I can only speak from anecdotal memory, but I'm pretty sure Wit.AI primarily used clojure (arguably one of the most expressive lisps of all time) to go from 0 t

I can only speak from anecdotal memory, but I'm pretty sure Wit.AI primarily used clojure (arguably one of the most expressive lisps of all time) to go from 0 to acquisition in 18(!) months for what was essentially a pure software product.