Google

This is a classical "Cracking the Coding Interview" type of interview. It needs a bit of improvement. It is not hard if you work on all those questions on the internet. However, if you don't, it is kind of harder to pass.

Requires deep knowledge of computer science.

I was not selected, but it was a good interview and I learned a lot. The interviewers were nice and critical regarding selection. The other candidates were very competent, and hopefully, I can make it next time.