Google Site Reliability Engineer interview questions

A recruiter found my info from an application several years earlier. We scheduled an informal phone call to discuss potential full-time position and decided to move forward. Next, we scheduled a technical phone interview with an engineer. This was done with a phone call and shared Google Doc (for coding). After passing the phone interview, I was contacted by more recruiters. We scheduled another informal phone call and on-site interviews. The on-site had four 45-minute interviews with an informal lunch in the middle.

I got an email from a recruiter of Google and talked to him on phone for 10-15 minutes. He had found me via LinkedIn and was basically looking for a developer. However I told him I am interested in doing a PhD program and asked if they offer anything. He said no but they have PhD internship programs, etc.