One of them gave an elixir conf talk about how they built an elixir team[1] and this one from 2022 which isn't online yet[2]. I know a little more about it from talking to them, but couldn't accurately describe the transition from memory.

[1] https://www.youtube.com/watch?v=zKifFG4i-bY

[2] https://2022.elixirconf.com/speakers/zack-kayser

This is probably the most comprehensive thing online[0]. Not an article but you can read the transcript of the podcast episode[1].

0: https://smartlogic.io/podcast/elixir-wizards/s7e2-jose/

1: https://smartlogic.io/podcast/elixir-wizards/transcripts/s7e...