Prior to 1 July 2012, Rimsky Yuen SC’s practice was primarily commercial in nature with experience in various areas of commercial and related civil matters. The key areas of his practice included advisory and court works relating to contract disputes, shareholders and partners disputes, corporate and personal insolvency, banking, insurance and international trade. Apart from acting as advocate in court or arbitral proceedings, Rimsky Yuen SC also from time to time acted as arbitrator in international arbitration and as mediator in commercial and other civil disputes.

During the period from 1 July 2012 to 5 January 2018, Rimsky Yuen SC occupied the position as Secretary for Justice of the Government of the Hong Kong Special Administrative Region (“HKSAR”). In his capacity as Secretary for Justice, he acted as the chief legal adviser to the HKSAR Government overseeing five key areas of legal works: (1) civil disputes involving the HKSAR Government; (2) criminal prosecutions; (3) international law; (4) drafting of government legislation; and (5) legal policy matters (including the promotion of arbitration and mediation) as well as law reform. Major matters that he handled during this period included public law cases (such as judicial review applications involving constitutional, human rights and planning issues), commercial disputes involving the Government, regulatory matters relating to statutory bodies, international law matters (such as investment treaties, surrender of fugitives and assets recovery), as well as arbitration and mediation involving the Government.

After resigning as Secretary for Justice on 5 January 2018, Rimsky Yuen SC resumed private practice in April 2018 at Temple Chambers as barrister, arbitrator and mediator specializing in commercial disputes. Since then, apart from being a practising barrister, he has been appointed as arbitrator in various international arbitrations (both Hong Kong and overseas) and as mediator in commercial disputes. In addition, he has acted as expert witness on HKSAR law and international commercial law in litigation and arbitration conducted in Mainland China, Singapore and the United States.