Frontend Code Evaluation Specialist

Mercor; Lisboa; Remote; EUR 189,911,000 - 270,479,000; Full time

Job summary

A Mercor está buscando um Frontend Code Evaluation Specialist para atuar remotamente sob contrato. O objetivo é comparar uma página de referência com duas réplicas, avaliando fidelidade visual e comportamento em diferentes larguras de tela.

O candidato deve dominar HTML, CSS e JavaScript, ter experiência em frontend e possuir inglês escrito profissional para justificativas técnicas. Experiência com ARIA, acessibilidade e debugging em DevTools são diferenciais.

Qualifications

• 3–8 anos de experiência profissional em web development frontend ou full-stack.
• Domínio de HTML e CSS semântico, flexbox, grid e media queries.
• Domínio de DevTools no browser.
• Conforto com linha de comando: descompactar um artefato, iniciar servidor local e resolver referências de imagens.
• Conhecimento de JavaScript para entender scripts e o DOM.
• Inglês escrito profissional para justificar tarefas.

Responsibilities

• Renderizar uma página de referência e duas réplicas, avaliando fidelidade 1920x1080.
• Analisar fidelidade visual: modelo de caixas, tipografia, cores, bordas e recursos visuais.
• Ler as fontes de ambos os trabalhos e classificar a qualidade de construção.
• Testar responsividade e identificar falhas em diferentes larguras de tela.
• Escrever justificativas específicas com evidências para cada preferência.

Skills

Frontend development

HTML

CSS

JavaScript

DevTools

Command-line

English

Job description

Frontend Code Evaluation Specialist

Empresa : Mercor Tipo de Emprego : Periodo Integral Lisbon Lisbon District Portugal

Descrição do Emprego - Frontend Code Evaluation Specialist

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 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 1920x1080. 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.