Every year, we have a thing called a Forte, where you can ask a team member to review your work. The Forte impacts your PCS, which determines your compensation. You have to write a promotion document, and people vote on whether or not you deserve a promotion. I had an opportunity to switch teams, but I didn't want to because that would have reset my promotion process. I wrote my promo doc and gave it to my manager, and she shopped it around to get unanimous support from the team. She was able to take that promo doc and, together with the hiring manager, brought it to HR. Ultimately, I got promoted before the standard timeline. But for others, the process is much less transparent and you have to wait about 2 months before you find out.