Why three food‑delivery giants built radically different LLM‑driven search
DoorDash, Instacart, and Uber Eats each rewrote their search stacks around LLMs, but chose wildly different architectures. The post shows how each company’s existing infrastructure dictated whether the LLM sits shallowly as a re‑ranker or deeply as a full‑text engine, offering a template for any AI‑powered product.