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Senior HTML/CSS Developer for AI Training (Liverpool)

Prolific · Liverpool

New
Senior 🇬🇧 English
HTML5 CSS3 Flexbox CSS Grid BEM Design tokens Tailwind CSS SASS SCSS CSS Modules Browser DevTools axe Lighthouse

Job description

About the role

Prolific is seeking senior HTML/CSS developers to join its Expert Network and help train cutting‑edge AI models. You will evaluate AI‑generated frontend code, provide feedback, and ensure high‑quality, accessible markup.

Key responsibilities

  • Review AI‑generated HTML/CSS for functional correctness, semantic structure and best‑practice compliance.
  • Validate AI explanations of layout and styling decisions.
  • Render and test markup across browsers to verify visual output and accessibility.
  • Annotate model performance, highlighting issues such as inefficient selectors or hallucinated properties.
  • Provide structured feedback to improve the model’s reasoning on responsive design and component architecture.

Required profile

  • BSc or higher in Computer Science, Software Engineering, Web Development or related field.
  • Proven senior‑level experience as a Frontend Developer or UI Engineer specializing in HTML/CSS.
  • Deep knowledge of CSS cascade, specificity, box model, Flexbox, CSS Grid, WCAG accessibility standards and cross‑browser compatibility.
  • Commitment to delivering one‑hour uninterrupted paid tasks.

Required skills

  • HTML5
  • CSS3/4 (custom properties, animations, modern layout systems)
  • Flexbox & CSS Grid
  • BEM methodology, design tokens
  • Tailwind CSS, SASS/SCSS, CSS Modules
  • Browser DevTools, accessibility auditing tools (axe, Lighthouse)
  • Cross‑browser testing platforms

What we offer

  • Pay up to $40 per hour, depending on experience.
  • Flexible, task‑based work that can be completed remotely.
  • Opportunity to influence the development of advanced AI models.

Questions fréquentes

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Published 1 hour ago

Expires 1 month from now

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Prolific

Liverpool