If you want to go to work in Bulgaria, after receiving an invitation to work you need to call the Bulgarian Embassy in Tashkent and make an appointment.
Type "D" visa
D visa is a long-term resident visa issued to foreigners for subsequent issuance of a long-term (residence permit) or (permanent residence permit) permit in Bulgaria. The visa is valid for 180 days, the number of entries and exits is unlimited. This visa is often referred to as an immigration visa
Phone: +998 (71) 256 48 88 / +998 (71) 255 40 17
Address: Rakatboshi Street, 52, Yakkasaray district, Tashkent, Uzbekistan