How do you design system prompts and prompt templates for production?
The difference between a demo prompt and a production prompt is structure, versioning, and defense. The signal is treating the system prompt as a contract and templates as parameterized, testable artifacts. Here is the answer.
Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.
The difference between a demo prompt and a production prompt is structure, versioning, and defense. The signal is treating the system prompt as a contract and templates as parameterized, testable artifacts. Here is the answer.
Lead with where the obvious approach breaks, because that is the judgment they are screening for — most candidates jump straight to the happy path and lose the room.
Then walk the failure back through the pipeline in order, naming the one metric the customer's exec sponsor actually cares about before you propose the fix.