That’s precisely where I would like to use Crystal. I would use Elixir as the core of the app - because the app needs to do lots and lots of things at the same time - and languages like Crystal for specific things where they excel (such as image manipulation)… but only when actually needed.
I like the analogy where Elixir is the brains (of an app) and other languages can be organs. The brain ties everything together, communicating instructions, receiving messages, interpreting them and then passing on other commands, etc.
The great thing is you can do most things with Elixir/Erlang (with common libraries such as ImageMagick) and only drop into other languages for very specific things when you actually need to; the core of your app, or the overall system, is unlikely to change. It’s one of the reasons I love the Replaceable Component Architecture (and love Elixir for making it so easy).
