Have you worked on projects where Kotlin was used?

Yes, I have worked with Kotlin in several projects. Kotlin is often used for Android app development and server-side development due to its conciseness and full compatibility with Java. For example, in one project, I wrote a REST API in Kotlin using Spring Boot, which helped reduce boilerplate code and improve readability through features like data classes, extension functions, and coroutines for asynchronous programming.