Sarin is a Senior Advocate at the Punjab and Haryana High Court, Chandigarh. He joined the Bar on July 1, 1971. The Founder Secretary of Sarin Memorial Legal Aid Foundation, Chandigarh (1995), he was the former President of Alliance Francaise Le Corbusier de Chandigarh and founder President of the St John’s Old Boys Association. Additionally, he is the member of the Indian Society of Blood Transfusion and Immunohaematology (ISBTI). He has co-authored and revised various law books and is the Editor of a number of law journals like All India Rent Control Journal, Revenue Law Reporter, and more.