• Develop and maintain responsive, high-performance frontend dashboards using React.js for operational workflows. • Build and support backend services with Node.js and Express.js, ensuring robust CMS functionality. • Design and implement core modules: order & fulfillment management, shipment tracking, inventory visibility, warehouse workflows, and automation triggers. • Integrate ShipHero APIs, Shopify, and internal systems for seamless data flow and real-time updates. • Implement secure authentication, session management, and role-based access control (RBAC) for operational users. • Write clean, modular code with unit and integration tests; maintain CI/CD pipelines and support deployments via Git, Docker, and cloud platforms. • Collaborate closely with Operations, Logistics, Product, and Support teams to refine features and optimize workflows.

Role Description 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. Qualifications - 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. Requirements - 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. Benefits - Competitive pay rates. - Flexible hours. - Ability to work from home.

Role Description 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. Qualifications - 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. Requirements - 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. Benefits - Competitive pay rates. - Flexible hours. - Ability to work from home.

• Design, develop, enhance, debug, implement, and maintain software • Troubleshoot system problems and issues related to software and develop fixes • Code software to adhere to designs supporting business requirements and customers • Consult with project teams and end users to identify software requirements and enhancements • Resolve problems with software developed and respond to suggestions for enhancements and improvements • Perform other duties as assigned