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Kotlin is very good. Just my 2 cents.
There's many options
You can use Java and use the swing library,but the swing components aren't too nice looking
C++ has library called sfml to create GUIs.
Python has a library called tkinter(I vote this one the ugliest looking of them all.
Too bad youre shitting on .net (especially C# is great imho), as its the easiest thing to use for GUI, anything else is pretty much things only a mother could love
You could give electron a try, which is basically a packaged browser, running cross platform your webdev
edit: oh, a backend guy, then youll probably wont have much from electron?