HTML/CSS - Senior Developers - AI Training - Las Vegas, USA

Role overview Contribute senior frontend expertise to the training and evaluation of AI systems through paid, task-based work. You’ll assess generated HTML and CSS, test rendered results, and provide clear technical feedback on implementation quality and reasoning. A short skills assessment is required before joining; tasks may take an uninterrupted hour, though many are shorter.

Responsibilities - Review generated markup and styles for correctness, semantic structure, maintainability, and standards compliance. - Check the technical soundness of explanations for layout and styling choices. - Render and inspect code to confirm visual output and cross-browser behavior. - Flag accessibility issues, inefficient selectors, obsolete attributes, and unsupported CSS. - Give structured feedback on responsive design, component structure, and design system approaches.

Requirements - Bachelor’s degree or higher in computer science, software engineering, web development, or a related 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 relying on frameworks or libraries. - Expert knowledge of the CSS cascade, specificity, box model, Flexbox, Grid, WCAG accessibility, and browser compatibility. - Strong command of semantic HTML and maintainable CSS, including BEM, design tokens, and modern standards. - Careful code review skills, including the ability to explain technical issues clearly.

Nice to have - Experience with Tailwind CSS, Sass/SCSS, CSS Modules, and component-based design systems. - Familiarity with browser developer tools, accessibility auditing tools, and cross-browser testing platforms. - Knowledge of HTML5 and modern CSS features such as custom properties, animations, and contemporary layout systems.

Benefits and work setup - Flexible, remote task work, with compensation reported up to $40 per hour depending on skills and experience. - A 10–15 minute skills test is used to assess suitability before joining.