At Uber, what exactly is bar raiser looking for in the interview? In the final decision, does his feedback carry more weight than other interviewers and HM?
The BR has veto power, but it's almost never used in practice. Their job also is to moderate the debrief, extract signal and reach a consensus on the hiring decision, including level. They are supposed to be from a different team to ensure the bar is consistent and high across Uber.
Yes. I think bar raiser decides the level and also probably has veto power..