01 — What Is a Pattern?

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.

02 — Pattern Selection & Trade-offs

How to choose between competing patterns under real forces: naming the context, weighing trade-offs and consequences, composing multiple patterns together, and recognizing when a pattern has outlived its fit.

03 — SOLID Revisited — Principal-Level Framing

SRP, OCP, LSP, ISP, and DIP reframed at architecture scale — stable dependencies and stable abstractions as the load-bearing idea, not the five-bullet mnemonic.

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.