How I built a provider-agnostic AI architecture that automatically switches between Groq, OpenRouter, Ollama, and Gemini.

Short summary

A practical architecture guide for building a provider-agnostic LLM router using LangChain and FastAPI that automatically switches between Groq, OpenRouter, Ollama, and Gemini. The router sits between application services and LLM providers, handling health checks and failover cascades while exposing a uniform interface. Adding new providers requires only implementing a base class with a get_llm method.

• •Single router layer decouples business logic from specific LLM providers
• •Automatic failover cascade: Groq → OpenRouter → Ollama based on health checks
• •New providers added by implementing a simple BaseLLMProvider interface

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