Google

It went well. I was nervous, but I gained confidence in the end. It was a nice experience and seemed like a once-in-a-lifetime opportunity. It gave me motivation for the future.

A hard and competitive interview. Interview questions ranged from medium to hard, and the difficult questions made it very tough. Even Oxford-level graduates find it difficult to enter, which explains the difficulty.

It took a long time for them to respond to my application, and I submitted several before I finally heard back. The interview process itself wasn't bad, though it still took several weeks to go through.