Applied through a job board and then set up for a technical phone interview and then an onsite interview. The interviewers were unprofessional. They were laughing while I was answering the questions in the room. Really bad experience, and I would never recommend anyone for this one.

The interviewers didn't know that the factorial of zero is 1 (!0 = 1). Guys, please check your knowledge before interviewing anyone.

A question on some factorial.