Two interviews were conducted.

The first was a basic overview of my resume and a review of a data structure.

The second interview was stated to be purely technical, but it turned out to be behavioral.

We discussed a specific full-stack application that I built.

I was asked a question on how to implement a hashmap and the theory behind it. There was no code involved, as it was a phone interview.

In the remaining five minutes, I was asked about the pros and cons of Mean Squared Error, since I mentioned I was looking to work on a data science team.