This feels like a scam. They're in an unmarked office building and multiple companies were interviewing out of the same office, the receptionist seemed flustered and wasn't sure which company I was even there for. They were calling people back in groups but the scheduling process didn't mention anything about it being a group interview. My interview was at 1:30, I showed up early and 20 minutes later I still hadn't been seen. I told the receptionist I had to leave because I needed to return to my office. It's very obvious that they offer an interview to everyone that applies and are completely disorganized. Smells fishy, felt scammy, I wouldn't waste your time. Also, the e-mails come from one address but are signed by multiple different names. Bizarre.