Thanks all for the tips; I've worked on my own company before, and this startup has a security guy. It seems sufficient enough.

Hi,
I've been offered an opportunity to work at a cryptocurrency exchange startup as a software engineer. I'm interested in the technologies involved, though not Java which they want me to use. What's it like to work on these things?

Also, do you think the current competitiveness of cryptoexchanges is a winner-take-all thing? Seems like there's an abundance of them.