Senior HTML/CSS Frontend Engineer for AI Training (Remote)

Prolific Academic Ltd

United States

Remote

USD 33,062,000 - 55,104,000

Full time

14 days+

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Job summary

Prolific is seeking Senior HTML/CSS Developers to join our Expert Network to train and evaluate AI models. You’ll assess AI-generated frontend code, ensuring semantic structure, accessibility, and high-quality markup.

Requirements include a BSc or higher in a related field and real-world experience as a Senior Frontend Developer or UI Engineer specializing in HTML/CSS. This remote UK-based role offers flexible hours and competitive pay.

Qualifications

Educational Background: a BSc or higher in Computer Science, Software Engineering, Web Development, or a related field.
Professional Experience: real-world experience as a Senior Frontend Developer or UI Engineer specializing 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: strong markup quality with semantic HTML, maintainable CSS, and modern CSS practices like BEM and design tokens.

Responsibilities

Evaluate Code Accuracy: review AI-generated HTML/CSS for correctness and semantic structure.
Validate Logic & Reasoning: audit AI explanations for layout solutions and styling approaches.