Um, sorry but you cannot write good software unless you're passionate about it. Money alone will not fuel the all night motivation and constant self learning that is required in the field. Even in mundane business apps the small things can give you satisfaction such as a good algorithm, responsive UI, or just elegant/maintainable code. Every good developer I know have massive passion and usually work on their own projects outside of work (but never have time for them). You'll need a lot of passion to pull off a good app, or maybe I misread you're intentions and you're trying to find a project to get excited about?
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