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Event-Driven Architecture & DDD in TypeScript. Event Sourcing, CQRS, and Microservices at Scale
About
About the Book
Master Enterprise-Grade Event-Driven Architecture, DDD, CQRS, and Event Sourcing in TypeScript & Node.js!
When enterprise systems fail under heavy load, the root cause is rarely technical incompetence—it is a semantic mismatch between complex business rules and fragile, monolithic CRUD database designs. In Volume 28 of the Series, author Edgar Milvus delivers a definitive, production-ready masterclass on designing, building, and scaling event-driven microservices using TypeScript.
Learn how to abandon destructive database updates in favor of Immutable Event Streams, protecting business invariants at compile-time and runtime while scaling read and write workloads independently.
What’s Inside This Comprehensive Guide:
- Strategic & Tactical Domain-Driven Design (DDD): Enforce Bounded Contexts, design rich Aggregates, build immutable Value Objects with branded types, and eliminate primitive obsession.
- Append-Only Event Sourcing Core: Build an Event Store from scratch, enforce Optimistic Concurrency Control (OCC), and optimize aggregate hydration using Redis L1/L2 Snapshots.
- CQRS & Asynchronous Projections: Sever reads from writes. Construct idempotent PostgreSQL read models tailored for sub-millisecond API and UI queries.
- The Transactional Outbox Pattern: Eliminate the dual-write problem using PostgreSQL
SKIP LOCKEDpolling, Change Data Capture (CDC / Debezium), and atomic transactions. - Event Broker Mastery: Deep-dive architectural comparisons and code implementations for Apache Kafka, RabbitMQ, and NATS JetStream in Node.js.
- Distributed Sagas & Error Recovery: Orchestrate long-running transactions with state machines, compensating rollbacks, Dead-Letter Queues (DLQ), and Circuit Breakers.
- Schema Evolution & Upcasting: Evolve event schemas across years of operation without breaking historical replay or current domain models.
- Distributed Tracing with OpenTelemetry: Propagate W3C Trace Contexts across asynchronous broker boundaries, correlate logs, and eliminate distributed debugging blind spots.
Packed with theoretical rigor, modern analogies (React Server Components, Virtual DOM, ESM), common pitfalls, and full-stack code examples using Zod, Prisma, OpenTelemetry, and React/TSX, this book is your ultimate blueprint for building enterprise microservices that scale effortlessly.
Take your TypeScript backend architecture to the enterprise level !
Table of contents
Chapter 1: Ubiquitous Language & Bounded Contexts in TypeScript
Chapter 2: Value Objects and Entities - Immutability & Validation
Chapter 3: Aggregates & Domain Boundaries - Protecting Business Invariants
Chapter 4: Modeling Domain Events with TypeScript Discriminated Unions
Chapter 5: Domain Repositories & In-Memory Implementations for Testing
Chapter 6: Decoupling Reads and Writes - Intro to CQRS in TypeScript
Chapter 7: The Write Model - Command Handlers & State Transitions
Chapter 8: Event Sourcing Core - Building an Append-Only Event Store
Chapter 9: The Read Model - Building Event-Driven Projections with PostgreSQL
Chapter 10: Performance & Snapshots in Event-Sourced Systems
Chapter 11: Choosing Event Brokers - Kafka vs RabbitMQ vs NATS in Node.js
Chapter 12: Reliable Event Publishing with the Transactional Outbox Pattern
Chapter 13: Idempotent Event Handlers & At-Least-Once Delivery Guarantees
Chapter 14: Event Schema Evolution and Versioning Strategies
Chapter 15: Dead-Letter Queues & Error Recovery Workflows
Chapter 16: Orchestrating Long-Running Transactions - The Saga Pattern
Chapter 17: Distributed Tracing & Observability for Event Streams with OpenTelemetry
Chapter 18: Testing DDD & Event-Sourced Applications (Unit & Integration)
Chapter 19: Security, Authorization & Tenant Isolation in Distributed Events
Chapter 20: Capstone - Building an Enterprise-Grade E-Commerce & Order Management Core
If printed, this ebook would span over 400 pages. Each chapter is structured into theoretical foundations, an annotated basic example, an annotated advanced example, and five coding exercises based on real-world scenarios with complete solutions.
Author
About the Author
Edgar Milvus
A veteran software engineer with 20 years of experience, I have dedicated my career to the art of automation. My philosophy is simple: programming should eliminate repetitive chores to unlock human creativity. This journey began early on with the development of custom code-generation tools and has evolved into a deep mastery of LLMs and their APIs. Today, I specialize in architecting AI-driven solutions that handle everything from complex coding and security tasks to advanced knowledge retrieval, transforming the way we interact with technology
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