I've found this works to great effect. I ask the prospective interviewee ahead of time for an example of some code they wrote that they're proud of. And then i

I've found this works to great effect. I ask the prospective interviewee ahead of time for an example of some code they wrote that they're proud of. And then in the interview, I ask them to teach me how it works, what could be improved, etc. I might not know anything about it, but I can tell when someone's pretending to teach a thing. Once had someone bring in a device driver in C for a JavaScript position. Now, I've never written a device driver, but I know the general concepts, and the applicant's description was cogent. They got the job, and they were a great hire.