HTML/CSS - Senior Developers - AI Training - US

🏢 Summary: Paid opportunity for Senior HTML/CSS Developers to join an expert network and evaluate, test, and provide feedback on AI-generated frontend code to improve model performance. The role involves reviewing code quality, validating technical reasoning, and ensuring accessibility and cross-browser compatibility. Flexible, remote work with hourly 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 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, Strong understanding of accessibility standards (WCAG) and cross-browser compatibility, Experience with clean semantic markup and maintainable CSS methodologies (e.g., BEM, design tokens), Proficiency with browser DevTools and accessibility auditing tools 📃 Skills: HTML5, CSS3, CSS4, Flexbox, CSSGrid, WCAG, BEM, Tailwind, SASS, SCSS, CSSModules, DevTools, Lighthouse, axe 🏢 Description: HTML/CSS - Senior Developers - AI Training - US 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. 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. Why Prolific is a great platform to join as a Participant Joining our platform as a Prolific participant will give you the chance to influence the AI models of the future using professional legal 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 to more information on Prolific 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 use of your personal personal information.

🏢 Summary: Opportunity for Senior HTML/CSS Developers to join an AI training network, evaluating and improving AI-generated frontend code and design implementations. The role involves reviewing, testing, and annotating HTML/CSS outputs to ensure technical accuracy, accessibility, and adherence to best practices. Participants complete paid technical tasks to enhance AI understanding of modern frontend development. 🗂️ Requirements: BSc or higher in ComputerScience, SoftwareEngineering, WebDevelopment or related field, Senior-level experience in FrontendDevelopment or UIEngineering, Expert proficiency in HTML5 and CSS3/4, Ability to build complex responsive layouts without frameworks, Deep knowledge of CSS cascade, specificity, box model, Flexbox, Grid, Strong understanding of WCAG accessibility standards, Experience ensuring cross-browser compatibility, Ability to maintain clean semantic markup and structured CSS using BEM or design systems, Proficiency with DevTools and accessibility auditing tools 📃 Skills: HTML5, CSS3, CSS4, Flexbox, Grid, WCAG, BEM, Tailwind, SASS, SCSS, CSSModules, DevTools, Lighthouse, axe 🏢 Description: HTML/CSS - Senior Developers - AI Training - US 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. 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. Why Prolific is a great platform to join as a Participant Joining our platform as a Prolific participant will give you the chance to influence the AI models of the future using professional legal 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 to more information on Prolific 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 use of your personal personal information.

🏢 Summary: Opportunity for Senior HTML/CSS Developers to join an AI training network, evaluating and improving AI-generated frontend code and design implementations. The role involves reviewing, testing, and annotating HTML/CSS outputs to ensure accuracy, accessibility, and adherence to modern best practices. Work is project-based and focused on high-quality frontend code validation. 🗂️ 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 knowledge of CSS cascade, specificity, box model, Flexbox and Grid, Strong understanding of WCAG accessibility standards, Experience ensuring cross-browser compatibility, Ability to maintain clean semantic markup and structured CSS (BEM, design tokens), Proficiency with browser DevTools and accessibility auditing tools 📃 Skills: HTML5, CSS3, CSS4, Flexbox, Grid, WCAG, BEM, Tailwind, SASS, SCSS, CSSModules, DevTools, Lighthouse, axe 🏢 Description: HTML/CSS - Senior Developers - AI Training - US 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. 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. Why Prolific is a great platform to join as a Participant Joining our platform as a Prolific participant will give you the chance to influence the AI models of the future using professional legal 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 to more information on Prolific 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 use of your personal personal information.

🏢 Summary: Paid opportunity for Senior HTML/CSS Developers to join an AI Expert Network, evaluating and improving AI-generated frontend code and design implementations. The role focuses on reviewing, testing, and annotating HTML/CSS outputs to ensure technical accuracy, accessibility, and adherence to best practices. Work is task-based, remote, and compensated hourly after passing a technical assessment. 🗂️ 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, and CSS Grid, Strong understanding of WCAG accessibility standards, Experience ensuring cross-browser compatibility, Ability to produce clean semantic HTML and maintainable CSS following BEM and modern standards, Proficiency with Tailwind CSS, SASS/SCSS or CSS Modules, Experience with browser DevTools and accessibility auditing tools 📃 Skills: HTML5, CSS3, CSS4, Flexbox, Grid, WCAG, BEM, Tailwind, SASS, SCSS, CSSModules, DevTools, Lighthouse, axe 🏢 Description: HTML/CSS - Senior Developers - AI Training - US 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. 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. Why Prolific is a great platform to join as a Participant Joining our platform as a Prolific participant will give you the chance to influence the AI models of the future using professional legal 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 to more information on Prolific 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 use of your personal personal information.

🏢 Summary: Paid remote opportunity for Senior HTML/CSS Developers to evaluate and train AI models by reviewing, testing, and improving AI-generated frontend code and design implementations. The role involves assessing code quality, validating technical reasoning, and ensuring accessibility and cross-browser compatibility. Participants complete structured technical tasks and are compensated hourly. 🗂️ 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, Strong understanding of accessibility standards (WCAG) and cross-browser compatibility, Experience with semantic markup and maintainable CSS methodologies (e.g., BEM, design tokens), Proficiency in rendering and testing HTML/CSS across browsers and environments 📃 Skills: HTML5, CSS3, CSS4, Flexbox, CSSGrid, SASS, SCSS, Tailwind, CSSModules, BEM, WCAG, DevTools, Lighthouse, axe 🏢 Description: HTML/CSS - Senior Developers - AI Training - US 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. 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. Why Prolific is a great platform to join as a Participant Joining our platform as a Prolific participant will give you the chance to influence the AI models of the future using professional legal 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 to more information on Prolific 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 use of your personal personal information.

🏢 Summary: Paid opportunity for Senior HTML/CSS Developers to join an expert network supporting AI 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. Participants complete paid assessment tasks and ongoing assignments focused on high-quality frontend implementation. 🗂️ 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 and cross-browser compatibility, Experience producing clean semantic HTML and maintainable CSS using BEM and modern standards, Availability to complete focused one-hour paid tasks 📃 Skills: HTML5, CSS3, CSS4, Flexbox, Grid, WCAG, BEM, Tailwind, SASS, SCSS, CSSModules, DevTools, Lighthouse, axe 🏢 Description: HTML/CSS - Senior Developers - AI Training - USA 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. 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. Why Prolific is a great platform to join as a Participant Joining our platform as a Prolific participant will give you the chance to influence the AI models of the future using professional legal 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 to more information on Prolific 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 use of your personal personal information.

🏢 Summary: 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. Participants complete paid technical tasks focused on advanced HTML/CSS implementation and best practices. 🗂️ Requirements: BSc or higher in Computer Science, Software Engineering, Web Development or related field, Senior-level experience in Frontend Development or UI Engineering, Expert-level proficiency in HTML and CSS, Ability to build complex responsive layouts without frameworks, Deep knowledge of CSS cascade, specificity, box model, Flexbox, Grid, Strong understanding of accessibility standards (WCAG), Experience with cross-browser compatibility and testing, Ability to review and validate code for semantic structure and best practices, Proficiency with browser DevTools and accessibility auditing tools 📃 Skills: HTML5, CSS3, CSS4, Flexbox, Grid, WCAG, BEM, Tailwind, SASS, SCSS, CSSModules, DevTools, Lighthouse, axe 🏢 Description: HTML/CSS - Senior Developers - AI Training - USA 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. 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. Why Prolific is a great platform to join as a Participant Joining our platform as a Prolific participant will give you the chance to influence the AI models of the future using professional legal 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 to more information on Prolific 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 use of your personal personal information.

🏢 Summary: Paid opportunity for Senior HTML/CSS Developers to join an expert network and train AI models by evaluating, testing, and improving AI-generated frontend code. The role involves reviewing markup and styles for correctness, accessibility, responsiveness, and cross-browser compatibility. Candidates complete technical assessments and perform structured evaluation tasks on an hourly basis. 🗂️ 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 knowledge of CSS cascade, specificity and box model, Strong understanding of Flexbox and CSS Grid, Knowledge of WCAG accessibility standards, Experience with cross-browser compatibility testing, Ability to maintain semantic markup and structured CSS methodologies 📃 Skills: HTML5, CSS3, CSS4, Flexbox, Grid, WCAG, BEM, Tailwind, SASS, SCSS, CSSModules, DevTools, Lighthouse, axe, Animations, DesignTokens 🏢 Description: HTML/CSS - Senior Developers - AI Training - USA 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. 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. Why Prolific is a great platform to join as a Participant Joining our platform as a Prolific participant will give you the chance to influence the AI models of the future using professional legal 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 to more information on Prolific 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 use of your personal personal information.

🏢 Summary: Paid remote opportunity for Senior HTML/CSS Developers to support AI model training by evaluating, testing, and annotating AI-generated frontend code and design implementations. The role involves reviewing code quality, validating technical reasoning, and ensuring accessibility and cross-browser compatibility. Candidates complete an assessment and, if successful, perform hourly paid tasks focused on frontend 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, Expert knowledge of CSS cascade, specificity, box model, Flexbox, Grid, Strong understanding of WCAG accessibility standards, Experience ensuring cross-browser compatibility, Ability to maintain clean semantic markup and structured CSS (BEM, design tokens), Availability to complete uninterrupted one-hour paid tasks 📃 Skills: HTML5, CSS3, CSS4, Flexbox, Grid, WCAG, BEM, Tailwind, SASS, SCSS, CSSModules, DevTools, Lighthouse, axe 🏢 Description: HTML/CSS - Senior Developers - AI Training - USA 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. 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. Why Prolific is a great platform to join as a Participant Joining our platform as a Prolific participant will give you the chance to influence the AI models of the future using professional legal 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 to more information on Prolific 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 use of your personal personal information.

🏢 Summary: Paid opportunity for Senior HTML/CSS Developers to join an expert network and contribute to training and evaluating AI models by reviewing, testing, and refining AI-generated frontend code. The role involves assessing code quality, validating technical reasoning, and ensuring accessibility and cross-browser compatibility. Work is task-based, fully remote, and compensated hourly. 🗂️ 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 produce clean semantic HTML and maintainable CSS, Familiarity with BEM methodology and modern CSS standards, Proficiency with browser DevTools and accessibility auditing tools 📃 Skills: HTML5, CSS3, CSS4, Flexbox, Grid, SASS, SCSS, Tailwind, CSSModules, BEM, WCAG, DevTools, Lighthouse, axe 🏢 Description: HTML/CSS - Senior Developers - AI Training - USA 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. 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. Why Prolific is a great platform to join as a Participant Joining our platform as a Prolific participant will give you the chance to influence the AI models of the future using professional legal 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 to more information on Prolific 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 use of your personal personal information.