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Traditional layered architectures, Clean Architecture, and even common Domain-Driven Design are increasingly showing their age in 2026. As teams adopt AI coding agents, work with distributed ownership, and face ever-growing complexity, many discover that shared models, heavy coordination, and rigid boundaries create more problems than they solve.

This book presents Autonomous Domain Capabilities as a practical, opinionated alternative focused on true autonomy, facts-first thinking, and minimal coupling.

You will learn how to build systems using:

Request Processing Units (RPUs): autonomous, narrowly-scoped units that own both behavior and relevant facts
Functional Core / Imperative Shell pattern for maximum testability and clarity
Command Context Consistency: a powerful technique that guarantees decisions are made only on consistent facts (without traditional event streams or aggregates)
Reactors for safe coordination without polluting domain logic
A lean, payload-based Event Sourcing approach powered by facts instead of per-entity streams

Whether you are a senior engineer, software architect, or tech lead frustrated with maintainability issues in large codebases, this book gives you concrete patterns, real code examples (in TypeScript, C# and Rust), decision records, templates, and migration strategies you can apply immediately.

By the end, you’ll have a clear strategy for building systems that are:

Easier to evolve and test
Better aligned with team ownership
More resilient in the age of AI-assisted development

This is not another generic architecture book. It is a focused, battle-tested approach developed from real-world projects, designed for developers who want maintainable systems without the usual ceremony and coupling.

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Kick off your book project, get started with GhostAI, get better at marketing, or spend the day doing all three! Free live workshops on Zoom. Saturday, June 27, 2026.

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