You interview to get into Google at a specific level (new grad, SWE III, etc). They don't reveal which project you will be working on until the offer stage thou

You interview to get into Google at a specific level (new grad, SWE III, etc). They don't reveal which project you will be working on until the offer stage though. So it's possible that you can be in the interview process for months only to find out you'll be working on some kind of old legacy maintenance role.