Backend Developer for AI Chatbot / RAG Fixes

Need a backend developer with AI chatbot / RAG experience to fix out-of-context responses in an existing chatbot.Our backend tech stack is based on node js . The bot already works with files, database, and website content, but we need better handling when no relevant context is found. The goal is to prevent irrelevant answers and improve response reliability. Please share relevant chatbot/RAG backend experience.