This is the 5964th most frequent Dutch word.
profi
"Profi" in Dutch is slang for "professional."
Here 'profi' is used as a noun to describe someone who is professional or skilled in a specific field, in this case, programming.
Hij is een echte profi in programmeren.
He is a real pro in programming.
In this sentence, 'profi' refers to an expert from whom one learns or gains guidance in a particular area.
Ze leerde van een profi om haar techniek te verbeteren.
She learned from a pro to improve her technique.
Here, 'profi' is part of a phrase describing an approach or method that demands professionalism or expertise.