What to do in an equity disagreement in a startup
utsmokingaces: Ask for 20% or even more. Ownership is not everything it is the ONLY thing! If you are the sole developer, a indispensable part of the startup, you should be able to get you fair share. Stop all work until you do.Starting work before the official incorporation can be a good thing if you can show that you are a damn good developer.
Having a mba degree and being knowledgeable in "entrepreneurship" and "technology" doesn't mean shit in this arena.