Stored intelligence. When you program you're saving (a tiny part of ) your intelligence onto a computer which will act in your absence.

Hide it in plain sight. This is applicable for websites that have some kind of user login. Like WordPress does, grant each user a role. Normal users don't get admin privileges hence don't see the admin options.

If it involves a technical interview, rest assured that it won't be anything cryptic. Analyse the question thoroughly, plot a mental workflow about the inputs and expected outputs. If you think of an answer that makes sense say it out loud, no matter how ridiculous it may sound. The interviewer will almost always appreciate it when you demonstrate your thought process - speak all your thoughts out. He/she might in turn correct or guide you if you're drifting away. The simpler you make your solution, the easier your interview will proceed.