Are there any people out there that have recently worked on a revenue share basis and found success? Specifically, any engineers that are finding success by working with other startups, for a percentage of revenue off of the product.

Usually, you come across people that want a product/site made and then the hacker would earn money from the revenues. However, are there any engineers out there that have done work, on a revenue share basis, with a company and product/service that was already generating revenue and felt secure enough to take on the project for revenue share. Or, engineers that have done revenue share and then subsequently joined the startup/company after working with them temporarily.

Disclosure: I work with a startup company that has a live product, couple thousand customers, and generating revenue.