I think it’s fair to say that a good amount of folks - if not the majority of them - using Elixir in production today are doing so after migrating an application to Elixir from some other language instead of just building in Elixir from scratch. Of course this idea of re-writing an application is scary, and rightly so! But there are some ways to make this process simpler and less scary, and also to reduce the likelihood of introducing regressions during this process, and that’s what I go over in this post.

http://devonestes.com/migrating-to-elixir-with-the-strangler-pattern