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Autonomous Domain Capabilities
Building Maintainable Software Beyond Shared Domain Models
Much of business software is organized around a shared central model that many different responsibilities depend on. Autonomous Domain Capabilities make the capability the primary unit, with each capability defining the data structures and decisions required for its responsibility.
Build systems that scale with your team and AI coding tools. Learn Autonomous Domain Capabilities as a modern, event-sourced approach that moves beyond horizontal layered designs and typical Domain-Driven Design approaches like Clean Architecture.
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About
About the Book
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.
Author
About the Author
Rico Fritzsche
After decades of applying enterprise architecture patterns such as layered architectures and Domain-Driven Design in real-world projects, Rico Fritzsche developed Autonomous Domain Capabilities as a cleaner, more practical way to build systems. He is an independent software architect, open-source contributor, and writer who believes that good architecture should enable teams rather than slow them down.
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