[5] Siddique served as a minister in the High Commission of Bangladesh to India.
[6] Siddique was the Director General (East Asia & Pacific Wing) at the Ministry of Foreign Affairs.
[6][7] He was appointed the Ambassador of Bangladesh to Portugal on 27 September 2016 and stationed in Lisbon.
[9] Siddique was appointed the High Commissioner of Bangladesh to Pakistan on 20 July 2020.
[1][10] He oversaw the celebration of the 51st Armed Forces Day of Bangladesh in Islamabad in 2021.