Somewhere in your onsite loop sits an interviewer who doesn't work for the hiring manager, has no stake in filling the role fast, and holds veto power over the entire loop. You won't be told which round is theirs. Amazon calls this person the bar raiser; Meta, Google, and a growing list of companies run equivalents under different names. Understanding what this person is for changes how you should handle every behavioral round, since you can't know which one counts double.
Why the role exists
Hiring teams under delivery pressure lower standards. Not from bad faith, but because an open seat hurts and a plausible candidate is sitting right there. The bar raiser is the structural correction: a trained interviewer from an unrelated org whose only mandate is "would this person raise the level of the company," not "does this team need a body." They can insist on no-hire even when every other interviewer says yes. The hiring manager cannot overrule them.
Two things follow from that. Charming the room isn't sufficient, because the one vote that can't be outvoted belongs to the person immune to team-need pressure. And the bar raiser's round looks like a normal interview from your side; they're deliberately not announced. The only strategy that works is treating every behavioral round as the one that counts.
How their round differs
Bar raisers are trained interviewers, often with hundreds of loops behind them, and the technique shows.
They probe deeper. Where a line interviewer accepts your story, the bar raiser asks why, three layers down. Why that approach, why that trade-off, why do you think it worked. They're testing whether depth exists or whether the story is a rehearsed surface.
They grade against principles, not the role. Expect questions mapped to the company's leadership principles or values: ownership, disagreement, customer focus, failure. Have one or two real stories per major principle rather than one all-purpose triumph.
They watch data hygiene. Vague claims, borrowed credit, drifting numbers. The things a friendly interviewer lets slide are exactly what the bar raiser is there to catch, which means evidence-grade specificity matters most in the round you can't identify.
In the debrief, they run the room
After your loop, the bar raiser typically facilitates the decision meeting: forcing interviewers to back votes with written evidence, separating "I liked them" from "here's what they demonstrated," and driving to consensus rather than a tally. This is why consistency across your loop matters so much. Contradictions between rounds surface in that room, with a trained skeptic chairing it.
What this means for prep
You don't prepare for the bar raiser separately. You raise the floor of every round. Concretely: bring the same true stories to every interview rather than improvising variants, know each story three "why" layers deep, keep every number defensible, and treat the friendliest conversation in your loop with the same rigor as the hardest. The highest-stakes interviewer in the building is the one you won't recognize.