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19 Prolific Front-End Developer Jobs Hiring Near You

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Infographic showing various Front-End Developer job openings at Prolific in the United States as of August 2026, with employment types broken down into 4% Internship, and 96% Full Time. Highlights an 22% Physical, and 78% Remote job distribution.

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

Prolific

Remote

$117K - $154K/yr

Full-time

Re-posted 18 days ago

Job description

Job Summary:
Prolific is building the biggest pool of quality human data in the world. They are seeking Senior HTML/CSS Developers to help train and evaluate cutting-edge AI models by reviewing AI-generated code and providing structured feedback.
Responsibilities:
• Evaluate Code Accuracy: review AI-generated HTML/CSS for functional correctness, semantic structure, and adherence to best practices.
• Validate Logic & Reasoning: audit the step-by-step explanations provided by AI for layout solutions and styling approaches to ensure they are technically sound.
• Conduct Execution Testing: render model-generated markup and stylesheets in appropriate environments to verify visual output and cross-browser behaviour.
• Annotate Model Performance: identify areas where a model produces inaccessible markup, inefficient selectors, deprecated attributes, or hallucinated CSS properties.
• Refine Technical Logic: provide structured feedback on how models reason through responsive design, component architecture, or design system implementation.
Qualifications:
Required:
• a BSc or higher in Computer Science, Software Engineering, Web Development, or a closely related technical field.
• real-world experience as a Senior Frontend Developer or UI Engineer specialising in HTML/CSS.
• ability to independently build complex, responsive layouts and components without relying on frameworks or libraries.
• expert understanding of the CSS cascade, specificity, the box model, Flexbox, CSS Grid, accessibility standards (WCAG), and cross-browser compatibility.
• a high standard for clean, semantic markup and maintainable CSS, including adherence to BEM methodology, design tokens, and modern CSS standards.
• expert mastery of HTML5 and CSS3/4, including custom properties, animations, and modern layout systems.
• extensive experience with Tailwind CSS, SASS/SCSS, or CSS Modules, and familiarity with component-driven design systems.
• proficiency with browser DevTools, accessibility auditing tools (e.g., axe, Lighthouse), and cross-browser testing platforms.
Company:
Building the most advanced global infrastructure for People Science. Founded in 2014, the company is headquartered in London, GBR, with a team of 51-200 employees. The company is currently Growth Stage.

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