Ask HN: Receive compensation for initial development effort for my start up?

My start up has three founders - me and two business guys. I will be developing the website and they will provide the business expertise and cover expenses while we are still pre-revenue. We will split the company three ways. The dilemma I'm having is the website I'm developing will become quite complex when it's finished and it seems like I should receive some upfront (or as we go) compensation for the website. Has anyone encountered a scenario like this before and as a developer how were you compensated for the initial development?