From my own personal experience through a Google acquisition: you don't need to go through the interview process. We got calibrated to Google's system, and afte

From my own personal experience through a Google acquisition: you don't need to go through the interview process. We got calibrated to Google's system, and after that we were as able to move around as any other "real" Google engineer (read: people who went through the interview process.) Mind you, YMMV depending on division you get acquired into and your position.