Design a multi-tenant chatbot platform where every business gets its own custom assistant.

Five thousand businesses, five thousand assistants, one platform. The hard parts are tenant isolation you can defend, noisy neighbors, onboarding a tenant with zero data, and evaluating assistants you can never manually QA. Here is the control plane and the data plane.

Updated Sep 2026 · Grounded in real GenAI, LLM, and AI/ML engineering interview loops and written to a senior-engineer editorial bar.