There were three phone screens and then an on-site interview. Questions weren't that hard. The group design review is extremely difficult. If you can get friends to review your design of something. Have them interrupt you, graph stuff, question you, etc.

The interview went well overall. The interviewer opened with a discussion about a project I'm proud of, then a beam scenario question that covered structural and load analysis, stress and deflection, and material selection — testing my ability to connect first-principles thinking across the full problem space.