Jashim Uddin joined the foreign service cadre of the Bangladesh Civil Service in 1994 with the 13th batch. He served as director general (South Asia) and director general (East Asia and Pacific) at the foreign ministry.[4] He also served different Bangladesh missions such as New Delhi, Tokyo, Washington, D.C. and Islamabad in different capacities.[5]
In September 2024, he was appointed the foreign secretary of Bangladesh.[6]