HTML/CSS - Senior Developers - AI Training - Washington DC, USA

Role overview

Apply senior HTML and CSS expertise to paid work that trains and evaluates AI systems. Tasks center on inspecting generated frontend code, verifying how it renders, and assessing whether the model’s implementation choices meet standards for usability, accessibility, and maintainability.

Responsibilities

- Evaluate generated markup and stylesheets for correctness, semantics, and adherence to good practice. - Check the technical reasoning behind proposed layouts and styling solutions. - Execute code and verify its visual output and behaviour in different browsers. - Spot inaccessible patterns, inefficient or brittle selectors, deprecated markup, and invalid CSS. - Write structured feedback about responsive design, component architecture, and design system implementation.

Requirements

- A bachelor’s degree or higher in computer science, software engineering, web development, or a related technical discipline. - Real-world experience as a senior frontend developer or UI engineer specializing in HTML and CSS. - Ability to implement complex responsive components and layouts without relying on frameworks or libraries. - Deep understanding of the CSS cascade, specificity, the box model, Flexbox, and CSS Grid. - Knowledge of accessibility standards and cross-browser compatibility, with a strong focus on clean semantic HTML and maintainable CSS. - Familiarity with modern HTML and CSS features, browser developer tools, and accessibility checks.

Nice to have

- Experience with Tailwind CSS, Sass/SCSS, CSS Modules, component-based design systems, or cross-browser testing tools.

Benefits and work setup

- Flexible remote participation follows a short skills assessment. - Paid assignments can require one uninterrupted hour, although many are shorter. Listed rates reach up to $40 per hour depending on skills and experience.