I had a BA student write his thesis on this matter. What if I want to write a system that has a web app, api, iOS and Android app? How can we mitigate the gazil

I had a BA student write his thesis on this matter. What if I want to write a system that has a web app, api, iOS and Android app? How can we mitigate the gazillion different languages and paradigms? Turns out, it's easy with Clojure. Have even written desktop apps with it since.