I was contacted by a recruiter.

I had one technical phone interview, and then I was invited onsite for four interviews.

Three of these interviews were algorithm and code-based, and one was a system design question.

The system design question was the most frustrating because the interviewer did not articulate which part was supposed to be designed until the very end.

I suggest asking a lot of questions and pressing the interviewer to state exactly what they want you to design.