Jonathan Stark says the key to side hustle success -- for consultants, at least -- lies in finding an expensive problem, and solving it.

Jonathan's a pro at finding these expensive problems, having run a successful online consulting business for several years, focusing on mobile-ready web development.

At the recommendation of two-time Side Hustle Show guest, Kai Davis, he dropped by to share some of his insight on how to get a side hustle consulting business off the ground.