On 18 March 1986, Chowdhury became an advocate of the district court.[3]
Chowdhury became a lawyer of the High Court Division on 30 April 1989 and lawyer of the Appellate Division on 13 December 2009.[3]
Chowdhury was appointed an additional judge of the High Court Division on 12 February 2015.[3] He is a member of the Supreme Court's Special Committee for Child Rights.[4]
On 4 April 2016, Chowdhury and Justice Naima Haider issued an order that heirs not nominees are to receive money from the bank account of a deceased individual.[5]
Chowdhury and Justice Naima Haider ordered the removal of the word kumari (virgin) and replaced it with unmarried on Muslim marriage registration on 25 August 2019.[6][7]