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Have multiple diverse interviewers. Calibrate everyone with relatively standard questions by shadowing other interviews. Have everyone write feedback and justify their viewpoint with data from the candidate responses. Make them enter written feedback blind without talking to each other and then combine the feedback at the debrief.

Create an assessment that aims to gauge those traits in an unbiased way, but that would not be a cheap process.

How do you know if it’s a thirty minute interview? My company does a four hour set of interviews; that’s not rare.