The interview was good and thorough. They asked in-depth questions on data structures like trees and graphs, operating system concepts such as process management and memory allocation, SQL query writing and optimization, along with various competitive programming problems to evaluate algorithmic thinking, coding efficiency, and problem-solving abilities under time constraints.

They asked me to explain how a hash table works and to implement one from scratch, focusing on handling collisions efficiently and discussing time complexity for insertion, deletion, and search operations.