Side note - I do NOT use whiteboard technique in my interviews. I ask the candidates questions about the stuff they mention in their resumes and go deep in the technical discussion based on their responses (or I told them to walk me through one of their recent projects be it a work project or their side project). Using that 'simple' technique, you can easily filter out so many pretenders (as I'd like to call them, who have splendid resumes but little to back things up when grilled the details about their resumes).