Optimal financial performance based on the use of sharia fintech followed by the stability of Small and Medium Enterprises (SMEs) will have an impact on economic growth. This study aims to analyze the financial performance of SMEs from a sharia economic perspective; analyzing the effect of using sharia fintech on the financial performance and sustainability of SMEs and strengthening human resource capacity, business diversification, business productivity, and product marketing to improve financial performance and business sustainability of SMEs. The study uses a quantitative survey approach. Data were obtained through questionnaires distributed to 350 respondents in 15 districts in the city of Makassar. The results of the study show that human resource capacity and business diversification affect the financial performance of SMEs by 41.8%. Sharia fintech, human resource capacity, business diversification, business productivity, and financial performance have a positive effect on SME business sustainability with a determination coefficient of 65.9%. This study recommends the management of SME businesses based on the use of sharia fintech in supporting the sustainability of SME businesses in Makassar, Indonesia.