What is your goal in getting credit? The CEO doesn't give a flying fuck who wrote the code. If your goal is to get promoted into a managerial role or some addit

What is your goal in getting credit? The CEO doesn't give a flying fuck who wrote the code. If your goal is to get promoted into a managerial role or some additional compensation then talk to your boss directly about it, say you want some tangible and intangible recognition of your successful work on this. If you have no such goal then stop worrying about what the CEO thinks of you because he'll forget your name 3 seconds after he learns it.