In this "Lessons learned" interview, uTest founder and CEO Doron Reuveni, talks about how the company changed business models since its launch in 2007. Boston-based uTest has about 50,000 engineers conducting crowd-sourced testing for companies. When the company first started, the payment model was a pay-per-bug model, said Reuveni. The market rejected the model. And, the company soon embraced a project-based as well as subscription model. The model changed the way the company interacted with customers and compensated testers.