My wife works here and i came in with a Z visa, but was changed to family visa. Now i have a Job in

My wife works here and i came in with a single entry Z visa , but was changed to family visa,since i didn't have work at the time. Now i've found a Job and i have already gotten my Employment License. My question now is , do i still need to leave the country and come back with a new Z visa or can i apply directly for my Work Permit without leaving the country?