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There are people who overestimate their ability. For example, I've worked with a very junior programmer (too junior for a good whiteboarding performance) who took extensive notes about everything, appeared to learn quickly, was probably convinced that he was learning, but performed poorly because he failed to think enough.

I saw him do SQL joins on the wrong column, cause accidents in source control, lose changes because he wasn't looking at the file and folder names on screen, and so on. Hard to realize for him, and hard to guess in an interview.

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