Ah nice! Did you know that Dave is coming out with another course ‘soon’? I can’t wait for it 
In the meantime I have just started reading Learn Functional Programming with Elixir (Pragprog) and am loving it so far - from what I’ve read so far (and I’m not sure how much experience with functional programming your team has, but) it seems to be particularly good at introducing functional concepts 
Don’t forget you can use the forum discount to get 35% off PragProg and Manning books 
