Java, Scala, and Kotlin aren't the only options for "one language on the client and the server." You could also use C++, C#, JavaScript, Lua, Objective-C, Pyth

Java, Scala, and Kotlin aren't the only options for "one language on the client and the server." You could also use C++, C#, JavaScript, Lua, Objective-C, Python, Ruby, and more. See http://www.mobilechameleon.com/ http://www.mobilechameleon.com/ Some people just fall into using one language and want to use that language for everything. Why not let them?