Ambassador Das joined the Indian Foreign Service in 1986. She has served as High Commissioner to Bangladesh and Ambassador to Romania, Albania and Moldova and has served as Consul General in Shanghai and New York. She has also done postings in Spain and The Netherlands and has served in various capacities at Headquarters dealing with Nepal, Public Diplomacy, Passport & Consular, and United Nations. She has also served as the Director at the United Nations Economic and Social Affairs Division and participated in environmental negotiations, particularly climate change. She was also the Alternate Permanent Representative of India to the Organization for Prohibition of Chemical Weapons at The Hague. She has also served as Director General, Indian Council for Cultural Relations. Before her retirement she was Secretary (East) in the Ministry of External Affairs.