They conducted a hiring event in a hotel and called. Some written test was there, having a few aptitude questions and C++/SQL questions.

The shortlisted candidates had three rounds of interviews that day.

All were very basic, like Fibonacci, reverse a list, etc. And you know what, we three people were remaining in the end, and they conducted dozens of phone interviews later. That really irritates, as you have to take time out of your office to attend. They are very bad at caring about people's time; many times they just schedule and forget.

Finally, in one phone interview, I got irritated and told them I was no longer interested in this opportunity.

Many interviewers on the phone just show off. They seem to think they work for the best company in the world.