The Outdated Sale

Because the books are still frozen in time (yep, still on Rails 5), they’re 20% off for now! We’re actively upgrading everything to Rails 6, 7, and 8 (complete with upgrade guides), so this discount won’t stick around long. Grab it while the books are still catching up!

Modular Rails

Divide and conquer your Ruby on Rails applications.

Get a complete course on using Rails engines to build modular, maintainable systems. Reorganize your apps into focused modules, ship updates faster, and keep teams aligned.

Modular Architecture

Reusable Building Blocks

Confident Scaling

"Awesome book! This book is great and easily understandable even for beginners. I'd recommend it to any developer who wishes to learn the concept of modularity."

— Médéric Petit

Médéric Petit

Current Edition: v1.1.2

Ruby 2.2.2
Rails 5.0
Modular Rails cover
5.0
Average rating of 5.0 out of 5 stars(4)

Includes lifetime updates so your modular architecture practices evolve with Rails.

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Master the modular mindset

A hands-on Rails course that takes you from fundamentals to a production-ready modular architecture with engines, shared conventions, and deployable workflows.

Practice over theory

Learn to assemble

Module 1

Foundations of modular Rails architecture

Learn the principles behind modular applications, set the right boundaries, and adopt architecture patterns that keep Rails productive while staying organized.

Module 2

Build SamuraiCRM with engines

Follow a detailed walkthrough to build a modular CRM composed of Core, Contacts, and Tasks engines, then connect them without sacrificing isolation.

Along the way you will:

  • Define engines with clear interfaces and shared conventions
  • Wire modules together using service objects and events
  • Refine your workflow with reusable scaffolds and generators

Module 3

Operate and scale your modules

Adopt workflows for testing, releasing, and distributing modules across teams, including setting up a private gem server and long-term maintenance strategies.

Loved by developers around the world

Real stories from engineers who transformed their Rails apps.

5 out of 5 stars

Awesome book! This book is great and easily understandable even for beginners. I'd recommend it to any developer who wishes to learn the concept of modularity.

Médéric Petit

Médéric Petit

Software Engineer at SmartSoftAsia

5 out of 5 stars

I got modular Rails because I was interested in moving from a monolithic app and interested in advancing my knowledge of intermediate to advanced Rails. As a guy who teaches at a bootcamp, there comes a time when you want students to move from the usual CRUD nonsense and on to proper software architectural patterns even in the context of a framework. I shared the table of contents with a colleague of mine from the US and he too agreed that this book was the deal. Can't wait to get more from the author.

Alvin

5 out of 5 stars

I was looking for tips and shortcuts to organize my next Rails app into modules. I have no regrets. Modular Rails is a great guide that leverage the power of Rails engines and other special tips that would have taken me months (or years!) to discover and implement by myself.

Emak

5 out of 5 stars

Imagine a Ruby on Rails application composed of several modules you can plug in or out according to your needs the same way Wordpress can do with plugins. This book will teach you exactly that. Great book to have in your collection!

Panitan Patrayunyong

Software Engineer

100% money-back guarantee

Try the course for 30 days. If it doesn't elevate your Rails apps, email tibo@devmystify.com and get a full refund, no questions asked.

With lifetime updates and our zero-risk refund policy, what do you have to lose?

Guarantee

30-day full refund policy

No hoops. Just send a message if it isn't a fit.

Get 1 chapter for FREE!

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Frequently asked questions

Still unsure? Here are the answers to the most common questions.

What formats are available?

The book ships as a local HTML site plus PDF, EPUB, and MOBI editions so you can learn on any device.

Can I read a sample?

Yes! Grab a free sample to explore the writing style and the modular workflow before diving into the full course.

What if I don't like it?

You're covered by a 30-day money-back guarantee. Simply email tibo@devmystify.com and you'll receive a full refund.

Why did I create this course?

Hi, I'm Tibo. 👋

After years of helping teams refactor large Rails apps, I saw the same problems repeat: tangled dependencies, unclear ownership, and fragile deployments.

Modular Rails distills the workflows I rely on to deliver maintainable codebases while keeping the productivity that makes Rails special.

My goal is to help you adopt modular patterns with confidence so your applications stay fast-moving, even as your team and product grow.

Tibo, founder of Devmystify

Ready to build modular Rails apps?

Join developers who reorganized their monoliths, improved team velocity, and shipped features with confidence.