"The most painful mistake I see entrepreneurs make is launching before learning. For example, you may decide you want to launch a marketing consulting company, so you hastily make a website, content and reach out to people, but you haven’t yet figured out who your target clientele is. What people actually need help with or what you're specifically good at. So no one bites."
If you are a software developer of course the internet is your strongest marketing platform. There is a large market for software on the internet. All you need to do is to look for a task in the IT world and then build a software to help simplify the task. For example; you can develop a software that will help people manage their clientele base (CRM software), you can develop software that will help people manage their payrolls, accounts, online files et al.