Oisin Hanrahan is a classic example of an entrepreneur seeing a problem, solving the problem and cashing in. Having trouble sourcing reliable service companies, Hanrahan and his team filled the void by creating an app for household service providers and consumers to connect. The company raised about $130 million and then agreed to be bought be a large, private U.S. company. Capital Ideas Media publisher Mark Bunting finds out how Hanrahan succeeded when so many others fail.