Senior Frontend Engineer - HTML/CSS Quality (Remote)

prolificacademicltd; United States; Remote; USD 45,000 - 65,000; Full time

Job summary

Prolific Academic Ltd is seeking a senior frontend developer focused on HTML and CSS to contribute to paid tasks training AI systems. You will review generated markup, explain layout decisions, and ensure accessibility and cross-browser compatibility.

Remote role with flexible hours; responsibilities include building responsive components, validating CSS, and providing structured feedback on code quality. Up to $40 per hour based on skills and experience.

Qualifications

• Bachelor's degree or higher in CS, software engineering, web development, or related field.
• Experience as a senior frontend developer/UI engineer focused on HTML/CSS.
• Ability to build complex responsive layouts and components without frameworks.
• Strong knowledge of CSS cascade, specificity, box model, Flexbox, Grid, accessibility, and browser compatibility.
• Proficiency with HTML5 and modern CSS, plus browser dev tools and accessibility tests.

Responsibilities

• Assess generated markup and styles for correctness, semantic structure, and maintainability.
• Check explanations of layout and styling decisions for technical soundness.
• Render code and inspect appearance and behavior across browsers.
• Flag accessibility problems, inefficient selectors, deprecated markup, and invalid CSS.
• Give feedback on responsive layouts, component structure, and design system reasoning.

Skills

HTML & CSS

Responsive layouts

Accessibility standards

Cross-browser testing

Design systems familiarity

Education

Bachelor's degree in CS or related field

Tools

Browser DevTools

Tailwind CSS

Sass/SCSS

CSS Modules

BEM methodology

Job description

Prolific Academic Ltd is seeking a senior frontend developer focused on HTML and CSS to contribute to paid tasks training AI systems. You will review generated markup, explain layout decisions, and ensure accessibility and cross-browser compatibility.

Remote role with flexible hours; responsibilities include building responsive components, validating CSS, and providing structured feedback on code quality. Up to $40 per hour based on skills and experience.