I applied through a recruiter after meeting a MongoDB employee at a hackathon.

I went through an informal get-to-know-you interview over the phone, followed by a technical interview over the phone.

Both phone interviewers were extremely kind, and I thought the person conducting the technical interview was both patient and helpful.

First, I was asked a few basic design questions, such as how I would design an online chat system with separate rooms.

Then, I was asked why I had chosen some of the technologies I had worked with.

I was asked a standard question about manipulating an array. The input array contained sorted integers, and I was asked how to square all the elements and keep the array sorted.