Specify which programming language you used: Java or Kotlin?

I used Java for developing server-side logic, writing business logic, and working with frameworks such as Spring. I also used Kotlin for creating Android applications and some microservices, where I appreciated the conciseness and modern features of the language, such as coroutines for asynchronous programming.

Example in Kotlin:

fun greet(name: String) = "Hello, $name!"
println(greet("World"))

Example in Java:

public String greet(String name) {
    return "Hello, " + name + "!";
}
System.out.println(greet("World"));