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

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

Benefits offered by this job

Remote work

Flexible hours

Skills assessment

Job summary

prolificacademic ltd seeks a senior frontend developer to contribute expertise on HTML and CSS for paid tasks that train AI systems. You will review generated code, explanations, and rendered results, providing structured feedback in a fast, focused environment.

You should be able to build complex responsive layouts, ensure semantic markup and accessible CSS, and work independently with minimal guidance in a remote setting.

Qualifications

• Bachelor's degree or higher in a related field.
• Senior frontend developer or UI engineer with focus on HTML/CSS.
• Ability to build complex responsive layouts and components independently, including without frameworks.
• Strong knowledge of CSS cascade, specificity, box model, Flexbox, Grid, accessibility standards, and browser compatibility.
• Skilled in semantic HTML and maintainable CSS, with familiarity with BEM and modern standards.

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 across browsers.
• Flag accessibility problems, inefficient selectors, deprecated markup, and invalid CSS.
• Provide feedback on responsive layouts, component structure, and design system reasoning.

Skills

HTML & CSS

Semantic HTML

CSS Architecture

Responsive layouts

Accessibility

Browser compatibility

Education

Bachelor's degree in CS or related field

Tools

Tailwind CSS

Sass/SCSS

CSS Modules

Design tokens

Job description

Role overview

Contribute senior frontend expertise to paid tasks that train and evaluate AI systems' ability to produce reliable HTML and CSS. Work involves reviewing generated code and explanations, checking rendered results, and giving structured feedback; tasks may require up to an hour of uninterrupted work.

Responsibilities

• Assess generated markup and styles for correctness, semantic structure, and maintainability.
• Check whether explanations of layout and styling decisions are technically sound.
• Render code and inspect its 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.

Requirements

• A bachelor's degree or higher in computer science, software engineering, web development, or a related 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, including without frameworks.
• Strong knowledge of the CSS cascade, specificity, box model, Flexbox, Grid, accessibility standards, and browser compatibility.
• Skilled in producing semantic HTML and maintainable CSS, with familiarity with BEM, design tokens, and modern standards.
• Proficiency with HTML5 and modern CSS, plus browser developer tools and accessibility or cross-browser testing tools.

Nice to have

• Experience with Tailwind CSS, Sass/SCSS, CSS Modules, or component-based design systems.
• Familiarity with CSS custom properties, animations, and modern layout techniques.

Benefits and work setup

• Remote participation with flexible hours; tasks vary in length, and some require an uninterrupted hour.
• Paid tasks may offer up to $40 per hour depending on skills and experience.
• Applicants complete a 10-15 minute skills assessment before being invited to participate.