Remoto: Teletrabajo

Frontend EngineerPosition: Frontend EngineerType: Freelance Hourly ContractCompensation: $90/hourLocation: RemoteAbout the OpportunityThis opportunity is for experienced Frontend Engineers and Full-Stack Developers interested in evaluating AI-generated web interfaces and code.The work focuses on comparing AI-generated frontend implementations against real-world reference websites, assessing both visual 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 Do- Render a reference webpage and two AI-generated implementations at a 1920×1080 viewport and evaluate which version most accurately reproduces the reference.- Compare visual fidelity across different interface states, including layout, spacing, typography, colors, borders, images, layering, and overflow behavior.- Review the source code of AI-generated implementations and assess HTML 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.- Provide specific,



evidence-based written justifications explaining why one implementation is stronger than another.- Identify genuinely broken evaluation tasks while distinguishing them from tasks that are simply challenging.Required Qualifications- 3–8 years of professional web development experience, primarily in frontend or full-stack engineering.- Strong hands-on experience with HTML, CSS, JavaScript, responsive web development, and modern frontend engineering practices.- Deep understanding of semantic HTML, Flexbox, CSS Grid, media queries, and responsive layouts.- Ability to read and understand both modern and legacy web layouts, including float-based and table-based designs.- Strong proficiency with browser Developer Tools, including DOM inspection, computed styles, viewport testing, and interactive state debugging.- Comfortable working from the command line, including extracting 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 provide clear, detailed technical justifications.- Strong attention to detail and the ability to identify subtle visual and structural differences.Preferred Qualifications- Prior experience with RLHF, preference labeling, AI model evaluation, structured code review,



or human-feedback projects.- Pixel-perfect design-to-code experience, including work with design systems, templates, or production web interfaces.- Knowledge of web accessibility, including ARIA, semantic landmarks, and heading hierarchy.- Familiarity with common failure patterns in AI-generated frontend code.- Experience with web 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 Requirements- Desktop or laptop capable of displaying a 1920×1080 viewport.- Ability to run a local development environment and static web server.- Administrator access to your own computer for installing required development tools.Important Project Requirements- Each evaluation unit typically takes 2–3 hours and is completed within a defined time window.- This is not microtask work and requires the ability to dedicate uninterrupted blocks of time to individual evaluations.- A functioning local development environment is required.- The role is intended for practicing web developers with 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.Compensation- Competitive compensation of $90/hour.- Independent contractor engagement.- Compensation is based on completed evaluation work in accordance with project requirements.Application Process- Easy Apply on LinkedIn- Check Email for Next Steps- Participate in Resume Evaluation & Interview Stage

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