Difficult and thought-provoking, interviewer asked about advanced C++ and DSA. Overall quick process, and results were generated in a day. Be prepared with DSA, advanced OOPs, DBMS, cybersecurity, and Linux. Focus on concepts like memory management, graph traversal, database normalization, secure coding, kernel-level debugging, multithreading synchronization, compiler design, network layers, API security, virtual memory, pointer arithmetic, and encryption algorithms.