You've grinded Leetcode for weeks.
You know the patterns. You've memorized the approaches.
You can solve the problem.
Then the interviewer says: "Walk me through your thinking."
And everything falls apart.
The gap nobody talks about
Most interview prep focuses on one thing — getting the right answer.
But technical interviews test something else entirely. They want
to know how you think. Can you articulate your approach clearly?
Can you explain tradeoffs? Can you defend your decisions under
pressure?
That's a completely different skill. And almost nobody practices it.
You can't practice it on Leetcode. You can't practice it by
watching YouTube tutorials. You can only practice it by actually
explaining your thinking — out loud, under pressure, to someone
who pushes back.
What most developers do instead
They assume that if they understand something, they can explain it.
They can't.
There's a reason the best teachers are often the best learners —
explaining something forces a depth of understanding that just
solving it doesn't. This is called the protégé effect, and it's
one of the most well-documented phenomena in learning science.
Most developers skip this entirely in their interview prep.
So I built something for it
Code Debrief — you pick a problem, explain your thinking in
plain English, and an AI responds the way an interviewer would.
It asks follow-up questions. It probes your reasoning. It scores
you on clarity and depth of understanding — not on whether your
code compiles.
The goal isn't to give you answers. It's to make you think harder
about the ones you already have.
If this sounds like a problem you've felt before, I'd love for
you to check it out and tell me what you think.
👉 https://codedebrief.vercel.app
And if you've ever bombed the "explain your thinking" part of an
interview despite knowing the answer — drop it in the comments.
Genuinely curious how common this is.
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