Frontend Software Engineer

Frontend Engineer

Lea atentamente toda la información sobre esta oportunidad y luego utilice el botón de solicitud de abajo para enviar su CV y su candidatura.

Position: Frontend Engineer

Type: Freelance Hourly Contract

Compensation: $90/hour

Location: Remote

About the Opportunity

This 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 project