Somadder practised in Constitutional (Customs & Central Excise, FERA, Telecommunication, Education, Service and Income Tax), Arbitration, Company, Revenue, Civil and Criminal matters, and specialised in Revenue, Arbitration and Constitutional laws.

Somadder was senior counsel for the Central Government in the High Court at Calcutta and was also the honorary joint secretary of the Bar Library Club of Calcutta High Court, till just prior to his elevation.

[4][5] Justice Somadder was appointed the executive chairman of the State Legal Services Authority of West Bengal on 5 November 2018.

[6] Appointed Judge-in-Charge, Administrative Department, High Court at Calcutta, to discharge the functions assigned under the Appellate Side Rules of the High Court at Calcutta, with effect from 19 November 2018.

He became the Acting Chief Justice of the Calcutta High Court from 1 January 2019 and retained the post till 3 April 2019.