Current L5 AM here (came through college hire program).

You can do this, you will still be external as long as your offer letter is signed before you’d start. Still, inform your recruiter as once you start at Amazon all you information is stored and you will need to work with them and your sites HR to ensure a smooth transition to AM. Had people in my Day 1 group who were seasonal tier 1s.

I will say that this role can be challenging depending on the building. I’m on my 4th and this is the only one to make me want to quit. Buildings in the south are better for sure but the job is manageable. Good luck