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Senior HTML/CSS Developer – AI Training (Cambridge)

Prolific · Cambridge

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Senior 🇬🇧 English
HTML5 CSS3 custom properties animations Flexbox CSS Grid WCAG BEM design tokens Tailwind CSS SASS SCSS CSS Modules browser DevTools axe Lighthouse cross-browser testing platforms

Description du poste

About the role

Prolific is seeking senior HTML/CSS developers to join its Expert Network and help train cutting‑edge AI models. After a short skills test, successful candidates will work as paid participants, reviewing and improving AI‑generated frontend code.

Key responsibilities

  • Evaluate AI‑generated HTML/CSS for functional correctness, semantic structure and best‑practice compliance.
  • Validate the logical explanations provided by the AI for layout and styling decisions.
  • Execute rendering tests across browsers to verify visual output and cross‑browser behavior.
  • Annotate model performance, highlighting inaccessible markup, inefficient selectors or deprecated properties.
  • Provide structured feedback to refine the model’s reasoning on responsive design and component architecture.

Required profile

  • BSc or higher in Computer Science, Software Engineering, Web Development or a related field.
  • Proven senior‑level experience as a Frontend Developer or UI Engineer specializing in HTML/CSS.
  • Strong ability to build complex, responsive layouts without relying on frameworks.
  • Deep knowledge of CSS cascade, specificity, box model, Flexbox, CSS Grid, accessibility standards (WCAG) and cross‑browser compatibility.
  • Commitment to clean, semantic markup and maintainable CSS following BEM methodology and design‑token standards.

Required skills

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

What we offer

  • Competitive hourly rate up to $40 per hour.
  • Flexible, remote tasks that can be completed in one‑hour blocks.
  • Opportunity to influence the development of advanced AI models.

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Prolific

Cambridge