Dominik Kundel describes building a TodoMVC application using Twilio Sync and JavaScript. He outlines the setup process, which includes installing Node.js, creating a Twilio account, and cloning the template repository. The application uses Twilio Sync to store data and share it across multiple devices in real-time. The author explains how to implement various functions such as storing, finding, inserting, updating, removing, and dropping items, as well as handling authentication and permissions. Finally, he demonstrates how to use Twilio Sync's event-driven capabilities to update the list in real-time, showcasing its potential for building complex applications with real-time data synchronization.