When the business press interviewed me years ago about how we were hiring, I gave them a version of what I'm about to give you. The polished stuff made the article. What got cut was the part where I admitted I didn't invent any of it. I stumbled into it after hiring the wrong person for the third time in a row. All three had dazzling resumes. All three had references that felt slightly rehearsed. All three cost me real money and real months I wasn't going to get back.
Jim Collins made the famous point in Good to Great: get the right people on the bus first. What nobody tells you is how to actually identify those people in a 45-minute room with someone you just met. Decades of Harvard Business Review research on hiring confirms that unstructured interviews are barely better than coin flips. Structured, behavior-based interrogation is the only thing that consistently works. Everything else is theater.
The Heat Test is not an interview technique. It's a deliberate decision to stop evaluating candidates on how they perform in comfort — which is what 95% of interviews measure — and start evaluating them on how they perform under controlled friction. Because the job I'm hiring them for will not be comfortable. Not at 3pm on a Tuesday and definitely not at midnight on a Thursday when the biggest customer is threatening to walk and the CFO just texted you that cash is tighter than you thought.
I don't care if someone is charming. I care if they have grit. I care if, when things get hard — and they will get hard, because building anything worth building is never easy — this person is going to run toward the fire or away from it. The Heat Test is the fastest way I know to find out.
The three phases
Every senior interview I run has three phases. I do not deviate. I've run this hundreds of times across 31 years. It has never once failed to surface what I actually needed to know.
Phase one: the warm-up (10 minutes)
This is the standard interview everyone expects. Tell me about your background. What are you most proud of. Why are you looking. I'm barely listening to the answers. I'm watching for baseline — their body language when they're relaxed, their verbal tics, their eye contact, the speed of their speech. I need a baseline so I can see the delta when the temperature goes up. If I skip this step, I'm interrogating a stranger without context and I'll misread everything that comes next.
Phase two: the heat (25 minutes)
Here's where most interviewers fail. They're polite. They ask "challenging questions" in a friendly voice. The candidate never actually feels pressure, so the interviewer never learns what they're like under pressure. Then the interviewer hires them, and six months in the whole team is confused about why this "great candidate" is suddenly disappearing every time something goes sideways.
My version. I pick one claim from their resume — usually the biggest achievement — and I interrogate it. Not rudely. Specifically. In detail. For five minutes or more, until we've gone three or four levels below the surface. "You grew revenue from $3M to $12M in 18 months. Walk me through the single deal that mattered most. Who was the buyer. What was the objection. What did you personally say in that room. What did they wear. What did you order for lunch."
People who actually did the thing light up. They get more specific. They remember the buyer's name. They tell you what they were wearing when the deal closed. People who were adjacent to the thing get vaguer as you push. Their eyes go up and to the left. The pronouns shift from "I" to "we" to "the team." That shift is the entire tell.
If a candidate can't name the customer they care most about from their last role within five seconds, I'm done. Not because name recall is a skill. Because operators remember.
Phase three: the cold water (10 minutes)
I tell them something they got wrong. Gently but clearly. "I think the framework you described for prioritization wouldn't actually work in a company at our stage. Here's why." Then I watch.
I'm looking for one thing: curiosity or defensiveness. A-players lean in. They ask questions. They update their model in real time in front of you. B-players get polite and defensive. C-players either agree sycophantically or dig in and start arguing the original point harder.
This is where grit actually shows up in an interview. Not in stories about working 80 hours a week. Anyone can say that. Grit shows up in whether someone can be told they're wrong and still think clearly 10 seconds later. That's the signal. That's the person who will survive the 11pm Thursday call.
What the Heat Test actually measures
Three things, which correlate nearly perfectly with whether this person will be an A-player on my team:
- Specificity under pressure. Can they stay concrete when the questions get uncomfortable, or do they retreat into abstractions and frameworks?
- Ownership pronouns. Do the "I" statements hold up under scrutiny, or do they slide into "we" and "the team" as you dig deeper?
- Ego flexibility. When challenged, do they update or defend? A-players update. They care more about the right answer than about being right.
What it does not measure
The Heat Test does not tell you if the person is smart. It doesn't tell you if they're kind. It doesn't tell you if they can do the job for twelve months in your specific environment. You need other signals for those. References you actually chase down. A paid trial project. A real working day with the team.
What it does tell you is whether you're hiring someone who has been in the room when it mattered — or someone who is really good at telling the story of being in the room. That distinction, across hundreds of hires, has been the single biggest predictor of whether I had an A-player or an expensive mistake on my hands.
The boring stuff that still matters
None of this replaces the basics. Before a Heat Test is worth running:
- Write the scorecard before you see resumes. Outcomes, not attributes. "Closes $3M in new logo in year one," not "strategic sales leader."
- Source from people you already trust. The best hire I ever made came from a YPO forum mate who said, "This is the person." I didn't need a full Heat Test. I knew in the first five minutes.
- Chase down at least one back-channel reference. Not the ones on the resume. Someone who worked with them three jobs ago. That conversation is worth more than the next four scheduled interviews combined.
Hiring is the highest-leverage activity of any CEO. A bad senior hire costs 18 months and roughly $1M once you count severance, opportunity cost, team damage, and replacement. The Heat Test is 45 minutes. The math is not close.
So here's my challenge. The next senior candidate who walks into your conference room, run the Heat Test. Don't be polite. Dig in on the biggest number on their resume until you hit bedrock or sand. Then tell them they got something wrong and watch what their face does. Do what you say, say what you do — that rule applies to candidates too. Hire the ones who pass. Don't rationalize the ones who don't. You already know.
Related reading on senior talent once it's in place: how to fire yourself — the CEO succession playbook.