They can ask probing technical questions about past work experience, projects and education. Pretty much like how every other industry interviews people.

You are right that interviewers won’t get much more than an hour to judge a candidate. So why waste it on information that fundamentally can’t be helpful (like whiteboard trivia)?

Instead, first jump right into a domain where the candidate should already be comfortable and technical — their past work projects — and go from there, probing for more technical depth.

The idea that it somehow makes more sense to use limited time by wholesale discounting & ignoring the person’s previous work history in favor of having them write a sorting algorithm in CoderPad is totally indefensible.