I would not recommend interviewing in the Walnut Creek office. I spoke to three different engineers, but not at the same time, only the first one, then the second one, then the third one. I was there almost two hours, and it was not very respectful of my time, instead of speaking to all three at once. I fully admit I was nervous and stumbling a lot speaking to the first engineer, and I think she was trying to get me back on track by saying small assurances like "yeah" "yeah okay" "okay" "yeah definitely" etc., but it was extremely distracting when she interrupted my every word and it threw me off even more. I also felt like she was pitying me which made me feel even worse. The second and third people were pretty cool though. But overall it was the worst interview I've ever done.