[anyfoo]

> Maybe we're just really bad at interviews? It probably doesn't help that management here is almost entirely non-technical. There's usually a developer or two sitting in on the interview to try and balance it out, but I don't think any of us would consider ourselves particularly good at interviewing people.

This seems to be the issue, in fact it's quite baffling to me. If you are interviewing for a technical role, why would you not perform a technical interview led by technical staff?

I'm not saying the other stuff is not important as well, but this reads to me like you are essentially leaving the core of the role out of the interview (I'm not sure what "usually a developer or two are sitting in as well" means).