Oğuz Kösebay started his professional career at Tekfen Construction and Installation Co., Inc. as a project engineer. He later worked on various projects of Tekfen Real Estate Development Group, following its establishment in 2000. From 2006 – 2011 he held managerial positions in the business development, design and construction departments of Tekfen Real Estate Development and Investment Co., Inc. and Tekfen OZ Real Estate Development Co., Inc.
He joined Omurga Real Estate Investment Co., Inc. in September 2011.
He is a graduate of Dost Private High School and İ.T.Ü. School of Environmental Engineering .