[d3ckard]

I learnt Elixir myself, on the job. It's certainly doable. Actually, if I ever had to hire developers, I wouldn't care at all about their previous language experiences. The only thing you achieve asking for n years experience in y is discouraging talented people who worked on something else.

The thing is, you choose right tech for the job and then reserve some time to bring everybody up to speed. From my own experience it is much cheaper than trying to use already know tech in ways it was not designed to work.