Is whiteboard interviews a sv thing? Because they seem to be rare in the Midwest? Maybe I've just been lucky. But they seem like an incredibly poor way to interview someone.
I have a simplified skeleton of class that is similar to the problems we solve every day and failing unit tests.
They have to make the unit tests pass.
Then I give them a second set of requirements and they have to make the second set of tests pass without breaking the first set.
This is a topic that has been discussed to death for years and there are ample resources on the Internet for anyone who is genuinely interested in alternative approaches to whiteboard interviewing.
I'll be crude but whiteboard interviews are fucking stupid, obnoxious and wastes time, you will definitely miss out on quality candidates. You might as throw a personality test in for the ultimate combo of "how to fail at hiring"