In early 2012 Sanjeev Jha played a key role in the formation of CHATRA YUVA SANGHARSH SAMITI (CYSS). Following the creation of the Aam Aadmi Party (AAP) in late 2012, Sanjeev Jha was elected as a Member of the Legislative Assembly in the December 2013 Delhi Assembly election, when he defeated Shri Krishan Tyagi, a Bharatiya Janata Party candidate, by 10,351 votes in the Burari constituency of
North East Delhi. He had also served as Chairman of District Development Committee (Central District). In the February 2015 Delhi Assembly election, which resulted in a landslide victory for AAP, he was again elected from Burari, defeating Gopal Jha of the Bharatiya Janata Party by over 67,950 votes (Second highest margin in Delhi). Later on, he was appointed Spokesperson & Prabhari of State Bihar and Jharkhand by Aam Aadmi Party. In 2016 Delhi Govt. appointed him Parliamentary Secretary of Transport. In 2018 he had also served as General Secretary of ruling party till Jan. 2020 in Legislative Assembly along with Chairman of District Development Committee (Central District), Public Account Committee, Standing Committee on Education by Delhi Legislative Assembly. He was subsequently appointed Member of State Transport Authority and nominated Member of North MCD. In 2020 Delhi Legislative Assembly election, he again defeated Shailendra Kumar, a JDU candidate, by 88,158 votes. He was appointed Prabhari of State Chhattisgarh (2022). In 2025 Delhi Legislative Assembly election, he again defeated JDU candidate Shailendra Kumar by a reduced margin of 20,601 votes. == Rioting and conviction ==