[donutdan4114]

I built an app plugin for Shopify called Custom Fields https://customfields.bonify.io

I must say, if you want to build something that instantly has a market consider building plugins for existing 3rd party systems that allow you to charge a fee. It ends up being a much smaller project than trying to build your own, huge web app, and it comes with a targeted, focused audience who can easily install your app with a couple clicks (and get charged). You don't really have to market anything.

Build something good and people will find it.

[k__]

Yes, sounds reasonable.

I know a few companies and people who make good money with shopify-, wordpress- or atlassian-plugins.

There should be a directory for such systems with market places.

[coreymaass]

I started looking for opportunities in WordPress a couple years ago. Anytime I found a new app, I got in the habit of checking if it existed as a WordPress plugin. I've since built a nice side business that I hope to grow into a day job.