There were two 45-minute interviews. The first focused on problem-solving: I introduced myself, was given a problem, and we discussed multiple approaches. I implemented one solution, completed a follow-up task, and then compared my implementation to a better alternative while discussing time and memory trade-offs. The second began with a brief introduction and a walkthrough of two of my projects and their flows. The interviewer then asked about hash maps (how they’re implemented), basic OS concepts, and databases.