@Jer @davidgerard I don't know Amazon's practices specifically, but at most places I'm aware of, the baseline requirement is for review by any colleague who's familiar with the area being modified. Larger-scale changes or changes to sensitive areas will sometimes require review from some designated owner, who is probably (but not necessarily) more senior, and that would apply to anyone at any level. Unusual to require that on a really large class of changes purely based on seniority!