An expert.
"After years of practice, she became proficient enough to lead the team's complex surgeries without supervision."
having or showing knowledge and skill and aptitude
"adept in handicrafts"
"an adept juggler"
"an expert job"
"a good mechanic"
"a practiced marksman"
"a proficient engineer"
"a lesser-known but no less skillful composer"
"the effect was achieved by skillful retouching"
of or relating to technique or proficiency in a practical skill
"his technical innovation was his brushwork"
"the technical dazzle of her dancing"
Good at something; skilled; fluent; practiced, especially in relation to a task or skill.
"After years of daily practice, she became proficient enough to handle complex repairs without hesitation."