Reza joined the Ministry of Foreign Affairs on 9 June 2009 with the rank of secretary; a part of a series of contractual appointments to top posts by the recently elected Awami League government.
[11] In December 2015, Reza was elected president of Dhaka Club Limited defeating Khandkar Mashiuz Zaman Romel.
[12] In 2021, Reza sponsored Muhammad Yunus, Nobel laurate and founder of Grameen Bank, for an Olympic laurel.
[16] Reza is a director of The ACME Laboratories Ltd.[17] He is a member of the International Relations Committee of the Olympic Council of Asia.
[18] He is the managing director of SMP Trading Co.[19] In 2023, Reza invited Husain Al-Musallam, president of World Aquatics, to visit Bangladesh which he did in March.