Architecture

Not a catalog of the Gang of Four patterns — an argument for why they’re foundational. Design patterns are a shared vocabulary that lets you read a codebase’s architectural intent from the names alone, and the value of that shared language transcends any specific programming language.

A jargon-free introduction to hexagonal architecture — the idea that your business logic should sit in the middle and the outside world (databases, screens, APIs, tests) should plug into it through simple, agreed-upon shapes. Small worked examples in Python, Go, and Rust show what changes when a new requirement arrives.