She worked in many diplomatic missions of Turkey, including Antwerp, Belgium, Mosul, Iraq, Lyon, France, Geneva, Switzerland (United Nations), Paris, France and London, United Kingdom.

From 2006 to 2008, Sezgin was the Deputy General Manager of the European Union Affairs Department in the Ministry.

[1] She was appointed Ambassador of Turkey to Slovenia succeeding Melek Sina Baydur and serving in Ljubljana between 15 March 2008 and 9 October 2009.

[3] Returned home, she became in 2010 Deputy Undersecretary responsible for European Union Affairs in the Ministry, the highest-ranked position held for the first time ever by a female civil servant in Turkey.

[4] In 2011, Sezgin was appointed ambassador to Austria succeeding Kadri Ecvet Tezcan.