HTML/CSS - Senior Developers - AI Training - Edinburgh, UK

About Prolific Prolific is not just another player in the AI space – we are building the biggest pool of quality human data in the world. The role We’re looking for Senior HTML/CSS Developers to join our Expert Network to help train and evaluate cutting‑edge AI models. If you have a background in Software Engineering or Frontend Development , we’ll send you a quick 10‑ to 15‑minute test to assess your skills.

If successful, you’ll be invited to join Prolific as a participant, where you’ll get paid to help AI understand and produce high‑quality frontend code and design implementation. Researchers looking for your skills tend to pay up to $40/hr, depending on skills and experience . You must be prepared to complete paid tasks that require one hour of uninterrupted work , though many are shorter.

What you’ll bring Educational Background: a BSc or higher in Computer Science, Software Engineering, Web Development, or a closely related technical field. Professional Experience: real‑world experience as a Senior Frontend Developer or UI Engineer specialising 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: a high standard for clean, semantic markup and maintainable CSS, including adherence to BEM methodology, design tokens, and modern CSS standards. What you’ll be doing in the role Evaluate Code Accuracy: review AI‑generated HTML/CSS for functional correctness, semantic structure, and adherence to best practices.

Validate Logic & Reasoning: audit the step‑by‑step explanations provided by AI for layout solutions and styling approaches to ensure they are technically sound. Conduct Execution Testing: render model‑generated markup and stylesheets in appropriate environments to verify visual output and cross‑browser behaviour. Annotate Model Performance: identify areas where a model produces inaccessible markup, inefficient selectors, deprecated attributes, or hallucinated CSS properties.

Refine Technical Logic: provide structured feedback on how models reason through responsive design, component architecture, or design system implementation. Key Technologies Core Languages: expert mastery of HTML5 and CSS3/4, including custom properties, animations, and modern layout systems. Frameworks & Methodologies: extensive experience with Tailwind CSS, SASS/SCSS, or CSS Modules, and familiarity with component‑driven design systems.

Testing & Tools: proficiency with browser DevTools, accessibility auditing tools (e.g., axe, Lighthouse), and cross‑browser testing platforms. Benefits Competitive pay rates, flexible hours, and the ability to work from home. #J-18808-Ljbffr