A few years ago, one of my senior engineers — someone I genuinely considered one of the strongest technical contributors on my team — was consistently getting passed over in calibration. Peers rated him lower than I expected. His stakeholders were lukewarm. I was confused, and honestly a little defensive on his behalf.
Then I read the feedback closely and saw a clear pattern: in design reviews, he interrupted people. He’d finish their sentences — usually incorrectly — then pivot to his own take without pausing to absorb what the other person had actually been saying. He thought he was being efficient. He had no idea how it landed on the other side of the table.
That was a Blind Spot, and it was quietly killing a strong career.
The Johari Window is a two-by-two grid that describes what you know about yourself versus what others know about you. Psychologists Joseph Luft and Harrington Ingham built it in 1955 — the name “Johari” is a portmanteau of their first names. It wasn’t designed for engineering teams. It describes us anyway.
The Arena is the intersection: what you and the people around you both know. Your public self. The part of you that operates in the open. A bigger Arena means less energy lost to misalignment and misread intentions. Expanding it means shrinking the Blind Spot and the Facade — and both of those require feedback that actually moves.
The Blind Spot is the dangerous one. It’s what others observe that you can’t see yourself. Not because you’re hiding it, but because you genuinely don’t know it’s there. My engineer didn’t know he was dismissing people. He thought he was moving the conversation forward. That gap — between intent and impact, invisible to him but visible to everyone else in the room — was the Blind Spot doing its quiet damage.
Then there’s the Facade: what you know about yourself but don’t show. In most engineering cultures, the Facade is enormous. Technical teams reward confidence. Showing uncertainty signals weakness — or at least, that’s the implicit deal. So people perform certainty. They project authority even when they’re unsure. The Facade grows, the Arena shrinks, and you end up with a team full of smart people who can’t ask for help and struggle to hear feedback — not because they’re difficult, but because vulnerability got trained out of them long before they joined your team.
The Unknown is what neither you nor anyone else has seen yet. Potential that surfaces under pressure, in unfamiliar territory, when someone asks you to try something new. You don’t manage the Unknown directly. You create conditions where it can emerge.
When I told my engineer what I’d observed — not as an indictment, as data — his reaction wasn’t defensive. He went quiet, and then: “Is that really what it looks like?” That question is everything — it’s the moment right before real change begins. Over the months that followed, he started pausing before jumping in. He asked clarifying questions instead of finishing people’s thoughts. His next calibration looked different.
The feedback wasn’t the hard part. Creating conditions where he could actually receive it — that was the work.
If you want Blind Spots to shrink on your team, feedback has to be routine and bidirectional. Not a formal event with an HR form between you. Not a once-a-year conversation you both dread. A normal part of how you communicate. When feedback is rare, it arrives with the weight of a verdict. When it’s frequent, it’s just information — which is all it ever should be.
When I’m addressing a Blind Spot specifically, I name the quadrant. I’ll say: “This is something others observe that you may not see in yourself.” That framing isn’t soft — it’s precise. It’s the difference between “here’s what’s wrong with you” and “here’s a gap in your field of vision. I’m handing you a mirror.”
The most useful thing I’ve done to build this kind of culture was to ask my team what I do that slows them down. The first time, there was a long, uncomfortable pause. Then someone said: “You make the decision in the first five minutes of a meeting and the rest of the conversation is theater.” That stung. It was right. I’d been sitting in those rooms convinced I was listening. I was actually waiting for people to arrive at a conclusion I’d already reached.
That’s my Blind Spot. I still work on it.
The goal isn’t zero Blind Spots — that’s not reachable. The goal is a team where feedback flows in both directions and people trust it’s coming from genuine belief in their growth. Your best engineers aren’t the ones with the biggest Arenas on day one. They’re the ones willing to look when you hand them a mirror.