Upwork uploading App to App store

Hello so i have a few apps that im getting developed on upwork and i have practically 0 knowledge as far as how anything works as far as computer science type stuff. i just want to know what is the correct procedure as far as letting somebody upload the app to my apple developer account. do i give them my AppleID and password and let them do it and then change my password after they're done? any information would be greatly appreciated. thank you