HTML​/CSS - Senior Developers - AI Training - Newcastle upon Tyne, UK

Use senior-level HTML and CSS knowledge to help assess and improve AI-generated frontend work. This is project-based participant work: candidates first complete a brief skills assessment, and those who qualify may receive paid tasks involving code review, rendering checks, and written technical feedback.

• Review AI-produced HTML and CSS for functional accuracy, semantic structure, and quality of implementation.
• Evaluate the technical reasoning behind proposed layout and styling solutions.
• Run or render the supplied code to check its appearance and behaviour in relevant browsers.
• Identify accessibility gaps, unnecessarily complex selectors, deprecated markup, and CSS that is unsupported or made up.
• Explain where generated approaches to responsive design, component structure, or design systems need improvement.

• Bachelor’s degree or above in computer science, software engineering, web development, or a related technical field.
• Real-world senior frontend development or UI engineering experience focused on HTML and CSS.
• Confidence creating complex responsive interfaces without depending on frameworks or libraries.
• Deep understanding of CSS specificity and cascade, the box model, Flexbox, CSS Grid, WCAG accessibility, and cross-browser behaviour.
• Ability to produce clean semantic markup and maintainable styles, using practices such as BEM and design tokens.
• Proficiency in modern HTML and CSS; experience with tools or methods such as Sass/SCSS, Tailwind, CSS Modules, Dev Tools, accessibility auditing, and browser testing is relevant.

Applicants complete a 10–15 minute assessment before potential acceptance. Tasks are paid, with rates stated as potentially reaching $40 per hour based on skills and experience. Some assignments need an uninterrupted hour, though shorter tasks are common. The work is described as flexible and remote, and depends on available projects.