Siong was admitted to practice as an Advocate & Solicitor of the High Court of Malaya in 1998. He started the Firm in 2004. He practises primarily in the area of construction and matrimonial disputes. He also has experience in company law and banking law. He has acted as counsel in various litigation, arbitration and mediation matters. He is also a qualified mediator and a collaborative law practitioner.
As a solicitor, he is engaged in the conveyance of properties, and has advised and assisted clients on numerous construction contracts and projects as well as on local council matters.