Started with a brief phone call from the recruiter, asking basic questions about my qualifications. After that, I was sent a coding challenge via email. I was asked to not disclose what the challenge is, but it's simple and straight forward, and the email will tell you what the expected answer is so you can check your work. Then had a phone interview with two engineers. They asked a series of canned questions about my experience.
I had an on-site interview about a week later. In general, it was pretty average, though very light on the technical side of things. One of the engineers kept asking me the most bizarre questions I've ever been asked in an interview like "what is your favorite part of the python programming language?" and when I answered he wasn't satisfied with what I said and was trying to get me to change my answer. It's an opinion based question.... my answer, by definition, cannot be wrong. I think he wanted me to list off notable features of the language as if that was some sort of demonstration of technical ability (list comprehensions, decorators, lambdas, etc.). So weird. The answer I gave was that I appreciate the elegance. The only technical segment was a brief architecture question from the VP of Engineering, which I tripped up on a little bit, but he was super cool about it and helped guide me through to the answer.
In general, everyone was incredibly nice and enjoyable to talk to, and I got the impression that I could enjoy being in their presence all day. However, the CEO used some aggressive interview tactics on me, which I did not appreciate, and which left a sour taste in my mouth. I think he was trying to put on a lot of pressure to see if I choked or changed my answers.
I got the impression that I would need to forgo having a work/life balance to be successful at PollyEx, and would need to work 50 hour weeks. Maybe that's standard for Bay Area engineering, but it's not quite what I was looking for. I pulled out of the process before they could make a decision as I had a more compelling offer come through.