Your question is Node.js LLM Microservice Design. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Design a Node.js microservice architecture that handles rate limiting, fallbacks, and error handling when interacting with multiple external LLM APIs such as OpenAI, Anthropic, and Azure AI.