Quitting my job at an enterprise software company. I worked for a series of companies that wrote software that they didn't actually use (or at least their operations didn't depend on using it). Not eating their own dog food meant they could get away with selling software that didn't work very well. It was demoralizing to be told we had to prioritize making new things over fixing what we had.

Now I only work for companies that use their software to provide a service. There is more of an incentive for the software to actually work.