[Ruud-v-A]

To be clear, our new application is better (faster, scales better, more maintainable), for the most part because of the improved architecture.

As we were going to do the rewrite anyway, we considered more alternatives than just Python. For programs that have to be reliable and maintainable, I prefer a language with a strong static type system. Haskell has that, and it has a few practical benefits over other tools that made it an excellent choice for our use case.