Google

It is a very interesting process. There were two technical interviews, where they asked technical questions that should be answered by coding a solution in your preferred language (usually C, C++, Java, or Python).

I was summoned, but the interview itself never happened. I didn't receive any further information after that, I waited, and I refused another offer in the hope of being called again.

Phone interview and on-site with 4 Googlers. Some of them went really well, and others not so much. Ended up not getting an offer, but the overall experience was nice. The recruiter took too long to reply about interview results.