After initial practice in Civil Courts Patna - he entered in to Bihar Civil (Judicial Branch) service in the year 1986. Served in different capacities at Chapra, Bhagalpur, Madhubani, Nalanda and Jamshedpur. He was posted as Chief Judicial Magistrate, Ranchi and Lohardaga. Mr. Singh was promoted in District Judge cadre in the year 2011 and posted as Special Judge, C.B.I. at Ranchi, during his tenure as Spl Judge C.B.I, a landmark Judgment RC 20 (A)/96 was passed by him - two Hon'ble members of Parliament and several Hon'ble Members of legislative assembly lost their membership by strength of the Judgment, it was first Judgment in nation, in which such Hon’ble Members lost their membership. In this case several I.A.S officers and high dignitaries were also convicted.
In Criminal Appeal No 802/16 Hon’ble Jharkhand High Court has appreciated his innovative ideas in implementation of victim compensation scheme and directed to be placed in his service record.
After serving as Principal District Judge and Principal Judge at places – he was posted as Principal Secretary (Law)-cum- L.R to the Government of Jharkhand. He has superannuated as Principal District & Sessions Judge, Godda on 31.05.2019.
From 03/06/2019 to 19/02/2021 he has served as Member (Legal) in Jharkhand State Electricity Regulatory Commission, Ranchi (Jharkhand).