I have offer from Amazon, which I received on 19th June.
My current company's last working day is 17th July, so Amazon has given joining date as 18th July.
Paralelly my interview with Google is going on.
The idea was to complete both Amazon and Google, and choose the best, but after Google's onsite rounds, recruiter told that 2 of them are positive and 2 negative, so I'll have to go through another onsite round. I asked to schedule that round asap, but they scheduled the extra round 1 week after the previous onsite round. The extra round was actually scheduled for 6th July. I sat in the interview, but interviewer didn't show up. After mailing multiple times to the scheduler, she told that interviewer was busy, so she'll reschedule it. Recruiter and me, both told the scheduler to schedule asap, but she haven't scheduled the interview yet.
Most probably my interview will be next week.

So what to do? Should I delay the joining date of Amazon?
Or I should go ahead and join Amazon, and paralelly let Google complete the process in a month or so, and if I crack Google with a better offer, switch to Google?