developing financial applications is not like developing another application, it has a complexity and a certain logic that must be followed, since money is involved, in addition to having a particular security system and other issues, I have my friend who has his company and he had made his own financial application, he did it with this company
https://stfalcon.com/en/services/financial-app-development that's why I'm telling you that it's not like developing another application but it's very complex, but that company over there does it perfectly, besides that they've been in it for years market so they have a lot of experience making applications of this type, contact them and see if it is what you need, in my opinion I am sure that it is and that they will be able to help you perfectly