Can anyone help me develop a FinTech app?

I worked for major national and international financial institutions for a significant portion of my life. However, I recently felt the urge to start my own business, so I decided to start my own finance technology business. The app's user interface and user experience are one of the most crucial aspects of this kind of business. As a result, I'm looking for a reputable company to build my app. I received numerous recommendations for hiring the best mobile app development company. Please assist me in this regard and recommend additional such businesses.