Interview process was pretty informal, as I was recommended from another university. I was basically asked enough questions for them to figure out I knew what I was talking about. Afterwards, we talked about what kind of projects they'd like to see, and what I think would work best for their goals. The hiring process was also fairly straightforward. Costco has a handful of different buildings, so I got confused and ended up at the wrong one when I needed to go in for hiring paperwork - they were very helpful and kind when instructing me where to go. They do have a pretty strict drug test, although I'm not sure if they had a problem with smoking weed at home, as long as it didn't come into work, I think they did. Finally, about Costco itself: Everyone is very friendly and cordial to each other. I was greeted in the hallways quite frequently, by people I had little or no recollection of. There's always pleasant small talk to be had while waiting for a shuttle or in the break room. There seemed to be a lot of unwritten rules? My manager kept me on a pretty short leash as far as talking to other people went, but that could just be my personal experience. The dress code is too stuffy for me, though. It's definitely "business", not "business casual".