How do you design system prompts and prompt templates for production?
What separates a demo prompt from a production prompt is structure, versioning, and defense. What matters is treating the system prompt as a contract and templates as parameterized, testable artifacts. Here is the answer.
Updated Sep 2026 · Grounded in real GenAI, LLM, and AI/ML engineering interview loops and written to a senior-engineer editorial bar.
What separates a demo prompt from a production prompt is structure, versioning, and defense. What matters 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.