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01 ·Inference & Serving·★ MEMBER·PAPER·14 min read Paper Walkthrough: From Production Traffic to Post-Training — Folding 200 Internal Apps Into One Self-Hosted LLM How a company forced to self-host by data-residency rules collapsed a sprawling model fleet into one checkpoint: classify production failures by hand, train one GRPO expert per weak axis, then merge the weights with SLERP. Includes three real reward-hacking failures.