How our team won START Hack 2026 by building AuditChain, an autonomous procurement decision engine that keeps the LLM on parsing and explanation duty while the actual decision path stays deterministic, auditable, and boring in exactly the right places.
The post covers the real architecture from the hackathon solution: FastAPI, React, Metaflow observability, Azure-facing deployment proxies, fuzzy handling of borderline procurement cases, and why this problem is much more about decision discipline than flashy AI demos.
Also included: the prize-stage photos, the officially nonchalant photo, and a defense of fuzzy logic that survived both a hackathon jury and my own skepticism.