How did the migration go if I may ask? Was it progressive or clean slate? i.e. develop in parallel the new Elixir implementation and just switch when everything is green and all the specs match the Ruby app.
We're starting new projects in Elixir. We haven't ported anything from Ruby to Elixir yet, but we have a 9 year old ~100k lines of code (not counting views/tests) Rails app that we could make an argument to extract some functionality from.