Explore the versatility of Kotlin as a complete ecosystem in this 41-minute conference talk by Ibrahim Gharbi and Yassine Benabbas at Devoxx. Discover how Kotlin extends far beyond being just a JVM language, powering everything from backend development to cross-platform front-end applications and data science projects. Through three comprehensive demos covering different development stacks, including experimental ones, learn how to become a fullstack developer while maintaining clean architecture principles. See practical implementations using libraries like Ktor client/server and DataFrame. By the end of this presentation, understand how Kotlin makes it remarkably straightforward to develop mobile, desktop, web, backend, and data-science applications, as well as infrastructure-as-code solutions—all with the same language.