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 dev tools as muscle memory. Command-line comfort: unzipping an archive, standing up a static local server, and untangling a broken image reference. Enough java script 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. #j-18808-ljbffr

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