“Closest FC ≠ fastest or cheapest.” This talk walks through a production-grade optimization that selects fulfillment centers by true speed and true cost—combining labor models, carrier rate cards, and SLA penalties with solver-backed routing. We’ll cover inputs (zones, weights, surcharges), constraints (eligibility, capacity), experimentation (backtests + traffic splits), and rollout guardrails. Expect real-world pitfalls, what moved the needle, and how we measured success.