I would just demonstrate that you can pick up a new stack easily by putting up some code on Github that uses the stack. It's not a perfect solution, but we hav

I would just demonstrate that you can pick up a new stack easily by putting up some code on Github that uses the stack. It's not a perfect solution, but we have hired people before with no work experience in the stack we were using, but with Github code to prove they were comfortable with the tools.