Compared to other interviews, the coding questions were much more difficult. However, the time was too short to solve them completely. I don't know if they were the most difficult ones.
The following metrics were computed from 3 interview experiences for the Citadel SWE role in United States.
Citadel's interview process for their SWE roles in the United States is extremely selective, failing the vast majority of engineers.
Candidates reported having very good feelings for Citadel's SWE interview process in United States.