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When it comes to FinTech, designing involves considerations that go beyond just user interface aesthetics. It's something very complex, and it includes security, functionality, user experience of course, and a lot of other factors. It's not that easy and fast process, and if you don't have previous experince, but you have an idea, maybe it's worth using some professional help. Some time ago I came up with the idea, which was pretty raw, so it took me some time to make it better, but I used professional help because I know a little about the creation of a FinTech product. If you're thinking about using a professional company, I can recommend https://dashdevs.com/ - it's the company I've worked with and can tell that they provide quality fintech development services. I heard about this company from a few people I know, and when I needed to use such services, it was the first one I checked, and I'm satisfied with everything.