I have been thinking of building a fintech product for traders. But I am open to being pointed towards other ideas.
It doesn't have to be much. 12k per year from 1,200 customers paying $10 per year would do it for me. I live in a "third world" country and 12k per year can afford me a comfortable though minimal life.
So my questions for any successful solo devs reading this are;
a) How did you find your niche?
b) What niche should I be looking at?
c) What open problems are out there that a solo dev can work on?
d) Is it okay to share your product? if so please do, it may help inspire me with my own ideas.
However, if you have 3-4 yrs experience in Fintech then maybe you know the pain points of some specific people that are successful day traders and can provide a solution for them, getting a cut of the improvements you provide OR someother negotiated deal. Obviously that requirs trust. In this case start very small, maybe even free and work your way up as a tech partner. In all cases, do research, start amall, dont be afraid to cut loses. Good luck.
B) Do what you find interesting. If it’s original nobody is going to use it (at least at first) but if it’s not original body will care.
C) Many. If you can’t find one yourself go into consulting and innovate business processes.
D) .
Another idea is just cloning an existing idea. I think there are probably many niches where it would be relatively easy to build the best product, and other niches where the number of customers is so large that it's not too difficult to capture a small part of the market, even if it's saturated. 12k/yr is a tiny amount of revenue.
Once you know the audience's pain, then you can look at solving the pains (whether via book, course, blog, or even software)
Unfortunately that is a lot. Getting 1200 customers to pay you any amount requires enormous amounts of marketing, whether its paid or acquiring an audience.