Hi All

I'm currently looking at an offer for a position where I'd be brought in to be the sole expert and employee developing a product. They have a shakey prototype and they would be fully relying on me to get it up to industry standards. It's also the first line of product that would allow many other products to follow and allow them to gain a footing in the market and expand. They are desperate and they would be relying heavily on me for their future.

My question is, would it reasonable to ask for a percentage of the profit from the product in my initial contract?

My idea was to ask for 2%, and only have it start once we actually get the product to a certain industry benchmark (80% efficiency in this case). It would give me a huge incentive and motivation to take ownership of the product. They are looking for someone to take full ownership of it.

I appreciate any insight and any kind of changes you would do so I can get this right.