The online interview was completed on HackerRank. The questions were fairly straightforward and similar to what you might encounter in a first-year university course. It's a good idea to brush up on your general algorithms.

The phone interview covered your general background, including work history and university subjects. Then, you were asked to solve a question. It was pretty straightforward. Make sure to talk through your thought process. If you can't immediately think of an optimal solution, present the naive approach first and then optimize it.

Basic algorithms: Finding how many of each character appear in a string in linear time.