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Nothing hard. Know your band diagrams, short channel effects and basic MOS operation.
Sigiloso
The key in these questions is to cover the fundamentals, and be ready for the back-and-forth with the interviewer. Might be worth doing a mock interview with one of the Sandisk or ex-Sandisk Senior Device Engineer experts on Prepfully? They give real-world practice and guidance, which is pretty helpful. prepfully.com/practice-interviews