[wandering2]

>Python and Ruby get you where you need to be fast, and if you get far enough and need to scale, there are a huge number of options, from stalwart holdouts like Java and C# (now on Linux!) to newer languages on rock-solid run times like Clojure and Elixir, to whole new languages like Go and Rust.

To be clear, are you suggesting that's reasonable to do a rewrite (or at least for certain parts) from Python/Ruby when you need to scale? Is that going to be reasonably accomplishable in many cases? Honest question. Just wondering what you have in mind.

[toast0]

Rewriting systems in another language can certainly be accomplished. If possible, doing it in bits and pieces will help it actually happen; if you do it as a single big switch, you have to work a lot harder to avoid the second-system effect.

In this case, you probably first start by switching your message queuing to Erlang (RabbitMQ), since you had a problem with that anyway; then you can expand outwards from there if it makes sense or makes you happy: job running in Erlang, webservices in Erlang, putting the data in mnesia instead of postgres, etc. You can do the same with any language, of course.