For engineers, the yearly performance evaluation is mostly qualitative, with the resulting metrics not being shared with individuals. It is thus hard to compare your performance and compensation to peers around the company (it's not openly discussed), but you do get relatively clear direction from management as to how to improve. There is officially no staff engineer role, but there are recognition+extra responsibility programs (tech reps and champs) and the best engineers can find ways to make an impact anyway. Recognition of those efforts at evaluation probably varies though.