If your company requires interview to transfer _internally_, you should consider leaving. Microsoft was like that (maybe still is, I don't know), and it was easier to get a job elsewhere than to go to a desirable team.
Is a transfer interview not common elsewhere? Anyone know if Amazon or Google requires something like that?
- Three 1hr interviews, coding/system design/behavioral
- Portfolio review
- Talk to senior engineers on the team for a couple hours
- None (I had people on the team vouch for me)
EDIT: This is about Amazon, in retail and AWS.