HTML/CSS - Senior Developers - AI Training - Cambridge, UK

prolificacademicltd; United States; Remote; USD 39,000 - 55,000; Part time

Benefits offered by this job

Remote work

Flexible hours

Per-task payment

Job summary

Prolific Academic Ltd is seeking a senior frontend reviewer to evaluate AI-generated frontend code. You will assess markup, styles, and accessibility, render code across browsers, and provide structured feedback on responsive layouts and design system implementation.

Experience in HTML/CSS, responsive design, and modern CSS practices is required. Remote, flexible participation with payment per task and rates up to $40/hour based on skills and experience.

Qualifications

• BS degree or higher in CS, SE or related field.
• Senior frontend developer with HTML/CSS expertise.
• Ability to build complex responsive layouts without heavy frameworks.
• Expert on CSS cascade, specificity, box model, Flexbox, Grid, WCAG, and browser compatibility.
• Strong standards for semantic HTML and maintainable CSS (BEM, tokens).

Responsibilities

• Assess generated markup and styles for correctness and accessibility.
• Check explanations for layout and styling decisions.
• Render code and verify across browsers.
• Flag accessibility issues and outdated CSS.
• Provide feedback on responsive layouts and design system implementation.

Skills

Senior frontend

HTML & CSS

Responsive layouts

CSS fundamentals

Education

Bachelor's degree in CS/SE/Web

Tools

Tailwind CSS

Sass/SCSS

CSS Modules

Design tokens

Job description

Role overview

Contribute senior HTML and CSS expertise to the training and evaluation of AI systems that generate frontend code. This is a flexible, task-based participant opportunity: after a short skills assessment, you may be invited to review code, test rendered results, and give structured feedback. Tasks are paid, with rates set according to skills and experience; some require an uninterrupted hour, while many are shorter.

Responsibilities

• Assess generated markup and styles for correctness, semantic structure, and adherence to frontend best practices.
• Check the technical accuracy of explanations for layout and styling decisions.
• Render code and inspect its appearance and behaviour across browsers.
• Flag accessibility problems, inefficient selectors, outdated markup, and invalid or unsupported CSS.
• Provide clear feedback on responsive layouts, component structure, and design system implementation.

Requirements

• A bachelor’s degree or higher in computer science, software engineering, web development, or a related technical discipline.
• 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 standards for semantic HTML and maintainable CSS, including familiarity with BEM, design tokens, and current CSS practices.
• Mastery of HTML5 and modern CSS, including custom properties, animation, and current layout techniques.

Nice to have

• Experience with Tailwind CSS, Sass/SCSS, CSS Modules, and component-based design systems.
• Familiarity with browser developer tools, accessibility audit tools such as axe or Lighthouse, and cross-browser testing services.

Benefits and work setup

• Flexible, remote participation, subject to passing a 10-15 minute skills assessment.
• Researchers may offer rates of up to $40 per hour, depending on expertise and experience; this is not a guaranteed rate.