Frontend (Next.js / React)
↓
API Layer (Node.js / Route Handlers)
↓
LLM Orchestration Layer
(OpenAI / Claude / Ollama / LangChain)
↓
Vector DB / Retrieval Layer
(Pinecone / Chroma / Supabase)
↓
Documents / Databases / APIs
Modern AI applications are evolving into layered intelligent systems rather than traditional frontend/backend setups.
The frontend delivers AI-native user experiences, including chat, streaming responses, dashboards, and conversational workflows. The API layer serves as the secure backend gateway, handling authentication, requests, rate limiting, and communication with AI services.
The LLM orchestration layer now functions as the “brain” of the application, coordinating prompts, memory, tool calling, agents, and reasoning workflows using models like GPT, Claude, or local open-source models.
Below that, the vector database layer supports Retrieval-Augmented Generation (RAG), enabling applications to search documents semantically through embeddings rather than keywords. This provides AI systems with long-term contextual memory, significantly boosting accuracy.
At the base are the primary sources of organizational knowledge: PDFs, SQL databases, APIs, cloud storage, enterprise systems, and external data feeds. Increasingly, modern software engineering involves connecting users to intelligent reasoning systems layered over live organizational data.