate with a small team, review two candidate implementations, and provide precise notes on fidelity, layout, and accessibility.

Qualifications

• 3–8 years of professional web development experience in frontend or full-stack roles.
• Fluency across web eras and legacy layouts.
• Proficient in hand-written HTML and CSS with semantic markup, flexbox, grid, media queries, and legacy layouts.
• Comfort with the command-line: unzip archives, run a static server, fix broken image references.
• Strong professional written English for task justification.

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, 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.
• Provide detailed explanations like "B nests the article body in a single absolutely-positioned div...".
• Use the "this task is broken" escape hatch with judgment.

Skills

Frontend web development

Web standards

English writing

Tools

ARIA

DOM

Job description

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.
• 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.
• Command-line comfort: unzipping an archive, standing up a static local server, and untangling a broken image reference.
• Professional written English for task justification.

Preferred

• Prior RLHF, preference-labeling, model-evaluation, or structured code-review work.
• 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: https://talent.docs.mercor.com/welcome
• For any help or support, reach out to: [e-mail]

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