Senior HTML/CSS Engineer for AI Training – Remote

Prolific Academic Ltd; United States; Remote; USD 45,000 - 65,000; Full time

Job summary

Prolific Academic Ltd in the UK is seeking Senior HTML/CSS Developers to join our Expert Network, helping train and evaluate AI models by producing high-quality frontend code and design implementations. Ideal candidates bring real-world frontend experience, deep knowledge of HTML/CSS, responsive layouts, accessibility, and modern CSS tooling.

Successful testers are paid to complete concise tasks, often requiring about one hour per assignment.

Qualifications

• BSc or higher in Computer Science, Software Engineering, Web Development, or equivalent.
• Real-world experience as a Senior Frontend Developer or UI Engineer focusing on HTML/CSS.
• Ability to build complex, responsive layouts without heavy frameworks.
• Deep knowledge of CSS cascade, specificity, box model, Flexbox, Grid, accessibility (WCAG), cross-browser compatibility.

Responsibilities

• Evaluate AI-generated HTML/CSS for correctness and accessibility.
• Audit AI explanations for layout decisions and styling approaches.
• Render and test markup in appropriate environments to verify visuals and cross-browser behavior.
• Provide structured feedback on how models reason about responsive design and component architecture.

Skills

HTML/CSS

Frontend development

Responsive design

CSS architecture

Education

BSc in CS/Software Engineering/Web Development

Tools

HTML5

CSS3/4

BEM

Tailwind CSS

Job description

Prolific Academic Ltd in the UK is seeking Senior HTML/CSS Developers to join our Expert Network, helping train and evaluate AI models by producing high-quality frontend code and design implementations. Ideal candidates bring real-world frontend experience, deep knowledge of HTML/CSS, responsive layouts, accessibility, and modern CSS tooling.

Successful testers are paid to complete concise tasks, often requiring about one hour per assignment.