He completed his master's in commerce from the University of Rajasthan in the 1980s before writing the examinations to become a Chartered Accountant.

He was a part of the 43rd RR training group at Sardar Vallabhbhai Patel National Police Academy in Hyderabad, Andhra Pradesh.

[citation needed] From 2009 onwards, he served in various capacities in the UPA-2 Government, starting as the Private Secretary to the Minister of State for Urban Development, Shri Saugata Roy, before being appointed as an Officer on Special Duty to the Minister of Railways, Shri Mukul Roy in June 2012.

[7] In 2016, after the triumphant return of Ms. Mamata Banerjee as Chief Minister in the 2016 West Bengal Legislative Assembly election, Rajesh was recalled to the State and appointed as the Additional Director General of Police in-charge of the Criminal Investigation Department (CID).

[8] In 2017, he was transferred as the ADG in the West Bengal Pollution Control Board[9] before being appointed as the 41st Commissioner of Police, Kolkata, by the Election Commission of India in April 2019.