04 — Integration Patterns

Patterns

A book-shaped table of contents for reusable engineering patterns spanning object-oriented design, enterprise architecture, distributed systems, messaging, APIs, cloud infrastructure, observability, security, concurrency, AI/agentic systems, and organizational design — grounded in production experience at scale.

03 — Transaction Patterns

Unit of Work, Identity Map, Lazy Loading, and Optimistic vs. Pessimistic Locking — the patterns that keep an object graph and its persisted state from drifting apart.

02 — Domain Modeling Patterns

DDD's tactical toolkit: Rich Domain Model vs. Anemic Model, Aggregate, Entity, Value Object, Repository, Factory, and Specification — the vocabulary a domain model needs to stay consistent under concurrent writes.

01 — Layering Patterns

Layered Architecture, Hexagonal (Ports & Adapters), Onion, Clean Architecture, and Screaming Architecture — how each draws the boundary between domain logic and infrastructure, and what that boundary costs.

Patterns

A book-shaped table of contents for reusable engineering patterns spanning object-oriented design, enterprise architecture, distributed systems, messaging, APIs, cloud infrastructure, observability, security, concurrency, AI/agentic systems, and organizational design — grounded in production experience at scale.