Linux, Hardware, Networking, Fiber Optics, Googleyness Leadership. 4 different rounds inclyding recruiter screen. Prepare each category well. Common questions include common linux commands, how to troubleshoot computers, different components and what fiber optics are.

Easy process. 3 interviews, 1 hardware, 1 networking, and one about Googlyness. It wasn't bad overall. The only thing that's bad about Google hiring process is after you pass those interviews you have to go through team matching/ fit calls until a team accepts you. And that could take months. It's been 3 months since I passed the interviews and I've had 3 fit calls so far and still haven't found a team that will take me although I'm open to relocating and everything.