I work in sort of devops teams and I've helped conduct the technical part of a few interviews so I made some questions for that reason.
1. Some technical questions but they're not that important.
2. More important is what they do in their off time. I always try to figure out how nerdy they are.
One person when asked the 2nd type of question brought out their mobile phone and showed us how they could control their entire home with an open source automation system and a homemade app they made themselves.
They were hired and they were very good.