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

Prolific; United States; Remote; USD 39,000 - 55,000; Full time

Job summary

Prolific is seeking Senior HTML/CSS Developers to join our Expert Network to train and evaluate AI models, focusing on high-quality frontend code and design implementation.

Ideal candidates have a strong background in Software Engineering or Frontend Development, with robust HTML/CSS skills, CSS architecture know-how, and deep accessibility and cross-browser experience. Paid tasks pay up to $40/hr, with flexible hours and the option to work from home.

Qualifications

• Educational background: a BSc or higher in Computer Science, Software Engineering, Web Development or 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 semantic markup and maintainable CSS, including BEM, design tokens, and modern CSS standards.

Responsibilities

• Evaluate code accuracy: review AI-generated HTML/CSS for correctness and semantic structure.
• Validate logic and reasoning: audit AI explanations for layout solutions to ensure technical soundness.
• Conduct execution testing: render model-generated markup and styles in appropriate environments for visual verification.
• 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

Frontend development

HTML/CSS

CSS Architecture

Accessibility (WCAG)

Cross-browser testing

Education

BSc or higher in CS/SE/Web Dev

Tools

Tailwind CSS

SASS/SCSS

CSS Modules

Job description

Prolific is seeking Senior HTML/CSS Developers to join our Expert Network to train and evaluate AI models, focusing on high-quality frontend code and design implementation.

Ideal candidates have a strong background in Software Engineering or Frontend Development, with robust HTML/CSS skills, CSS architecture know-how, and deep accessibility and cross-browser experience. Paid tasks pay up to $40/hr, with flexible hours and the option to work from home.