The interview process was rigorous involving multiple technical rounds, even if prior notification wasn't given regarding the fact that it was a technical interview, causing some of us to assume the technical round had finished and it was an HR interview.

I gave one round of interviews where the interviewer showed 3-4 C program code snippets and asked me to tell the output first and then run it on an online compiler such as Online GDB. Then, he asked me about communication protocols and a few basic questions about microprocessors and microcontrollers.