We’re thinking about writing a desktop app in Kotlin. We’ll initially target the JVM, but it would be nice if we could do things in a way that will make it easier to compile to native also. Are there any high-level suggestions for doing this? I guess try to avoid any Java dependencies that don’t have similar native equivalents…

You should really look at #tornadofx

Abstract your dependencies away. Write as much code as you can in a platform independent module. Then provide your platform dependent dependencies by interface. Google clean architecture.