02 — Pattern Selection & Trade-offs

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 — 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.

01 — What Is a Pattern?

The history and vocabulary of pattern thinking — Christopher Alexander's pattern language, the Gang of Four's catalog, anti-patterns, and how a pattern differs from a one-off design decision.

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.