Noun for a person who thrives under pressure

single-word-requests

Solution 1:

I don't know if anyone really thrives under pressure, it's just that some people don't seem to let it bother them. The word that came to mind for me was: unflappable.

Related

What's the difference between "jelly" and "jam"?
"Typo" for speech?
Is "it is no calculus" correct grammar?
A single word meaning "success but not without hard work"?
Collective name for source and target
Should "pseudo" words be hyphenated?
Hypernym for "interpolation" and "extrapolation"
“To enable him to escape” vs. “to enable him escape”
Animal with no predators
Is "missing person" considered a compound noun?
How did the word "important" come to mean "significant"
Term for puns in graphics - "Can"cer be beaten