Skip whiteboard tests. Instead, ask candidates to walk you through an app or code they built themselves. You learn how they think, what they care about, and whether they can actually explain their work.
I really try to figure out a way during the interview process to see how they react and like what those skills are going to be like. I try to stay away from coding exercises in terms of whiteboarding sessions or online coding exercises. I don't think those work well for— I mean, they do for some people, but not for everyone. It's better to give people a choice. Often what I like to do is say, bring us an application that— or some code that you've written, walk us through it, tell us about it. You can learn a lot about what people are passionate about and how well they know the tech if they walk through their own code.