Do not share your ideas unless you own a significant portion of the startup and believe the idea would help toward the primary offering you are working toward.

Do not share your ideas unless you own a significant portion of the startup and believe the idea would help toward the primary offering you are working toward. If you are hired help with 1-2% stake in the venture, keep your ideas to yourself. Option 1 is the least likely to burn a bridge over an idea that may not work out. Option 1 also offers the most retention of your IP and highest likelihood you will profit from your idea and execution. Make sure not to work on your idea on their time or equipment.