I am a finance guy running a B2B product startup called www.ifanow.com. I learnt the following after starting up.
Our new product roadmap is primarily driven by me. At the feature design stage itself, I decide the initial db structure, create HTML pages etc. This takes off the load from the backend and frontend team. Working for us pretty well.
In a tech startup you need good developers. But you also need to have someone who understands ALL these facets very well - Design/Domain/Product/Tech.