HTML/CSS - Senior Developers - AI Training - US

🏢 Summary: Opportunity for senior HTML/CSS developers to contribute to AI model training by evaluating and improving AI-generated frontend code and design implementations. The role involves reviewing semantic structure, responsive layouts, accessibility, and cross-browser behavior while providing technical feedback on frontend logic and design systems. Flexible remote work with paid tasks and compensation up to $40/hr based on experience. 🗂️ Requirements: BSc in Computer Science, Software Engineering, Web Development, or related field, Senior-level frontend development or UI engineering experience, Advanced HTML and CSS expertise, Ability to build responsive layouts without frameworks, Knowledge of CSS cascade, specificity, Flexbox, CSS Grid, and WCAG, Experience with semantic markup and maintainable CSS, Familiarity with cross-browser compatibility and testing tools 📃 Skills: HTML5, CSS3, Flexbox, Grid, WCAG, Tailwind, SASS, SCSS, CSSModules, DevTools, axe, Lighthouse, BEM 🏢 Description: About Prolific Prolific is building a global platform for high-quality human data used in AI development. The role We're looking for Senior HTML/CSS Developers to help train and evaluate AI models. Candidates with a background in Software Engineering or Frontend Development will complete a short skills assessment before joining the platform as paid participants. Researchers may pay up to $40/hr depending on skills and experience. Tasks may require one hour of uninterrupted work, though many are shorter. What you'll bring - BSc or higher in Computer Science, Software Engineering, Web Development, or a related technical field - Real-world experience as a Senior Frontend Developer or UI Engineer specialising in HTML/CSS - Ability to independently build complex, responsive layouts and components without relying on frameworks or libraries - Expert understanding of CSS cascade, specificity, box model, Flexbox, CSS Grid, accessibility standards (WCAG), and cross-browser compatibility - High standards for semantic markup and maintainable CSS, including BEM methodology, design tokens, and modern CSS standards What you'll be doing in the role - Review AI-generated HTML/CSS for correctness, semantic structure, and best practices - Audit AI explanations for layout and styling approaches - Render and test generated markup and stylesheets for visual output and browser compatibility - Identify inaccessible markup, inefficient selectors, deprecated attributes, and incorrect CSS properties - Provide structured feedback on responsive design, component architecture, and design system implementation Key Technologies - HTML5 and CSS3/4 including custom properties, animations, and modern layout systems - Tailwind CSS, SASS/SCSS, and CSS Modules - Browser DevTools, accessibility auditing tools such as axe and Lighthouse, and cross-browser testing platforms Benefits - Competitive pay rates - Flexible working hours - Remote work opportunities - Opportunity to contribute to the development of advanced AI systems Privacy Notice By submitting an application, candidates agree that personal data may be collected for recruiting and organizational planning purposes.

🏢 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 opportunity for Senior HTML/CSS Developers to evaluate and improve AI-generated frontend code by reviewing, testing, and annotating model outputs. The role involves assessing code quality, accessibility, and cross-browser behavior while providing structured technical feedback. Participants complete paid, task-based work to help train advanced AI systems. 🗂️ 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, CSS Grid, Strong understanding of WCAG accessibility standards and cross-browser compatibility, Experience writing clean, semantic HTML and maintainable CSS, Familiarity with BEM methodology, design tokens, 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, 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 expert network and contribute to training and evaluating AI models by reviewing, testing, and improving AI-generated frontend code. The role involves assessing code quality, validating technical reasoning, and ensuring best practices in responsive and accessible design. This is a paid, task-based engagement requiring strong independent frontend expertise. 🗂️ 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, 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, Availability to complete uninterrupted one-hour technical tasks 📃 Skills: HTML5, CSS3, CSS4, Flexbox, CSSGrid, 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 evaluate, test, and refine AI-generated frontend code. The role involves assessing code quality, validating technical reasoning, and ensuring accessibility and cross-browser compatibility. Participants complete structured AI training tasks and are compensated per project/hour. 🗂️ 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, CSS Grid, Strong understanding of WCAG accessibility standards, Experience ensuring cross-browser compatibility, Ability to produce clean semantic HTML and maintainable CSS, Experience with BEM methodology 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, 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 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 support AI training by evaluating, testing, and improving AI-generated frontend code. The role involves reviewing markup and styles for accuracy, accessibility, responsiveness, and cross-browser compatibility, as well as providing structured technical feedback. Work is task-based, remote, and focused on high-quality frontend code and design 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, Advanced proficiency in HTML and CSS without reliance on frameworks, Expert knowledge of CSS cascade, specificity, box model, Flexbox, Grid, Strong understanding of accessibility standards (WCAG), Experience with cross-browser compatibility and testing, Ability to build complex, responsive layouts independently, Experience with clean, semantic markup and maintainable CSS (BEM, design tokens) 📃 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.