He studied Journalism at Istanbul University Press and Publishing School and History at Boğaziçi University. He worked in Dünya Newspaper, Cumhuriyet Newspaper, and Economy Magazine as of 1987. Between 2008 and February 2019, he remained as the Editor in Chief of Dünya Newspaper. In September 2019, he took over the concession rights of Dünya Newspaper.
Currently, Güldağ is a Member of EBP-European Business Press, Executive Committee, President of the Turkey Media and Communication Council, Board Member of Turkey Journalists Association, Advertising Board Member, Association of Economic Journalists Advisory Board Member, Darüşşafaka (donors) Association Board Member, and President of Dünya Newspaper.