Textbook in PDF format "The Architect's Guide to NestJS" is a comprehensive resource for developers and architects looking to build scalable, maintainable distributed systems using the NestJS framework. The book explores Clean Architecture principles applied to NestJS, moving beyond basic MVC patterns to advanced concepts like domain-driven design, CQRS, and event sourcing. It provides practical guidance on structuring large-scale applications, managing distributed transactions, implementing effective data patterns, and organizing development teams. NestJS stands as a powerful, progressive framework for building efficient, scalable server-side applications. Designed with TypeScript at its core, it combines elements from object-oriented programming, functional programming, and functional reactive programming to provide a robust foundation for enterprise-level applications. What distinguishes NestJS from other Node.js frameworks is its opinionated architecture that emphasizes structure, maintainability, and testability