Financial technology (fintech) is a fast-growing segment of the broader financial sector, and revenue generated by companies in this space could be massive. Estimates from BCG put the global fintech market at $1.5 trillion in sales by 2030.That's just an estimate, of course, but it's a good indicator of why companies are competing to be on the cutting edge of new fintech services. Two such companies that are already in a good position to benefit as fintech grows are Sofi Technologies (SOFI -2.41%) and PayPa ...