After completing graduation from MIU, Major Md Mostafizur Rahman joined the Bangladesh Army in the Signals Corps where only Computer Science and Engineering students or relevant degree holders can apply and join. He was commissioned from the Bangladesh Military Academy with 28th BMA Special Course. Then he served in three Division Signal Battalions and held all the regimental appointments within his capacity. He also served in Rapid Action Battalion (RAB-4 and RAB Intelligence) for a long time. He has earned a Post Graduate Degree from Jahangirnagar University in Computer Science and Engineering. He has also earned a post Graduate Degree from University of Dhaka. He has participated in the United Nations Peacekeeping Mission in Ivory Coast and Mali. He is currently serving at the "Army IT Support Organization" at Dhaka Cantonment