[vikingcaffiene]

> generic backend principles are very easy to spew correct answers for without actually knowing how to code

I'm not sure I agree with this. IMO trying to get someone to explain the ins and outs of a particular facet of the technology your team works in is less effective than getting a sense of how a candidate architects their code and manages complexity. That type of "art more than a science" craftsmanship is not something you can easily fake in my experience. Maybe I'll be proven wrong. We shall see. So far I've had pretty good luck with the approach and gotten some really great teammates.