If you want to become a crypto-currency software developer you need a lot of knowledge in software development. Like other jobs, you need to be professional and skilled in your field. It's base on knowledge because how can you do well in software development if your knowledge is not enough.
agree with this, me are software developer build website to be more specific. but personally i know nothing about crpyto code hahah
and anyway if u interesting to know about it there's a lot coin out there that open source. usually coin using python language and C maybe u can start learning that language first