I learnt about this situation, as it happens, from the founder of Griffin, so was particularly interested in this blog post. It seems like the initial excitement of developing a banking system in Clojure might have transitioned to more bread-and-butter aspects of banking now, but immutable data is an ideal match for their mandatory audit trails.

I have to admit that I wouldn't mind being paid a large sum to switch to Griffin, but then again, my current provider is one of the more responsible ones which didn't have to be bailed out in the crisis :)