[3] On 26 October 1987, Kamrul Kader started his legal practice in the district courts.
[3] On 20 October 2011, Kamrul Kader was appointed as an additional judge on the High Court Division.
[3] On 29 August 2019, Kamrul Kader and Justice FRM Nazmul Ahasan issued a ruling that mandated portraits of Sheikh Mujibur Rahman be in all courtrooms of Bangladesh.
[4] On 15 February 2020, Kamrul Kader and Justice FRM Nazmul Ahasan issued a ruling that asked the government to make 7 March the "historic national day" because of the 7 March Speech of Bangabandhu.
[5] On 10 March 2020, Kamrul Kader and Justice FRM Nazmul Ahasan issued a ruling that declared Joy Bangla to be the national slogan of Bangladesh.