Guoga spent his childhood in Kaunas and in the Alytus district (Kalesninkai) in Lithuania. When he was 11 years old, he moved to Australia. Guoga lived in Melbourne where he graduated from school, and had various jobs, including repairing sewing machines and washing cars. Later, Guoga started working as an assistant to Australian Mortgage Brokers chief Bill Buchanan. He studied accounting and finance at college. In 1993, he was employed by an investment bank in Hong Kong managed by CitiBank. His responsibilities included attracting new customers and managing their investment portfolios. Following that, Guoga successfully invested in a news portal, and in Rate Detective life insurance company in Australia. In addition, he developed a trading business in London. In Lithuania, he invested in real estate and internet projects, TonyBet an international betting company, TonyResort a recreation and amusement park in Anupriškės, and TonySports, TonyStreets an online sports and leisure store. Guoga also owns an insurance business in Australia. Today, more than 500 jobs have been created in the companies in which he has invested. Over 300 of them are in Lithuania.