HTML/CSS - Senior Developers - AI Training - Denver, USA

Role overview Review and assess AI-generated frontend work to help improve models’ ability to produce accurate, accessible HTML and CSS. This expert contributor role combines code review, testing rendered results, and structured feedback on the model’s technical reasoning and implementation choices.

Responsibilities - Check generated markup and styles for functional accuracy, semantic structure, and sound practices. - Assess explanations of layout and styling decisions for technical correctness. - Render generated pages and verify their appearance and behavior across browsers. - Flag accessibility issues, inefficient selectors, deprecated markup, and invalid or invented CSS properties. - Give structured feedback on responsive design, component organization, and design system implementation.

Requirements - A bachelor’s degree 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 independently, without relying on frameworks or libraries. - Deep knowledge of CSS cascade and specificity, the box model, Flexbox, Grid, WCAG accessibility, and cross-browser behavior. - Strong standards for semantic HTML and maintainable CSS, including BEM, design tokens, and modern CSS. - Proficiency with HTML5 and modern CSS, plus experience with tools such as Sass/SCSS, Tailwind CSS, CSS Modules, browser DevTools, accessibility audits, and cross-browser testing.

Benefits and work setup Tasks are paid, with rates reported up to $40 per hour depending on skills and experience. Be prepared for assignments requiring an uninterrupted hour, although many tasks are shorter. Entry includes a 10–15 minute skills assessment; flexible hours and remote participation are described.