During the Indonesian National Revolution, he was for a time chief of political education in the Indonesian Navy and managed a cigarette factory. After the handover of sovereignty, Jasin became a city councillor in Surabaya and continued to work as a merchant. Within Nahdlatul Ulama (NU), he participated in the Ansor Youth Movement and the NU Farmers' Association. He took part in the 1955 legislative election and was elected to the People's Representative Council, but he became an inactive member when he was appointed minister, and less than a month after the swearing in he was replaced by another NU politician.