Capstone System Design: Define Your AI-Native Backend Service

A crisp design document with measurable success criteria, explicit trade-offs, and a working implementation plan is the artifact that distinguishes a Senior/Staff AI engineer from a developer who "tried some LLM stuff." This week builds that artifact. This matters because backend teams own the production blast radius: p95 latency, tenant isolation, cost runaway, traceability, and incident rollback after the demo is gone.

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