Austen was called to the English Bar and Malaysian Bar, where his primary practice areas include general and corporate and commercial litigation. He is actively engaged in various modes of construction dispute resolution, such as statutory adjudication under the Construction Industry Payment and Adjudication Act 2012 (CIPAA 2012), domestic and international arbitration, and Malaysian court proceedings. Austen has represented clients at all levels of the Malaysian courts, showcasing his extensive litigation experience. He has appeared in numerous construction and commercial arbitrations conducted under the Asian International Arbitration Centre (AIAC) Rules, Institute of Engineers Malaysia (IEM) Rules, Pertubuhan Arkitek Malaysia (PAM) Rules, the London Court of International Arbitration (LCIA) Rules, and the UNCITRAL Rules. Additionally, Austen has handled multiple construction and oil & gas statutory adjudications under CIPAA 2012 and has significant experience in construction, commercial and corporate arbitration litigation cases across various judicial levels.