I built a rough prototype of a developer tool I planned to sell that got some interest from consulting companies. Since we weren't making enough revenue yet but

I built a rough prototype of a developer tool I planned to sell that got some interest from consulting companies. Since we weren't making enough revenue yet but I was full-time at a normal job, I figured going into contractor work would be a nice transition to going full-time on my company, plus the hourly rate was about 2x what I was doing at my full-time job. They seemed happy to have me help them out for a bit. It worked pretty well and I only had to do it for a few months, but I learned I don't really care for client work.