Frontend Engineer¿Tiene lo que se necesita para triunfar? La siguiente información debe ser leída atentamente por todos los candidatos.Position:Frontend EngineerType:Freelance Hourly ContractCompensation:$90/hourLocation:RemoteAbout the OpportunityThis opportunity is for experiencedFrontend Engineers and Full-Stack Developersinterested in evaluating AI-generated web interfaces and code.The work focuses on comparing AI-generated frontend implementations against real-world reference websites, assessing bothvisual fidelity and underlying code quality .This is an evaluation-focused role rather than a traditional development position. The key requirement is the ability to identify how a webpage is constructed, recognize technical shortcuts, and provide precise, evidence-based evaluations.What You'll DoRender a reference webpage and two AI-generated implementations at a1920×1080 viewportand evaluate which version most accurately reproduces the reference.Compare visual fidelity across different interface states, includinglayout, spacing, typography, colors, borders, images, layering, and overflow behavior .Review the source code of AI-generated implementations and assessHTML structure, CSS architecture, responsiveness, maintainability, and implementation quality .Identify technical shortcuts such as excessive hardcoded positioning, unnecessary absolute positioning, poorly structured markup, or image-based recreations.Test responsive behavior across different viewport sizes and identify layout or usability defects.Use browser DevTools to inspect elements, computed styles, DOM structure, and interactive states.Providespecific,



evidence-based written justificationsexplaining why one implementation is stronger than another.Identify genuinely broken evaluation tasks while distinguishing them from tasks that are simply challenging.Required Qualifications3–8 years of professional web development experience , primarily in frontend or full-stack engineering.Strong hands-on experience withHTML, CSS, JavaScript, responsive web development, and modern frontend engineering practices .Deep understanding ofsemantic HTML, Flexbox, CSS Grid, media queries, and responsive layouts .Ability to read and understand bothmodern and legacy web layouts , including float-based and table-based designs.Strong proficiency withbrowser Developer Tools , including DOM inspection, computed styles, viewport testing, and interactive state debugging.Comfortable working from the command line, includingextracting archives, running local development servers, and troubleshooting asset paths .Sufficient JavaScript knowledge to understand how scripts interact with the DOM and user interactions.Strong professional written English and the ability to provideclear, detailed technical justifications .Strong attention to detail and the ability to identify subtle visual and structural differences.Preferred QualificationsPrior experience withRLHF, preference labeling, AI model evaluation, structured code review,



or human-feedback projects .Pixel-perfect design-to-code experience, including work withdesign systems, templates, or production web interfaces .Knowledge ofweb accessibility , including ARIA, semantic landmarks, and heading hierarchy.Familiarity with common failure patterns inAI-generated frontend code .Experience withweb scraping, website archiving, DOM parsing, or working with complex crawled website structures .Previous experience completing AI evaluation projects and working in multi-hour evaluation sessions.Equipment RequirementsDesktop or laptop capable of displaying a1920×1080 viewport .Ability to run alocal development environment and static web server .Administrator access to your own computer for installing required development tools.Important Project RequirementsEach evaluation unit typically takes2–3 hoursand is completed within a defined time window.This isnot microtask workand requires the ability to dedicate uninterrupted blocks of time to individual evaluations.A functioning local development environment is required.The role is intended forpracticing web developerswith strong frontend and UI implementation expertise.Backend-only, ML/data-science-only, mobile-native-only, and DevOps-only backgrounds are generally not suitable for this evaluation work.CompensationCompetitive compensation of $90/hour.Independent contractor engagement.Compensation is based on completed evaluation work in accordance with project requirements. xqziphu Application ProcessEasy Apply on LinkedInCheck Email for Next StepsParticipate in Resume Evaluation & Interview StageHay opciones de teletrabajo/trabajo desde casa disponibles para este puesto.

📌 Frontend Engineer (Remote | Up to $90/hr) (Vigo)
🏢 Synthires
📍 Vigo