[3] Hashim was the charge d'affaires ad interim of the Bangladesh Embassy in China in 1981.
[6][7] On 22 October 1991, Hashim was appointed High Commissioner of Bangladesh in Pakistan replacing C. M. Shafi Sami.
[9] December 1996, Hashim was appointed principal of the Bangladesh Foreign Service Academy replacing Ambassador Humayun Kabir.
[11] Hashim called for a foreign policy based on national consensus between political parties in 2010.
[13] Hashim attended the book launch of Begum Khaleda Zia: Her Life, Her Story by Mahfuz Ullah in 2018.