I want to build a tech startup but I hate to deal with side things - I will not promote

I love to solve business problems with software, design robust systems and write clean code. At work, I love to come up with nice solutions to business problems. I had in mind to start my own business but I give up every time when start thinking about what it takes beyond solving business problems with software and technologies as a whole. I am talking about marketing, research, product promotion, searching funds and etc. I started to realize that that's what companies for, everyone in the company does what it likes or can do, so everyone have their responsibilities. But, that's in large or relatively large companies when processes are pretty much settled, but how to get to that point without doing everything yourself? I think the best is to find co-founders with skills and expertise from different areas. If I had unlimited funds, I'd probably just hire people or companies to deal with things I don't like, don't want or simply can't do. Any other ideas? What's your story?