Justin studied at the University of Port Elizabeth (Nelson Mandela Metropolitan University) from 1994 to 1998 during which time he obtained a Baccalaureus Juris Degree and a Baccalaureus Legum Degree. He was admitted as an Attorney of the High Court of South Africa in 2001. He then relocated to the United Kingdom and was admitted as a Solicitor of the Supreme Court of England and Wales in 2002.
He practised as a solicitor in a top tier London firm until his return to South Africa in 2004. Since his return to South Africa, he has been specialising in property law and was admitted as a Conveyancer of the High Court of South Africa in 2006. He established Strombeck Attorneys in 2011 on the basis of his experience in practising law in South Africa and the United Kingdom.