Unless you are paying market rates you are asking a developer to be an investor in your startup and you should treat them as such with a full pitch including th

Unless you are paying market rates you are asking a developer to be an investor in your startup and you should treat them as such with a full pitch including the likely returns, risks and proper business plan. Also a CFO wouldn't be in the top 5 priority roles for most start ups what are you going to bring in the early stages? Sales, marketing, contacts, domain knowledge, significant cash? There may be other things you can bring but you should have an answer.