There were various JS, React, C#, and Azure/.NET questions that were asked in the general technical interviews that I had, which were pretty fundamental, so I wouldn't worry about this too much.
The whiteboard technical interview was initially described to me by the HR representative as involving discussion of a website design from front-end to back-end/database, I feel the senior devs ended up drilling database/model design heavily, which kind of felt a bit disconnected from the high-level nature of a whiteboard assignment. That being said, it was clear that their main objective was to understand my critical thinking, solution-building, and workflow process. I suppose it was a fun experience.
