I had phone interviews with virtually every member of the team I would join, mostly ranging from 30 minutes to an hour each.

The first interviews were mostly non-technical.

However, I had a series of three back-to-back-to-back phone interviews, each an hour in length, that were very in-depth.

• One was purely about mathematics theory and statistics.
• One was about Java programming technique.
• The third was a more algorithmic problem that the interviewer and I went through in pseudocode.

The algorithm question was very difficult. It required figuring out a grid search algorithm and analyzing its time complexity.

Then, various alternative implementations were needed that would minimize data storage or the order of the algorithm.