A Web Platform Developer builds, maintains, and enhances websites and web applications, translating designs into functional code (HTML, CSS, JavaScript), ensuring performance, responsiveness, and usability across devices, while integrating APIs, managing databases, fixing bugs, and collaborating with designers to meet business goals. They focus on both front-end (user interface) and back-end (server, database) aspects, ensuring a seamless user experience and technical stability, often working full-stack or specializing in areas like React or WordPress.