Co‑locate models near data and caches to shave milliseconds. Prefer stateless microservices with warm pools, vector indexes for retrieval, and GPU admission control where necessary. Design circuit breakers and fallback scorers when dependencies fail. For payment authorization and content slots, precompute candidates, then re‑rank online, balancing relevance, risk, and cost under strict p99 latency budgets.
Run experiments safely with eligibility rules, exclusion lists, and QA sandboxes. Use interleaving to compare rankers efficiently, and multi‑armed bandits when the opportunity cost is high or drift looms. Publish experiment preregistrations, analyze heterogeneous effects, and stop early with sequential methods, protecting customers and revenue while accelerating learning across editorial, growth, and risk operations.
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