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

Role overview Use senior frontend skills to help train and assess AI systems that produce HTML and CSS. Assignments involve evaluating generated code and its reasoning, checking how it renders, and documenting technical strengths and shortcomings. Participation follows a brief skills assessment, and work is offered as paid tasks that can be completed remotely and flexibly.

Responsibilities - Review generated HTML and CSS for functional accuracy, semantic structure, and sound coding practice. - Audit the model’s explanations of layout and styling choices for technical validity. - Run markup and stylesheets in a browser to assess appearance and cross-browser behaviour. - Identify inaccessible output, inefficient selectors, deprecated markup, and unsupported CSS. - Provide clear feedback on responsive design, component organisation, and design system implementation.

Requirements - Bachelor’s degree or higher in computer science, software engineering, web development, or a related technical discipline. - Real-world experience in a senior frontend or UI engineering role with an HTML/CSS specialism. - Confidence building complex responsive interfaces and components without relying on frameworks or libraries. - Expert knowledge of the CSS cascade, specificity, box model, Flexbox, Grid, WCAG accessibility, and cross-browser support. - Ability to produce and judge clean semantic markup and maintainable CSS, including BEM conventions and design tokens. - Deep familiarity with HTML5 and modern CSS features such as custom properties, animations, and contemporary layout systems.

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

Benefits and work setup - Flexible, remote paid work, with advertised task rates up to $40 per hour depending on expertise. - A 10 to 15 minute assessment is required before access to tasks; some assignments need an uninterrupted hour, while others are shorter.