Senior HTML/CSS Developer for AI Training (Remote)

Prolific Academic Ltd; United States; Remote; USD 33,000 - 55,000; Full time

Job summary

Prolific is seeking a Senior HTML/CSS Developer to join our Expert Network and help train and evaluate AI models. If you have a background in Frontend Development or Software Engineering, you’ll take a quick skill test and, if successful, join Prolific as a participant for paid tasks.

Experts review AI-generated HTML/CSS, ensure accessibility and cross-browser compatibility, and provide feedback on design systems. Tasks are paid and can be completed from home in the USA.

Qualifications

• Educational Background: a BSc or higher in Computer Science, Software Engineering, Web Development, or a closely related field.
• Professional Experience: real-world experience as a Senior Frontend Developer or UI Engineer specialising in HTML/CSS.
• Coding Proficiency: ability to independently build complex, responsive layouts and components without relying on frameworks or libraries.
• Deep Domain Knowledge: expert understanding of the CSS cascade, specificity, the box model, Flexbox, CSS Grid, accessibility standards (WCAG), and cross-browser compatibility.
• Code Quality: a high standard for clean, semantic markup and maintainable CSS, including adherence to BEM methodology, design tokens, and modern CSS standards.

Responsibilities

• Evaluate Code Accuracy: review AI-generated HTML/CSS for functional correctness, semantic structure, and adherence to best practices.
• Validate Logic & Reasoning: audit the step-by-step explanations provided by AI for layout solutions and styling approaches to ensure they are technically sound.
• Conduct Execution Testing: render model-generated markup and stylesheets in appropriate environments to verify visual output and cross-browser behaviour.
• Annotate Model Performance: identify areas where a model produces inaccessible markup, inefficient selectors, deprecated attributes, or hallucinated CSS properties.
• Refine Technical Logic: provide structured feedback on how models reason through responsive design, component architecture, or design system implementation.

Skills

Educational Background

Frontend Experience

HTML/CSS Expertise

CSS Architecture

Code Quality Practices

Education

BSc or higher in CS/SE/Web

Tools

Tailwind CSS

SASS/SCSS

CSS Modules

Job description

Prolific is seeking a Senior HTML/CSS Developer to join our Expert Network and help train and evaluate AI models. If you have a background in Frontend Development or Software Engineering, you’ll take a quick skill test and, if successful, join Prolific as a participant for paid tasks.

Experts review AI-generated HTML/CSS, ensure accessibility and cross-browser compatibility, and provide feedback on design systems. Tasks are paid and can be completed from home in the USA.