I applied online. The process took two weeks.

They checked deep understanding of every concept. Whatever you prepare, you should prepare in-depth. They will ask questions from your answers, so be careful while giving answers. Mostly, the interviews were based on multi-threading.

I was asked about HTTPS, how encryption works, and how authenticity is maintained. I was also asked about the time complexity of the previous round's code and whether we can replace RAM with ROM.

Other questions included the difference between a process and a thread, multithreading versus parallelism, and how multithreading works in a single-core CPU. Finally, I was asked how domains work and who owns DNS servers.