Designing a Multi‑Account Unified Login System and Optimized Authentication Flow
This article explains how to design a scalable multi‑account login architecture—including self‑built phone‑number registration, optimized password‑optional flows, third‑party integrations such as Weibo, and a unified user‑basic and user‑auth table schema—while also covering one‑click carrier‑based login and its advantages and drawbacks.