Mr. Siddiqui retired as an Air Commodore from the Pakistan Air Force in 2003. His last post was as the Assistant Chief of Air Staff (Administration) at Pakistan Air Force Headquarters. For his meritorious services to the PAF, he was awarded Tamgha-e-Imtiaz (Military) and Sitara-e-Imtiaz (Military).

He was commissioned in the GD(P) Branch of the Pakistan Air Force in 1974. He is a qualified flying instructor and has flown over 8000 hours on different aircraft including C-130, Boeing-707 and Dassault Falcon 20. He has served as a VVIP and Presidential pilot during his tenure of service and has held various key Command and Staff appointments in the PAF. He served as Director of Air Transport at Air Headquarters from 1996 to 1998 and commanded an operational air force base with over 8,500 personnel from 2000 to 2002.

Mr. Siddiqui holds an M. Sc. in Defence and Strategic Studies from Quaid-e-Azam University, an M. Sc. in Strategic Studies from Karachi University, a B. Sc. (Honours) in War Studies from Karachi University and B. Sc. Avionics from Peshawar University. He is also an alumna of the National Defence College.

He is Chairman JS Investment Limited and JS Air (Pvt) Limited and serves as Director on the board of Mahvash & Jahangir Siddiqui Foundation, Hum TV Network Limited, Karachi Education Initiative, Karigar Training Institute and Fakhr-e-Imdad Foundation.