The interview process involved:

• Three phone calls
• Three on-site interviews

Questions varied and included:

• Algorithm questions
• Design questions
• Questions involving functional programming (I would emphasize that understanding OCaml itself is not as important as grasping functional programming concepts like monads, types, and tail recursion. These were not basic concepts but rather more advanced ones).

Everyone was professional. It was easy to understand their questions, and you were encouraged to ask for clarifications.

Two of the interviews had algorithm questions, another two had design questions, one functional programming interview, and one coding interview.