This technical volume targets developers who want to extend ComfyUI or embed it into complex systems. It covers the architecture of ComfyUI, creating and debugging custom Python nodes, building node libraries, performance optimization, headless execution, and integrating third-party models and accelerators. Readers will walk through real-world projects: building custom nodes for novel preprocessing, integrating ControlNet/Adapters safely, and deploying ComfyUI into CI/CD pipelines. The book is a practical developer’s handbook with code samples, design patterns, and best practices for long-term, production-grade integrations.