You work on an Excel problem, and you answer questions about your work experience. It wasn't very hard, but the interviewers were not professional. There were a series of 3 interviews in the process.
Screening: A preliminary interview to determine if you're a viable candidate.
First interview: The first face-to-face meeting with the potential employer.
Second interview: A follow-up meeting if you've impressed them in the first interview.
Third interview: Additional rounds of interviews may occur.