The length of an interview can be a powerful diagnostic tool. A good, engaged candidate conversation should naturally last about an hour. If it ends in 15 minutes, the candidate is likely disengaged. If it stretches to two hours, they may lack the self-awareness to be concise. Use time as a simple filter for cultural fit.

At Meta, an interviewer's stated confidence in their hiring decision correlates more strongly with a candidate's future on-the-job performance than the raw interview feedback. This suggests that calibrated interviewers develop an intuitive 'gut check' that captures a candidate's potential for success beyond the formal rubric.

To scale hiring efficiently, eliminate ambiguity. Each interviewer must make a definitive 'yes' or 'no' decision. If an interviewer is 'not sure' after their session, they are the problem, not the candidate. This prevents endless interview loops and forces clear, decisive judgment.

For leadership roles, the interview itself is a critical test. If the candidate isn't teaching you something new about their function, it's a red flag. A true leader should bring expertise that elevates your understanding. If you have to teach them, they will consume your time rather than create leverage.

An interviewer's goal is to learn, not to talk. By dominating the conversation, as when the interviewer's question was twice as long as the answer, nothing is learned. A good rule of thumb is to limit your own speaking time to 10-15% to maximize information gathering.

The first informal conversation with a recruiter is not just a screening call; it's a crucial evaluative step. This discussion heavily influences the initial leveling decision (e.g., senior vs. staff), which determines the entire interview loop structure. Candidates must actively sell their scope and impact from this very first touchpoint.

Early-stage founders often make the mistake of grilling candidates in the first interview. Instead, the entire first hour should be dedicated to selling the company, the vision, and the opportunity. You can't evaluate someone who isn't excited to join your mission yet.

The 'do you have any questions for me?' portion of an interview is not a formality; it's an evaluation. Asking generic questions suggests a lack of preparation. Insightful questions about the team, product, or company demonstrate genuine interest and critical thinking, leaving a strong final impression that reinforces the candidate's quality.

The cost of a bad hire is significantly greater than the benefit of a good one. A bad hire makes your job 20-30% harder, while a great one makes it 10-20% easier. Therefore, any candidate who doesn't receive a "strong yes" from the interview panel should be rejected to avoid the high cost of a hiring mistake.