reverse proxy, with either rails or phoenix in front… (in your case it sounds like you would keep rails in front, given a slower tempo)
phoenix in front:
https://blog.fourk.io/replace-your-production-api-with-elixir-today-4426a8903642
rails in front:
depending on your setup/use case you can also run with two URIs on the client - (eg if you do header auth or something)
