Lots of words, but the ssl on the website is broken. After all, it is a bank. The important point: it’s a good thing to choose a strong stack of a few tools and avoid adding more languages and tools as much and as long as possible. It’s true in every scale, 600 or a single developer. By the end of the day, Clojure is their Cobol and it will stay with them for as long as they exist. Everything else is just how they reason around it. The specific technology choices they made are a mistake, IMHO. But it doesn’t really matter.