Just completed my Google interview process, it was biggest waste of my time in recent years. Oh the technical questions can vary from Linux kernel question on how something interfaces with kernel/ring0 to front end library which fetches web images, then coding a esoteric algo.

I am disappointed in myself that I wasted small period of my life falling for recruiter/social hype of these companies. Worst mistake you can make while looking for a job is to prepare for one specific company, web is full of this garbage content to answer specific company questions.