Javascript - Senior Developers - AI Training - Chicago, USA

🏢 Summary: Paid opportunity for Senior HTML/CSS Developers to join an expert network and evaluate, test, and refine AI-generated frontend code. The role involves reviewing semantic structure, layout logic, accessibility, and cross-browser behavior to improve AI model performance. Candidates complete a short assessment and perform paid, task-based technical evaluations. 🗂️ Requirements: BSc or higher in Computer Science, Software Engineering, Web Development or related field, Senior-level professional experience in Frontend Development or UI Engineering, Expert-level proficiency in HTML and CSS, Ability to build complex responsive layouts without frameworks, Deep understanding of CSS cascade, specificity, box model, Flexbox, and Grid, Knowledge of WCAG accessibility standards, Experience ensuring cross-browser compatibility, Ability to write semantic, maintainable markup following BEM and modern CSS standards, Proficiency with browser DevTools and accessibility auditing tools 📃 Skills: HTML5, CSS3, CSS4, Flexbox, Grid, WCAG, BEM, Tailwind, SASS, SCSS, CSSModules, DevTools, axe, Lighthouse, Figma, JavaScript 🏢 Description: HTML/CSS - Senior Developers - AI Training About Prolific Prolific is not just another player in the AI space – we are building the biggest pool of quality human data in the world. Over 35,000 AI developers, researchers, and organizations use Prolific to gather data from paid study participants with a wide variety of experiences, knowledge, and skills. The role We're looking for Senior HTML/CSS Developers to join our Expert Network to help train and evaluate cutting-edge AI models. If you have a background in Software Engineering or Frontend Development, we'll send you a quick 10- to 15-minute test to assess your skills. If successful, you'll be invited to join Prolific as a participant, where you'll get paid to help AI understand and produce high-quality frontend code and design implementation. Researchers looking for your skills tend to pay up to $40/hr, depending on skills and experience. You must be prepared to complete paid tasks that require one hour of uninterrupted work, though many are shorter. What you'll bring 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 What you'll be doing in the role 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. Key Technologies 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. Why Prolific is a great platform to join as a Participant Joining our Expert Network will give you the chance to influence the AI models of the future using professional expertise. Once you pass our assessment, you can join Prolific in just 15 minutes, and start enjoying competitive pay rates, flexible hours, and the ability to work from home. We've built a unique platform that connects researchers and companies with a global pool of participants, enabling the collection of high-quality, ethically sourced human behavioural data and feedback. This data is the cornerstone of developing more accurate, nuanced, and aligned AI systems. We believe that the next leap in AI capabilities won't come solely from scaling existing models, but from integrating diverse human perspectives and behaviours into AI development. By providing this crucial human data infrastructure, Prolific is positioning itself at the forefront of the next wave of AI innovation – one that reflects the breadth and the best of humanity. Links & Privacy Website Youtube Privacy Statement By submitting your application, you agree that Prolific may collect your personal data for recruiting and global organisation planning. Prolific's Candidate Privacy Notice explains what personal information Prolific may process, where Prolific may process your personal information, its purposes for processing your personal information, and the rights you can exercise over Prolific's use of your personal information.

🏢 Summary: Paid opportunity for Senior HTML/CSS Developers to evaluate and train AI models by reviewing, testing, and improving AI-generated frontend code. The role involves assessing code accuracy, accessibility, responsiveness, and adherence to modern CSS standards. Participants complete technical tasks independently and provide structured feedback to enhance model reasoning and output quality. 🗂️ Requirements: BSc or higher in ComputerScience or related technical field, Senior-level experience in FrontendDevelopment or UIEngineering, Expert knowledge of HTML5 and CSS3/4, Ability to build complex responsive layouts without frameworks, Deep understanding of CSS cascade, specificity, box model, Flexbox, Grid, Knowledge of WCAG accessibility standards, Experience with cross-browser compatibility testing, Proficiency in clean semantic markup and maintainable CSS, Experience with BEM methodology and design systems, Ability to use browser DevTools and accessibility auditing tools 📃 Skills: HTML5, CSS3, CSS4, Flexbox, Grid, SASS, SCSS, Tailwind, CSSModules, BEM, WCAG, DevTools, Lighthouse, axe, Figma, JavaScript, CMS 🏢 Description: HTML/CSS - Senior Developers - AI Training About Prolific Prolific is not just another player in the AI space – we are building the biggest pool of quality human data in the world. Over 35,000 AI developers, researchers, and organizations use Prolific to gather data from paid study participants with a wide variety of experiences, knowledge, and skills. The role We're looking for Senior HTML/CSS Developers to join our Expert Network to help train and evaluate cutting-edge AI models. If you have a background in Software Engineering or Frontend Development, we'll send you a quick 10- to 15-minute test to assess your skills. If successful, you'll be invited to join Prolific as a participant, where you'll get paid to help AI understand and produce high-quality frontend code and design implementation. Researchers looking for your skills tend to pay up to $40/hr, depending on skills and experience. You must be prepared to complete paid tasks that require one hour of uninterrupted work, though many are shorter. What you'll bring 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 What you'll be doing in the role 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. Key Technologies 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. Why Prolific is a great platform to join as a Participant Joining our Expert Network will give you the chance to influence the AI models of the future using professional expertise. Once you pass our assessment, you can join Prolific in just 15 minutes, and start enjoying competitive pay rates, flexible hours, and the ability to work from home. We've built a unique platform that connects researchers and companies with a global pool of participants, enabling the collection of high-quality, ethically sourced human behavioural data and feedback. This data is the cornerstone of developing more accurate, nuanced, and aligned AI systems. We believe that the next leap in AI capabilities won't come solely from scaling existing models, but from integrating diverse human perspectives and behaviours into AI development. By providing this crucial human data infrastructure, Prolific is positioning itself at the forefront of the next wave of AI innovation – one that reflects the breadth and the best of humanity. Links & Privacy Website Youtube Privacy Statement By submitting your application, you agree that Prolific may collect your personal data for recruiting and global organisation planning. Prolific's Candidate Privacy Notice explains what personal information Prolific may process, where Prolific may process your personal information, its purposes for processing your personal information, and the rights you can exercise over Prolific's use of your personal information.

🏢 Summary: Paid expert role for Senior HTML/CSS Developers to train and evaluate AI models by reviewing, testing, and refining AI-generated frontend code and design implementations. The position involves assessing code quality, accessibility, responsiveness, and cross-browser behavior while providing structured technical feedback. Work is task-based with flexible hours and compensation based on expertise. 🗂️ Requirements: BSc or higher in Computer Science, Software Engineering, Web Development or related field, Senior-level professional experience in Frontend Development or UI Engineering focused on HTML/CSS, Ability to build complex responsive layouts without frameworks or libraries, Expert knowledge of CSS cascade, specificity, box model, Flexbox, and Grid, Strong understanding of accessibility standards and cross-browser compatibility, Experience with semantic markup and maintainable CSS methodologies (e.g., BEM, design tokens), Proficiency in reviewing, testing, and debugging HTML/CSS code, Ability to identify rendering issues, accessibility violations, and deprecated or non-standard code 📃 Skills: HTML5, CSS3, CSS4, Flexbox, Grid, WCAG, BEM, Tailwind, SASS, SCSS, CSSModules, DevTools, axe, Lighthouse, Figma 🏢 Description: HTML/CSS - Senior Developers - AI Training About Prolific Prolific is not just another player in the AI space – we are building the biggest pool of quality human data in the world. Over 35,000 AI developers, researchers, and organizations use Prolific to gather data from paid study participants with a wide variety of experiences, knowledge, and skills. The role We're looking for Senior HTML/CSS Developers to join our Expert Network to help train and evaluate cutting-edge AI models. If you have a background in Software Engineering or Frontend Development, we'll send you a quick 10- to 15-minute test to assess your skills. If successful, you'll be invited to join Prolific as a participant, where you'll get paid to help AI understand and produce high-quality frontend code and design implementation. Researchers looking for your skills tend to pay up to $40/hr, depending on skills and experience. You must be prepared to complete paid tasks that require one hour of uninterrupted work, though many are shorter. What you'll bring 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 What you'll be doing in the role 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. Key Technologies 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. Why Prolific is a great platform to join as a Participant Joining our Expert Network will give you the chance to influence the AI models of the future using professional expertise. Once you pass our assessment, you can join Prolific in just 15 minutes, and start enjoying competitive pay rates, flexible hours, and the ability to work from home. We've built a unique platform that connects researchers and companies with a global pool of participants, enabling the collection of high-quality, ethically sourced human behavioural data and feedback. This data is the cornerstone of developing more accurate, nuanced, and aligned AI systems. We believe that the next leap in AI capabilities won't come solely from scaling existing models, but from integrating diverse human perspectives and behaviours into AI development. By providing this crucial human data infrastructure, Prolific is positioning itself at the forefront of the next wave of AI innovation – one that reflects the breadth and the best of humanity. Links & Privacy Website Youtube Privacy Statement By submitting your application, you agree that Prolific may collect your personal data for recruiting and global organisation planning. Prolific's Candidate Privacy Notice explains what personal information Prolific may process, where Prolific may process your personal information, its purposes for processing your personal information, and the rights you can exercise over Prolific's use of your personal information.

🏢 Summary: Paid opportunity for Senior HTML/CSS Developers to join an expert network and train and evaluate AI models by reviewing, testing, and improving AI-generated frontend code. The role involves assessing code quality, validating technical reasoning, and ensuring accessibility and cross-browser compatibility. Work is task-based, remote, and focused on high-quality HTML/CSS implementation without reliance on frameworks. 🗂️ Requirements: BSc or higher in Computer Science, Software Engineering, Web Development, or related field, Professional experience as Senior Frontend Developer or UI Engineer specializing in HTML/CSS, Ability to build complex, responsive layouts without frameworks or libraries, Expert knowledge of CSS cascade, specificity, box model, Flexbox, and CSS Grid, Strong understanding of accessibility standards (WCAG) and cross-browser compatibility, Experience writing clean, semantic HTML and maintainable CSS using BEM and modern standards, Proficiency with browser DevTools and accessibility auditing tools, Ability to test and validate rendering across browsers 📃 Skills: HTML5, CSS3, CSS4, Flexbox, Grid, WCAG, BEM, Tailwind, SASS, SCSS, CSSModules, DevTools, Lighthouse, axe, Figma 🏢 Description: HTML/CSS - Senior Developers - AI Training About Prolific Prolific is not just another player in the AI space – we are building the biggest pool of quality human data in the world. Over 35,000 AI developers, researchers, and organizations use Prolific to gather data from paid study participants with a wide variety of experiences, knowledge, and skills. The role We're looking for Senior HTML/CSS Developers to join our Expert Network to help train and evaluate cutting-edge AI models. If you have a background in Software Engineering or Frontend Development, we'll send you a quick 10- to 15-minute test to assess your skills. If successful, you'll be invited to join Prolific as a participant, where you'll get paid to help AI understand and produce high-quality frontend code and design implementation. Researchers looking for your skills tend to pay up to $40/hr, depending on skills and experience. You must be prepared to complete paid tasks that require one hour of uninterrupted work, though many are shorter. What you'll bring 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 What you'll be doing in the role 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. Key Technologies 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. Why Prolific is a great platform to join as a Participant Joining our Expert Network will give you the chance to influence the AI models of the future using professional expertise. Once you pass our assessment, you can join Prolific in just 15 minutes, and start enjoying competitive pay rates, flexible hours, and the ability to work from home. We've built a unique platform that connects researchers and companies with a global pool of participants, enabling the collection of high-quality, ethically sourced human behavioural data and feedback. This data is the cornerstone of developing more accurate, nuanced, and aligned AI systems. We believe that the next leap in AI capabilities won't come solely from scaling existing models, but from integrating diverse human perspectives and behaviours into AI development. By providing this crucial human data infrastructure, Prolific is positioning itself at the forefront of the next wave of AI innovation – one that reflects the breadth and the best of humanity. Links & Privacy Website Youtube Privacy Statement By submitting your application, you agree that Prolific may collect your personal data for recruiting and global organisation planning. Prolific's Candidate Privacy Notice explains what personal information Prolific may process, where Prolific may process your personal information, its purposes for processing your personal information, and the rights you can exercise over Prolific's use of your personal information.

🏢 Summary: Opportunity for Senior HTML/CSS Developers to join an expert network supporting AI model training by evaluating and improving AI-generated frontend code. The role involves reviewing, testing, and annotating HTML/CSS outputs to ensure accuracy, accessibility, and adherence to best practices. It offers paid, flexible, task-based work focused on high-quality frontend implementation. 🗂️ Requirements: BSc or higher in Computer Science, Software Engineering, Web Development or related field, Senior-level professional experience in Frontend Development or UI Engineering specializing in HTML/CSS, Ability to build complex, responsive layouts without frameworks or libraries, Expert knowledge of CSS cascade, specificity, box model, Flexbox, CSS Grid, accessibility standards and cross-browser compatibility, Experience writing clean, semantic HTML and maintainable CSS using modern standards and BEM methodology, Proficiency using browser DevTools and accessibility auditing tools, Ability to test and validate cross-browser rendering and visual output 📃 Skills: HTML5, CSS3, CSS4, Flexbox, Grid, WCAG, BEM, Tailwind, SASS, SCSS, CSSModules, DevTools, axe, Lighthouse, Figma 🏢 Description: HTML/CSS - Senior Developers - AI Training About Prolific Prolific is not just another player in the AI space – we are building the biggest pool of quality human data in the world. Over 35,000 AI developers, researchers, and organizations use Prolific to gather data from paid study participants with a wide variety of experiences, knowledge, and skills. The role We're looking for Senior HTML/CSS Developers to join our Expert Network to help train and evaluate cutting-edge AI models. If you have a background in Software Engineering or Frontend Development, we'll send you a quick 10- to 15-minute test to assess your skills. If successful, you'll be invited to join Prolific as a participant, where you'll get paid to help AI understand and produce high-quality frontend code and design implementation. Researchers looking for your skills tend to pay up to $40/hr, depending on skills and experience. You must be prepared to complete paid tasks that require one hour of uninterrupted work, though many are shorter. What you'll bring 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 What you'll be doing in the role 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. Key Technologies 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. Why Prolific is a great platform to join as a Participant Joining our Expert Network will give you the chance to influence the AI models of the future using professional expertise. Once you pass our assessment, you can join Prolific in just 15 minutes, and start enjoying competitive pay rates, flexible hours, and the ability to work from home. We've built a unique platform that connects researchers and companies with a global pool of participants, enabling the collection of high-quality, ethically sourced human behavioural data and feedback. This data is the cornerstone of developing more accurate, nuanced, and aligned AI systems. We believe that the next leap in AI capabilities won't come solely from scaling existing models, but from integrating diverse human perspectives and behaviours into AI development. By providing this crucial human data infrastructure, Prolific is positioning itself at the forefront of the next wave of AI innovation – one that reflects the breadth and the best of humanity. Links & Privacy Website Youtube Privacy Statement By submitting your application, you agree that Prolific may collect your personal data for recruiting and global organisation planning. Prolific's Candidate Privacy Notice explains what personal information Prolific may process, where Prolific may process your personal information, its purposes for processing your personal information, and the rights you can exercise over Prolific's use of your personal information.

🏢 Summary: Opportunity for Senior HTML/CSS Developers to join an expert network supporting AI training by evaluating, testing, and improving AI-generated frontend code. The role involves reviewing markup and styles for accuracy, accessibility, and best practices, and providing structured technical feedback. It is a paid, flexible engagement focused on high-quality frontend code and design implementation. 🗂️ Requirements: BSc or higher in Computer Science, Software Engineering, Web Development or related field, Professional experience as Senior Frontend Developer or UI Engineer, Expert-level proficiency in HTML and CSS, Ability to build complex responsive layouts without frameworks, Deep knowledge of CSS cascade, specificity, box model, Flexbox, CSS Grid, Strong understanding of WCAG accessibility standards, Experience ensuring cross-browser compatibility, Ability to write semantic, maintainable CSS using BEM and modern standards, Proficiency with browser DevTools and accessibility auditing tools 📃 Skills: HTML5, CSS3, CSS4, Flexbox, Grid, SASS, SCSS, Tailwind, BEM, WCAG, DevTools, Lighthouse, axe, Figma, CSSModules 🏢 Description: HTML/CSS - Senior Developers - AI Training About Prolific Prolific is not just another player in the AI space – we are building the biggest pool of quality human data in the world. Over 35,000 AI developers, researchers, and organizations use Prolific to gather data from paid study participants with a wide variety of experiences, knowledge, and skills. The role We're looking for Senior HTML/CSS Developers to join our Expert Network to help train and evaluate cutting-edge AI models. If you have a background in Software Engineering or Frontend Development, we'll send you a quick 10- to 15-minute test to assess your skills. If successful, you'll be invited to join Prolific as a participant, where you'll get paid to help AI understand and produce high-quality frontend code and design implementation. Researchers looking for your skills tend to pay up to $40/hr, depending on skills and experience. You must be prepared to complete paid tasks that require one hour of uninterrupted work, though many are shorter. What you'll bring 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 What you'll be doing in the role 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. Key Technologies 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. Why Prolific is a great platform to join as a Participant Joining our Expert Network will give you the chance to influence the AI models of the future using professional expertise. Once you pass our assessment, you can join Prolific in just 15 minutes, and start enjoying competitive pay rates, flexible hours, and the ability to work from home. We've built a unique platform that connects researchers and companies with a global pool of participants, enabling the collection of high-quality, ethically sourced human behavioural data and feedback. This data is the cornerstone of developing more accurate, nuanced, and aligned AI systems. We believe that the next leap in AI capabilities won't come solely from scaling existing models, but from integrating diverse human perspectives and behaviours into AI development. By providing this crucial human data infrastructure, Prolific is positioning itself at the forefront of the next wave of AI innovation – one that reflects the breadth and the best of humanity. Links & Privacy Website Youtube Privacy Statement By submitting your application, you agree that Prolific may collect your personal data for recruiting and global organisation planning. Prolific's Candidate Privacy Notice explains what personal information Prolific may process, where Prolific may process your personal information, its purposes for processing your personal information, and the rights you can exercise over Prolific's use of your personal information.

🏢 Summary: Paid opportunity for Senior HTML/CSS Developers to join an expert network and evaluate, test, and refine AI-generated frontend code. The role involves assessing code quality, accessibility, responsiveness, and cross-browser behavior, and providing structured technical feedback to improve AI models. Work is task-based with flexible hours following a successful skills assessment. 🗂️ Requirements: BSc or higher in Computer Science, Software Engineering, Web Development or related field, Professional experience as Senior Frontend Developer or UI Engineer specializing in HTML/CSS, Ability to build complex responsive layouts without frameworks, Expert knowledge of CSS cascade, specificity, box model, Flexbox, CSS Grid, Strong understanding of WCAG accessibility standards, Experience ensuring cross-browser compatibility, Ability to write clean semantic HTML and maintainable CSS, Experience with BEM methodology and modern CSS standards, Proficiency using browser DevTools and accessibility auditing tools 📃 Skills: HTML5, CSS3, CSS4, Flexbox, Grid, WCAG, BEM, Tailwind, SASS, SCSS, CSSModules, DevTools, axe, Lighthouse, Figma 🏢 Description: HTML/CSS - Senior Developers - AI Training About Prolific Prolific is not just another player in the AI space – we are building the biggest pool of quality human data in the world. Over 35,000 AI developers, researchers, and organizations use Prolific to gather data from paid study participants with a wide variety of experiences, knowledge, and skills. The role We're looking for Senior HTML/CSS Developers to join our Expert Network to help train and evaluate cutting-edge AI models. If you have a background in Software Engineering or Frontend Development, we'll send you a quick 10- to 15-minute test to assess your skills. If successful, you'll be invited to join Prolific as a participant, where you'll get paid to help AI understand and produce high-quality frontend code and design implementation. Researchers looking for your skills tend to pay up to $40/hr, depending on skills and experience. You must be prepared to complete paid tasks that require one hour of uninterrupted work, though many are shorter. What you'll bring 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 What you'll be doing in the role 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. Key Technologies 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. Why Prolific is a great platform to join as a Participant Joining our Expert Network will give you the chance to influence the AI models of the future using professional expertise. Once you pass our assessment, you can join Prolific in just 15 minutes, and start enjoying competitive pay rates, flexible hours, and the ability to work from home. We've built a unique platform that connects researchers and companies with a global pool of participants, enabling the collection of high-quality, ethically sourced human behavioural data and feedback. This data is the cornerstone of developing more accurate, nuanced, and aligned AI systems. We believe that the next leap in AI capabilities won't come solely from scaling existing models, but from integrating diverse human perspectives and behaviours into AI development. By providing this crucial human data infrastructure, Prolific is positioning itself at the forefront of the next wave of AI innovation – one that reflects the breadth and the best of humanity. Links & Privacy Website Youtube Privacy Statement By submitting your application, you agree that Prolific may collect your personal data for recruiting and global organisation planning. Prolific's Candidate Privacy Notice explains what personal information Prolific may process, where Prolific may process your personal information, its purposes for processing your personal information, and the rights you can exercise over Prolific's use of your personal information.

🏢 Summary: Opportunity for Senior HTML/CSS Developers to join an expert network supporting AI model training by evaluating and improving AI-generated frontend code. The role involves reviewing, testing, and annotating HTML/CSS outputs to ensure technical accuracy, accessibility, and best practices. Flexible, paid tasks focus on high-quality frontend implementation and code standards. 🗂️ Requirements: BSc or higher in Computer Science, Software Engineering, Web Development, or related field, Senior-level professional experience in Frontend Development or UI Engineering with HTML/CSS specialization, Ability to build complex, responsive layouts without frameworks or libraries, Expert knowledge of CSS cascade, specificity, box model, Flexbox, CSS Grid, accessibility standards, and cross-browser compatibility, Experience maintaining clean, semantic HTML and scalable CSS using modern standards and methodologies, Proficiency using browser developer tools and accessibility auditing tools, Ability to test and validate cross-browser rendering and visual output accuracy 📃 Skills: HTML5, CSS3, CSS4, Flexbox, CSSGrid, WCAG, BEM, Tailwind, SASS, SCSS, CSSModules, DevTools, axe, Lighthouse, Figma, JavaScript, CMS 🏢 Description: HTML/CSS - Senior Developers - AI Training About Prolific Prolific is not just another player in the AI space – we are building the biggest pool of quality human data in the world. Over 35,000 AI developers, researchers, and organizations use Prolific to gather data from paid study participants with a wide variety of experiences, knowledge, and skills. The role We're looking for Senior HTML/CSS Developers to join our Expert Network to help train and evaluate cutting-edge AI models. If you have a background in Software Engineering or Frontend Development, we'll send you a quick 10- to 15-minute test to assess your skills. If successful, you'll be invited to join Prolific as a participant, where you'll get paid to help AI understand and produce high-quality frontend code and design implementation. Researchers looking for your skills tend to pay up to $40/hr, depending on skills and experience. You must be prepared to complete paid tasks that require one hour of uninterrupted work, though many are shorter. What you'll bring 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 What you'll be doing in the role 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. Key Technologies 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. Why Prolific is a great platform to join as a Participant Joining our Expert Network will give you the chance to influence the AI models of the future using professional expertise. Once you pass our assessment, you can join Prolific in just 15 minutes, and start enjoying competitive pay rates, flexible hours, and the ability to work from home. We've built a unique platform that connects researchers and companies with a global pool of participants, enabling the collection of high-quality, ethically sourced human behavioural data and feedback. This data is the cornerstone of developing more accurate, nuanced, and aligned AI systems. We believe that the next leap in AI capabilities won't come solely from scaling existing models, but from integrating diverse human perspectives and behaviours into AI development. By providing this crucial human data infrastructure, Prolific is positioning itself at the forefront of the next wave of AI innovation – one that reflects the breadth and the best of humanity. Links & Privacy Website Youtube Privacy Statement By submitting your application, you agree that Prolific may collect your personal data for recruiting and global organisation planning. Prolific's Candidate Privacy Notice explains what personal information Prolific may process, where Prolific may process your personal information, its purposes for processing your personal information, and the rights you can exercise over Prolific's use of your personal information.

🏢 Summary: Paid opportunity for Senior HTML/CSS Developers to evaluate and improve AI-generated frontend code by reviewing, testing, and providing structured feedback on layout, styling, and accessibility. The role involves validating technical accuracy, cross-browser behavior, and adherence to modern frontend best practices. Participants complete assessment-based tasks and contribute to training advanced AI models. 🗂️ Requirements: BSc or higher in Computer Science, Software Engineering, Web Development, or related field, Professional experience as Senior Frontend Developer or UI Engineer specializing in HTML/CSS, Ability to build complex responsive layouts without frameworks, Expert knowledge of CSS cascade, specificity, box model, Flexbox, and Grid, Strong understanding of WCAG accessibility standards, Experience ensuring cross-browser compatibility, Ability to write semantic, maintainable markup using BEM and modern CSS standards, Proficiency in reviewing and testing frontend code for accuracy and best practices 📃 Skills: HTML5, CSS3, CSS4, Flexbox, Grid, SASS, SCSS, Tailwind, BEM, WCAG, DevTools, Lighthouse, axe, Figma, CMS 🏢 Description: HTML/CSS - Senior Developers - AI Training About Prolific Prolific is not just another player in the AI space – we are building the biggest pool of quality human data in the world. Over 35,000 AI developers, researchers, and organizations use Prolific to gather data from paid study participants with a wide variety of experiences, knowledge, and skills. The role We're looking for Senior HTML/CSS Developers to join our Expert Network to help train and evaluate cutting-edge AI models. If you have a background in Software Engineering or Frontend Development, we'll send you a quick 10- to 15-minute test to assess your skills. If successful, you'll be invited to join Prolific as a participant, where you'll get paid to help AI understand and produce high-quality frontend code and design implementation. Researchers looking for your skills tend to pay up to $40/hr, depending on skills and experience. You must be prepared to complete paid tasks that require one hour of uninterrupted work, though many are shorter. What you'll bring 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 What you'll be doing in the role 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. Key Technologies 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. Why Prolific is a great platform to join as a Participant Joining our Expert Network will give you the chance to influence the AI models of the future using professional expertise. Once you pass our assessment, you can join Prolific in just 15 minutes, and start enjoying competitive pay rates, flexible hours, and the ability to work from home. We've built a unique platform that connects researchers and companies with a global pool of participants, enabling the collection of high-quality, ethically sourced human behavioural data and feedback. This data is the cornerstone of developing more accurate, nuanced, and aligned AI systems. We believe that the next leap in AI capabilities won't come solely from scaling existing models, but from integrating diverse human perspectives and behaviours into AI development. By providing this crucial human data infrastructure, Prolific is positioning itself at the forefront of the next wave of AI innovation – one that reflects the breadth and the best of humanity. Links & Privacy Website Youtube Privacy Statement By submitting your application, you agree that Prolific may collect your personal data for recruiting and global organisation planning. Prolific's Candidate Privacy Notice explains what personal information Prolific may process, where Prolific may process your personal information, its purposes for processing your personal information, and the rights you can exercise over Prolific's use of your personal information.

🏢 Summary: Paid opportunity for Senior HTML/CSS Developers to join an expert network and evaluate, test, and refine AI-generated frontend code. The role involves assessing code quality, accessibility, and layout logic while providing structured feedback to improve AI models. Work is task-based with flexible hours and competitive hourly compensation. 🗂️ Requirements: BSc or higher in Computer Science, Software Engineering, Web Development, or related field, Senior-level professional experience in Frontend Development or UI Engineering focused on HTML/CSS, Ability to build complex, responsive layouts without frameworks or libraries, Expert knowledge of CSS cascade, specificity, box model, Flexbox, CSS Grid, and WCAG standards, Experience writing clean, semantic HTML and maintainable CSS using BEM and modern standards, Proficiency in cross-browser testing and identifying rendering and accessibility issues 📃 Skills: HTML5, CSS3, CSS4, Flexbox, Grid, WCAG, BEM, Tailwind, SASS, SCSS, CSSModules, DevTools, axe, Lighthouse, Figma 🏢 Description: HTML/CSS - Senior Developers - AI Training About Prolific Prolific is not just another player in the AI space – we are building the biggest pool of quality human data in the world. Over 35,000 AI developers, researchers, and organizations use Prolific to gather data from paid study participants with a wide variety of experiences, knowledge, and skills. The role We're looking for Senior HTML/CSS Developers to join our Expert Network to help train and evaluate cutting-edge AI models. If you have a background in Software Engineering or Frontend Development, we'll send you a quick 10- to 15-minute test to assess your skills. If successful, you'll be invited to join Prolific as a participant, where you'll get paid to help AI understand and produce high-quality frontend code and design implementation. Researchers looking for your skills tend to pay up to $40/hr, depending on skills and experience. You must be prepared to complete paid tasks that require one hour of uninterrupted work, though many are shorter. What you'll bring 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 What you'll be doing in the role 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. Key Technologies 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. Why Prolific is a great platform to join as a Participant Joining our Expert Network will give you the chance to influence the AI models of the future using professional expertise. Once you pass our assessment, you can join Prolific in just 15 minutes, and start enjoying competitive pay rates, flexible hours, and the ability to work from home. We've built a unique platform that connects researchers and companies with a global pool of participants, enabling the collection of high-quality, ethically sourced human behavioural data and feedback. This data is the cornerstone of developing more accurate, nuanced, and aligned AI systems. We believe that the next leap in AI capabilities won't come solely from scaling existing models, but from integrating diverse human perspectives and behaviours into AI development. By providing this crucial human data infrastructure, Prolific is positioning itself at the forefront of the next wave of AI innovation – one that reflects the breadth and the best of humanity. Links & Privacy Website Youtube Privacy Statement By submitting your application, you agree that Prolific may collect your personal data for recruiting and global organisation planning. Prolific's Candidate Privacy Notice explains what personal information Prolific may process, where Prolific may process your personal information, its purposes for processing your personal information, and the rights you can exercise over Prolific's use of your personal information.