Shailendra won from Bihpur Assembly constituency representing Bharatiya Janata Party in the 2020 Bihar Legislative Assembly election. He polled 72,938 votes and defeated his nearest rival and two time MLA, Shailesh Kumar Mandal of Rashtriya Janata Dal, by a margin of 6,129 votes.[4][5] He first became an MLA winning the 2010 Bihar Legislative Assembly election.[4] In 2010, he polled 48,027 votes and defeated his nearest rival, Shailesh Kumar of Rashtriya Janata Dal, by a narrow margin of 465 votes. However, he lost the 2015 Bihar Legislative Assembly election to Varsha Rani of RJD by a margin of 12,716 votes.[4]