Thanks for the interview both Stephen and Erica, I really enjoyed reading it as I knew little of Elixir. I guess I was drawn in by the Ruby part in the title 
Reading the interview I see it has good scaling abilities up, but I like to tinker with IoT and smaller devices like single board computers and devices that run on battery (or are in different ways quite constrained) how would you say Elixir is useful on such devices?
Congratulations with the book!
Thomas