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

Role overview Contribute senior frontend expertise to training and evaluating AI models that generate HTML and CSS. Work is task based: review code and technical explanations, check rendered results, and give structured feedback on implementation quality. Candidates complete a short skills assessment before joining; tasks may require an uninterrupted hour, though some are shorter.

Responsibilities - Assess generated markup and styles for correctness, semantics, and maintainability. - Check whether explanations of layout and styling decisions are technically sound. - Render and inspect code to verify visual results and cross-browser behaviour. - Flag accessibility problems, inefficient selectors, outdated markup, and invalid CSS. - Give feedback on responsive layouts, component structure, and design system approaches.

Requirements - A degree at bachelor level or higher in computer science, software engineering, web development, or a related technical field. - Professional experience as a senior frontend developer or UI engineer focused on HTML and CSS. - Ability to build complex responsive layouts and components without depending on frameworks or libraries. - Strong understanding of CSS specificity and the cascade, the box model, Flexbox, Grid, WCAG accessibility, and browser compatibility. - High standards for semantic HTML and maintainable CSS, including familiarity with BEM, design tokens, and modern CSS. - Expert knowledge of HTML5 and modern CSS, including custom properties, animations, and current layout techniques.

Nice to have - Experience with Tailwind CSS, Sass/SCSS, CSS Modules, or component based design systems. - Familiarity with browser developer tools, accessibility auditing tools, and cross-browser testing services.

Benefits and work setup - Remote, flexible participation with paid tasks; listed rates may reach $40 per hour depending on skills and experience. - Successful candidates can join after a 10 to 15 minute assessment.