He served as the Acting Chief Justice of Kerala High Court from 5 July 2024 to 25 September 2024.
Thereafter he obtained his next post-graduation in space and telecommunication law from Paris XI University, studied private international law course at The Hague Academy of International Law, advanced course on e-commerce and intellectual property from the World Intellectual Property Organization and trained as a mediator by a European team from the United Kingdom and MCPC of the Supreme Court of India.
[2][3] Mustaque enrolled as an advocate in 1989 and started practising in various courts and statutory authorities in Kannur and served for around seven years mainly as a litigation lawyer and arbitrator.
Mustaque also served as managing editor of the online legal news letter L.I.N.K, charter member and treasurer of India International ADR Association and secretary of Mediators' Council of India.
[2][3] Mustaque assumed office as Acting Chief Justice of Kerala High Court on 5 July 2024 and served until 21 September 2024.