A developer builds a chat application using Twilio Programmable Chat and KendoReact conversational UI components. The application allows users to log in, choose a username, and engage in real-time conversations with other users or bots. The developer uses Node.js, Express, and React to create the server-side logic, while leveraging KendoReact's pre-built components for a seamless user experience. As the chat application takes shape, the developer tackles challenges such as handling errors, sending messages, and rendering the conversational UI in a way that is both functional and visually appealing. The final product demonstrates how Twilio Programmable Chat can be effectively integrated with React to create a robust and engaging chat application.