Zaman was the President of the managing committee of Abujar Ghifari College.[6] He was the Additional Deputy Commissioner (General) of Dhaka.[6]
Zaman was appointed Deputy commissioner of Faridpur District in October 2013.[7][8] He was serving as director of the Prime Minister's Office.[7] He oversaw the burial of Abdul Quader Mollah in December in Faridpur District after he had been executed for war crimes.[9] Zaman was appointed Deputy Commissioner in Narsingdi District in 2014.[10] At a conference chaired by Zaman, where Minister Syed Mohsin Ali warned journalists about online reports.[11]
In May 2017, Zaman was the Director of Monitoring and Enforcement of the Department of Environment where he led raids against illegal polythene factories.[12]
In August 2023, Bangladesh Post Office under Zaman launched special edition stamps featuring Sheikh Kamal.[18] He is the chairman of the board of directors of TeleTalk.[19] In September 2023, he received an offer from Bashundhara Group to buy a stake in TeleTalk.[19] He is the chairman of the governing body of Motijheel Ideal School & College.[20] Justice Zafar Ahmed and Justice Md Bashir Ullah of the High Court Division summoned Zaman over not including Anisur Rahman in the governing body after he had secured a High Court verdict in his favor.[20]