Fab.com Software Engineer interview questions

I was contacted by their HR and the process took about a week. Had a brief chat with the HR at their office before starting off with the interviews. There were two technical rounds followed by a meeting with their CTO. The technical rounds are your standard algorithm based ones. Nothing too difficult. The CTO round is culture-fit test, where he tries to figure out if you are a culturally good fit for the company (I wasn't).

This interview process was pretty weird. First the HR comes and asks questions whether we are OK with working weekends, night-outs! Strange to encounter this question before the process actually begins. Next two young folks come and ask about product architecture and start behaving as if they don't understand anything. One of them was just not paying attention at all and was constantly looking out of the room. On mentioning monitoring tools like NewRelic, they gave a dumb-founded expression. Felt like they were more interested in making fun rather than seriously asking questions. That gave a very poor impression on my mind.