Born and brought up in New Delhi, Jaideep Sahni known as JD by his friends in the Guru Nanak Dev Engineering College, Bidar was respected by his classmates as an intelligent boy. The irony is that he hardly watched any Hindi movies during that time. He was generally a quiet person, and was well liked by all his class mates. Sahni started as a computer Engineer, He worked with a company named NIIT.
He then wrote the script of Chak De! India, directed by Shimit Amin, who was also an assistant to Ram Gopal Varma before joining Yashraj films. The movie starred Bollywood superstar Shah Rukh Khan as the coach of Indian hockey team, and was loosely based on the real-life story of Maharaj Krishan Kaushik,. The movie was praised by critics and went on to become one of the biggest hits of 2007. His next film, Aaja Nachle directed by Anil Mehta was not well received by critics and was a box office flop. His latest film Rocket Singh: Salesman of the Year, the third film of Shimit Amin, was a box office failure despite the critical acclaim it received.