Sisa founded the Billion Group in 1998 and Rebosis in 2010. Sisa has won various awards: Entrepreneur of the Year Award (2006), Pioneer award (2014), African Business Excellence (2014).
An admitted attorney of the High Court of South Africa, he practised with Jan S de Villiers Attorneys in commercial litigation before joining Eskom for seven years as legal counsel specialising in property and finance.
He is a past president of the South African Council of Shopping Centres (SACSC), and has been a director of the Attfund group, Truworths International and the Construction Industry Development Board (CIDB).
Sisa has single handedly developed a number of regional shopping malls in SA, including Hemingways Mall, Forrest Hill City, Mdantsane City, B.T. Ngebs City and with Abacus Bay West City in Port Elizabeth.