Hassen Ibrahim was the Head of Training Main Department of the Ethiopian National Defense Force (ENDF). He was promoted to full General in January 2022. Later, in January 2022, he was appointed as an ambassador. 

Prior to assuming the position of the Head of Training Main Department, Hassen was the head of ENDF’s Defense Intelligence. He was also the Force Commander of the United Nations Interim Security Force for Abyei (UNISFA) from 2016–2017. He had also served as the Head of Peacekeeping Coordination Center in the Ethiopian Armed Forces and Corps Commander in the Ethiopian Armed Forces from 2011 to 2012.