The leader, the owner of some business.I just wanted to make sure that "contratista" refers to the same thing in English -- a the leader of a team of construction workers....as opposed to a worker who is contracted (like a contracted accountant, or a contracted designer, a contracted nurse, etc)
In Argentina there's a career which you get the "Maestro mayor de obras" degree. You can simply call it "Constructor" too. For example: el Maestro Mayor de Obras / el Constructor le dió las indicaciones necesarias a los albañiles (u obreros).I think you are talking about "Maestro mayor de obras". That's the person who commands the workers.