I've recently partnered with a software developer who has 5+ yrs of coding at a fortune 100 company.  I am the business "guy" and provided clear details on expectations, but after 4 months, he has nothing to show.  I'm at a crossroads of whether to start looking elsewhere or trying to motivate him.  I felt like I've given him every opportunity to be successful and put his own spin on the software, but he continues to miss deadlines.  We have a final prototype due to our first (non-paying) client in January, and he doesn't believe it's worthwhile to put in the work for something that he deems useless.  Any advice on how to handle this? Thanks

Kevin