Markup Ai

60 Markup Ai Jobs Hiring Near You

Optimize on-page SEO elements, including titles, meta descriptions, internal linking, schema markup, and content. * Create and optimize SEO/GEO-focused content for search engines and AI retrieval.

... AI engines heavily favour content less than 90 days old) Implement and QA schema markup (FAQPage, HowTo, VideoObject, CollectionPage) directly in Contentful -- ensuring schema is rendered in-page and ...

... markup, and knowledge graphs. What We Offer: - Competitive salary and benefits package ... AI strategy at a global brand. - Collaborative and innovative work environment. - Career ...

... AI engines heavily favour content less than 90 days old) Implement and QA schema markup (FAQPage, HowTo, VideoObject, CollectionPage) directly in Contentful -- ensuring schema is rendered in-page and ...

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Markup Ai Jobs Information

Infographic showing various job openings at Markup Ai in the United States as of August 2026, with employment types broken down into 100% Full Time. Highlights an 100% Physical job distribution.

Javascript - Senior Developers - AI Training - Philadelphia, USA

Prolific

Remote

Full-time

Re-posted 25 days ago


Job description

Job Summary:
Prolific is building the biggest pool of quality human data in the world, connecting researchers and organizations with paid study participants. They are seeking Senior HTML/CSS Developers to join their Expert Network to help train and evaluate cutting-edge AI models by reviewing and refining AI-generated code.
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:
• Educational Background: a BSc or higher in Computer Science, Software Engineering, Web Development, or a closely related technical field.
• Professional Experience: real-world experience as a Senior Frontend Developer or UI Engineer specialising in HTML/CSS.
• Coding Proficiency: ability to independently build complex, responsive layouts and components without relying on frameworks or libraries.
• Deep Domain Knowledge: expert understanding of the CSS cascade, specificity, the box model, Flexbox, CSS Grid, accessibility standards (WCAG), and cross-browser compatibility.
• Code Quality: a high standard for clean, semantic markup and maintainable CSS, including adherence to BEM methodology, design tokens, and modern CSS standards.
• Attention to Detail: ability to spot subtle rendering issues, accessibility violations, specificity conflicts, or deprecated/non-standard usage in model-generated code.
• Core Languages: expert mastery of HTML5 and CSS3/4, including custom properties, animations, and modern layout systems.
• Frameworks & Methodologies: extensive experience with Tailwind CSS, SASS/SCSS, or CSS Modules, and familiarity with component-driven design systems.
• Testing & Tools: proficiency with browser DevTools, accessibility auditing tools (e.g., axe, Lighthouse), and cross-browser testing platforms.
• Integration & API: strong understanding of how HTML/CSS interacts with JavaScript frameworks, CMS platforms, and design handoff tools such as Figma.
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.