Senior Full-Stack Developer RAG, AI, React, Next.js, Node.js, OpenAI

We are looking for an experienced Full-Stack Developer to integrate a production-ready AI chatbot into our existing React/Next.js application. The chatbot should provide intelligent, human-like conversations, maintain conversation context, leverage our business knowledge base, and integrate seamlessly with our existing backend systems. This is a production-level AI integration project requiring strong experience with LLMs, Retrieval-Augmented Generation (RAG), vector databases, AI agents, and modern web development. Responsibilities - Integrate an AI chatbot into our existing React/Next.js application. - Connect the chatbot with OpenAI API, Claude API, Gemini API, or other suitable LLM providers. - Build conversation memory and context management. - Implement RAG using our internal knowledge base. - Integrate a vector database (Pinecone, Qdrant, Weaviate, Chroma, or pgvector). - Develop a modern, responsive chat interface. - Connect the chatbot with existing REST APIs, backend services, and databases. - Implement secure authentication so the chatbot recognizes logged-in users. - Optimize latency, token usage, streaming responses, and overall AI performance. - Secure API keys, user data, and AI requests following industry best practices. - Deploy the solution to our production environment. Required Skills - AI Chatbot Development - OpenAI API or other LLM APIs - React.js - Next.js - Node.js - Express.js - TypeScript / JavaScript - REST API Integration - WebSockets - MongoDB / PostgreSQL / MySQL - Prompt Engineering Nice to Have - Retrieval-Augmented Generation (RAG) - LangChain - LangGraph - LlamaIndex - AI Agents - MCP (Model Context Protocol) - Pinecone - Qdrant - Weaviate - ChromaDB - pgvector - Supabase - Redis - Vercel AI SDK - Streaming AI Responses - Semantic Search - Embeddings - Function Calling - Tool Calling - Knowledge Base Chatbots - Multi-Agent Systems - Production AI Applications Preferred Experience Candidates who have built production AI applications such as: - AI Customer Support Chatbots - AI Sales Assistants - Knowledge Base Chatbots - Internal Company AI Assistants - RAG Applications - AI Agents - Chatbot Integrations - AI Workflow Automation - Enterprise AI Applications To Apply Please include: 1. Links to AI chatbot or AI agent projects you have built. 2. Which LLM(s) you recommend (OpenAI, Claude, Gemini, or others) and why. 3. A brief summary of your approach to building a scalable production AI chatbot. Only applicants with relevant AI chatbot, LLM, RAG, or AI application experience and portfolio examples will be considered.