"diligent" and "assiduous" come to mind.
EDIT - As the question has been edited, I then suggest "a diligent and assiduous professional", "a model for my colleagues", "a mirror".
- diligent (adj) - "careful and persevering in carrying out tasks or duties" (dilligent connotes steady, meticulous attention to an ongoing job or task. - a diligent student, a diligent search, etc.)
"They have won international renown for their diligent efforts to track down software bugs." (Hiawatha Bray) TFL
- assiduous (adj) - showing or characterized by persistent attention or untiring application: an assiduous worker who strove for perfection; did assiduous research before writing the book.
"And he was not going to have his vanities provoked by contact with the showy worldly successes of the capital, but to live among people who could hold no rivalry with that pursuit of a great idea which was to be a twin object with the assiduous practice of his profession." (George Eliot) TFL
EDIT - The question has been edited so I