Serving Customer Data with Azure Cosmos DB
summary
Grab uses Azure API Management + Azure Functions with Cosmos DB (SQL API) as the backend for its Customer‑360 API that serves thousands of attributes across millions of users. Daily traffic reaches ~50 million calls, point reads average under 5 ms (P95 ≈ 5.5 ms) and API round trips average ~50 ms, letting fraud models run within a 500 ms target. Ingestion uses Databricks pipelines and an explicit rotating container strategy to prevent writes from blocking reads; production handles a few thousand RPS today.
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