pricklypear

How long have you been doing this for? Do you think this can be maintained over a long period of time?

In my experience, big companies have restrictions around moonlighting when your startup directly competes with their services/products, and assert ownership over things you work on using the company's resources, ie company computers/internet/time. So if your startup is not directly competing, and you're doing it on your own time/computer/internet, you should be good.