If you've built a normal full-stack application, you probably know this architecture: React → Express → MongoDB Now let's add an AI-powered RAG pipeline. Our architecture becomes: React ↓ Express API ↓ RAG Service ↓ Embedding Model ↓ MongoDB Vector Search ↓ Relevant Context ↓ LLM ↓ Response Let's break it down. What Are We Building? Imagine a developer documentation assistant. Users upload technical documentation, and lat...