AI Agent Developer for RAG Assistant in B2B SaaS (LangChain, LangGraph)

We're a B2B SaaS company adding an AI assistant to our product. What we need: - An AI agent that answers user questions using RAG over our documentation, help center and product data - Orchestration with LangChain or LangGraph (multi-step tool calling) - Integration with our existing Next.js/Node.js app and PostgreSQL - Vector database setup (Pinecone or pgvector) - OpenAI or Anthropic Claude under the hood Deliverables: production-ready assistant embedded in our app, admin panel for content updates, and basic analytics on answer quality. To apply, briefly describe a similar RAG or AI agent project you shipped and which stack you used. Timeline: 4-8 weeks. We have designs and API docs ready.