This system design project is a highly available and fault tolerant enterprise chatbot system that seamlessly integrates multiple communication channels and maintains robust security and scalability. The deeply interconnected architecture incorporates a modular design with distinct layers for communication, intelligence, data management, and model maintenance. It is a self-improving system; the data annotation and review services allow the chatbot to constantly learn and adapt based on real-world usage, closing the feedback loop and enhancing performance over time. This design delivers a secure, reliable chatbot solution that meets the demanding uptime and growth requirements of modern business operations.