Course · 6 lessons ~30 hr Intermediate

Evolutionary Architecture & Decision-Making

Evolutionary Architecture & Decision-Making covers: Building Evolutionary Architectures, Learning Systems Thinking, The Mythical Man-Month. Master the meta-skill of architecture: how to make decisions under uncertainty, how to evolve architectures over time, how to balance technical purity with business reality, and how to think in systems. Rails itself is an evolutionary architecture. From Rails 1 to Rails 8, the framework has evolved — assets pipeline to Webpacker to import maps, ERB to Hotwire, Prototype to jQuery to Turbo. Each evolution was guided by fitness functions (backward compatibility, developer happiness, convention over configuration). A long-maintained gem, with releases spanning multiple Rails and Ruby versions, is a case study in evolutionary architecture. Module 9 gives you the language to describe what you have been doing.

reading · we frame, you read MIT or the canonical taught · we author, no canonical fits ↺ spirals back to earlier lessons

Course locked

Complete Reliability, Observability & Operations first.

This course unlocks once you've finished its prerequisite. Open prerequisite →

reflection reading · 8 min

Honest Take — Before You Begin

Companion to SOFTWAREARCHITECTUREMASTERYCURRICULUM.md Honest reflections, no sugar coating.

preview →

reading · 30 min + ~300 min canonical L1

Building Evolutionary Architectures: Fitness Functions for Change

Your CI pipeline fails the build when a test breaks. What fails when the architecture breaks?

primary Martin Fowler: Is Design Dead? (2004, still relevant)

after L1 locked

reading · 30 min + ~300 min canonical L1

Learning Systems Thinking: From Lines to Loops

Think of the last fix that made things worse. The cache you added to rescue a slow query — which shipped a stale-data bug six weeks later, which got patched with invalidation call…

primary Martin Fowler: Is Design Dead? (2004, still relevant)

after L2 locked

reading · 30 min + ~300 min canonical L1

The Mythical Man-Month: Fifty Years of Being Right

This book is about an IBM mainframe operating system whose programmers submitted batch jobs and waited days for compiler time. It was published in 1975. And its second essay expla…

primary Martin Fowler: Is Design Dead? (2004, still relevant)

after L3 locked

exercise reading · 30 min L1

Module Checklist

Work through each item before the checkpoint.

after L4 locked

project reading · 150 min L1

Project: An Architecture Retrospective

Take a system you've actually lived with — a work app, a long-running side project, a library you maintain — and map how its architecture evolved. Which decisions were reversible,…

after L5 locked

6 lessons. Read in order; spiral back when you need to. By the end you'll have used the core ideas twice — once on the abstract, once on something you'll meet at work next week.