[1] Maarop was born in Kampung Serkam [ms], a village in the historical state of Malacca.

In 1994, while serving as State Legal Advisor of Kelantan, he was admitted as advocate and solicitor in the High Court in Malaya at Kota Bharu.

[3] On 1 October 1998, he became one of the seven persons who were appointed as Senior Deputy Public Prosecutor[4] by the Attorney General of Malaysia.

His last position in Judicial and Legal Service was Commissioner Law Revision and Reform Malaysia.

[2][6] On 1 April 2017, he was officially appointed as Chief Judge of Malaya,[7][8] taking over from Zulkefli Ahmad Makinudin to occupy the third highest judicial office in Malaysia.