I can't quite tell if you need a job :) if yes, quant trading is certainly an option. If you want to do something else for any reason, I can't see how this will be very different. A SE job interview will revolve around technical questions. Startups will probably focus more on skills and less on past job titles.
And if you don't need one... sounds like you first have to figure out what you want to do :)
And if you don't need one... sounds like you first have to figure out what you want to do :)
Good luck!