Clojure + Ring + Compojure on the server, ClojureScript + Reagent on the client. Because I don't know any better, and want to be punished the moment I have to hire anybody.
Another server-side option is Macchiato (https://macchiato-framework.github.io), ie. Clojurescript on Node.js. The whole Clojure/script stack really deserves wider adoption given that it arguably enhances React while reducing the insane amount of JS tooling.
but with all that functional immutable efficiency, do you really even need a second person? #yagni