If you really know your stuff, enough to build good apps and a successful business, then it's possible that a smart enough co-worker (manager or not) will notice a gap between that potential, and your output. So "can I get away" seems to me equivalent to, "will they notice, and if so, does it matter to them?"<p>The answers to those questions will vary over time as your employer's business itself changes. Your worst case scenario is "Yes/Yes," ofc, and best-case is "No/Irrelevant." Reality is probably somewhere in the middle. I have seen cases where someone like you got "noticed," because a peer who didn't care about a side business out-competed them at work performance. No one was malicious in this equation; once "Mary" got going with her natural enthusiasm, it just became obvious that "Joe" was being paid too much. "Joe" got a bit of talking-to; he decided to quit.<p>If your W-2 income is critical to you, for whatever reason, you want to keep an eye on this whole situation. If the energy spent in keeping an eye on that drains you from pursuing your business goals, then it's not worth it to you to get away with it, even if you do.<p>If you are weighing moral qualms, don't fall into the trap of over simplifying it in either direction. No, you probably don't work for a "soulless" corporation that doesn't care about your creativity and thinks you are dispensable yada yada; but no, you didnt sign some sort of pledge of absolute allegiance either when you joined (but yeah, you did sign something that would give your employer property rights to your business, under certain circs, and it's again not a given whether they'll exercise this right if they can.)<p>Short version: it depends :)