Senior HTML/CSS Frontend for AI Training - Remote

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

Job summary

Prolific invites Senior HTML/CSS Developers to join our Expert Network to help train and evaluate AI models. You will review and build frontend code, ensuring clean markup and responsive layouts. This remote role offers flexible hours and competitive pay.

Expect to work on testing, validation, and refinement of AI-generated frontend output, with a focus on accessibility, performance, and cross-browser compatibility.

Qualifications

• Educational background: a BSc or higher in Computer Science, Software Engineering, Web Development, or a closely related technical field.
• Real-world experience as a Senior Frontend Developer or UI Engineer specializing in HTML/CSS.
• Ability to build complex, responsive layouts and components without relying on frameworks or libraries.
• Expert understanding of CSS cascade, specificity, box model, Flexbox, CSS Grid, accessibility standards (WCAG), and cross-browser compatibility.
• High standards for clean, semantic markup and maintainable CSS, including adherence to BEM, 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 step-by-step explanations for layout solutions and styling approaches for technical soundness.
• Conduct Execution Testing: render model-generated markup and stylesheets to verify visuals and cross-browser behavior.
• Annotate Model Performance: identify inaccessible markup, inefficient selectors, deprecated attributes, or hallucinated CSS properties.
• Refine Technical Logic: provide feedback on how models reason about responsive design and design system implementation.

Skills

Senior frontend developer

HTML/CSS

Frontend development

CSS governance

Accessibility (WCAG)

Education

BSc or higher in Computer Science / Software Engineering / Web Development

Tools

Tailwind CSS

SASS/SCSS

CSS Modules

DevTools

Axe / Lighthouse

Job description

Prolific invites Senior HTML/CSS Developers to join our Expert Network to help train and evaluate AI models. You will review and build frontend code, ensuring clean markup and responsive layouts. This remote role offers flexible hours and competitive pay.

Expect to work on testing, validation, and refinement of AI-generated frontend output, with a focus on accessibility, performance, and cross-browser compatibility.