I've been interviewing actively for the past few months and, yes, whiteboard interviews are very common (unfortunately).
Typically, it's some kind of coding puzzle that frequently doesn't have much to do with your ability to do the job. So, practice up on your basic data structures and algorithms even if they aren't all that applicable to the job in question.
As for interviews I've conducted in the past when I've been the one doing the hiring, I prefer a conversation to testing. I ask about their projects, what they found most enjoyable and what was their least favorite, most and least challenging, etc. I ask about their approaches to problems.
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I've been interviewing actively for the past few months and, yes, whiteboard interviews are very common (unfortunately).
Typically, it's some kind of coding puzzle that frequently doesn't have much to do with your ability to do the job. So, practice up on your basic data structures and algorithms even if they aren't all that applicable to the job in question.
As for interviews I've conducted in the past when I've been the one doing the hiring, I prefer a conversation to testing. I ask about their projects, what they found most enjoyable and what was their least favorite, most and least challenging, etc. I ask about their approaches to problems.