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If its in stealth mode and there is nothing for them to so, then I would hesitate. Are you planning on continuing with the startup after getting hired? That is the risk that they will see.

If the startup will be over by then, I would put it on the resume, but if you plan on continuing to work on it, then I would not put it on. If you plan to continue with it, you will need to be very careful with the IP ownership. If you have to sign an employee agreement, there is normally a place to list prior inventions/IP that are yours and that they can lay no claim on.