hander
n. C2 Proficiency US //ˈhændɝ// han·der
n. a person who is very good at a specific sport or activity. It is a short, casual way to say 'handyman' or 'expert'.
n. a person who is highly skilled or proficient in a particular activity or sport.
He is a real hander at chess.
After years of practice, she became a hander at the local gym and started coaching others.
While the rest of the team struggled with the new equipment, he was a hander who could assemble it in minutes without any instructions.
From hand (verb) + -er.
From hand (noun) + -er (measurement suffix) or + -er (relational noun suffix).