"Senior software engineers are the most experienced member of a software team and usually carry the most responsibility and authority of that team. Because of this, interviews will be designed to find candidates who have expert knowledge of the field and years of experience as a software engineer. Expect to be asked tough technical questions and to give examples of previous projects that you have worked on."
Fun question involving number theory and basic modular arithmetic on top of a few more typical data structure questions. It was nice that they did not require perfect syntax in this phase and instead focused on the design, thought process, data structures, algorithms, and asymptotic complexity.
Decently. I guess I answered most questions reasonably well.