This is 100% Arrowhead. I could be mis-remembering, but I'm reasonably sure there wasna't a coding test and definitely no "do this on a whiteboard" questions during my interview. They asked gently probing questions to ensure I wasn't a BS-artist, but cared more about social fit.
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When everyone is comfortable around each other yet passionate, drama and discourtesy simply don't arise. It's incredibly refreshing to be working for a company that both talks the talk and walks the walk when claiming to value people who have passion for their work.
As an aside, fostering a work environment where people are comfortable with each other is paramount: Without fear of petty reprisals, people will ask for the help they need. They'll give the feedback that others need. Problems that would otherwise fester are solved quickly.