Sounds like you enjoy building software, I wouldn't take up your dad's business. It also seems like your hometown doesn't have many great companies to join, I w

Sounds like you enjoy building software, I wouldn't take up your dad's business. It also seems like your hometown doesn't have many great companies to join, I would move to a location brimming with opportunity like San Francisco. Finally, your technical interview algorithm/problem solving probably needs work, I would either study for a month+ and improve this area (a good resource would be Cracking the Code Interview), or join a startup instead. I personally think you'd get a lot out of a startup, you'll learn about what it takes to run a business and have a lot of ownership in what you build.