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

Role overview Apply experienced HTML and CSS knowledge to improve AI-generated frontend work. The assignments combine code review, technical reasoning checks, browser rendering, and structured annotation of model performance. This is flexible, remote task work, accessed after a short assessment; individual tasks vary in length and may require an uninterrupted hour.

Responsibilities - Judge whether generated HTML/CSS is functional, semantic, and aligned with established frontend practices. - Verify the technical reasoning behind proposed layout and styling solutions. - Render outputs and inspect visual fidelity and behaviour across browsers. - Record issues such as accessibility gaps, inefficient selectors, deprecated attributes, and invented CSS properties. - Offer specific guidance on responsive implementation, component architecture, and design systems.

Requirements - A bachelor’s degree or above in computer science, software engineering, web development, or a closely related field. - Demonstrated professional experience as a senior frontend developer or UI engineer specialising in HTML and CSS. - Ability to create complex responsive layouts and components independently, without relying on frameworks or libraries. - Expert command of CSS specificity and cascade, the box model, Flexbox, Grid, WCAG, and cross-browser compatibility. - Strong commitment to semantic HTML and maintainable styles, with knowledge of BEM methodology, design tokens, and modern CSS standards. - Mastery of HTML5 and contemporary CSS, including custom properties, animations, and modern layout features.

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

Benefits and work setup - Remote participation with flexible paid assignments; rates may be as high as $40 per hour based on skills and experience. - Entry follows a 10 to 15 minute skills test. Some tasks are shorter than an hour.