Building Conduit

Building Conduit is a practical ebook for Elixir developers who want to see CQRS and event sourcing applied in a real Phoenix application, not just discussed in abstract terms. Using a -style Conduit clone as the running example, it follows the process of designing, testing, and building a working web app from the ground up.

A hands-on CQRS/ES guide for Elixir

The book focuses on the core moving parts of a CQRS/ES system: commands, domain events, read models, projections, and the separation between writes and queries. Rather than treating those ideas as theory, it shows how they fit into an Elixir codebase and how they shape the overall structure of the application.

Built around a realistic Phoenix project

Conduit is presented as a real-world blogging platform with features such as user registration, article publishing, favorites, tags, comments, and authentication via JSON Web Tokens. The project is developed as a Phoenix web app, with testing used throughout to keep the implementation grounded and verifiable.

What the book emphasizes

• Test-driven development for HTTP APIs
• Command validation and domain modeling
• Event-sourced aggregates and projections
• Read/write model separation
• Practical authentication and article workflows

Who will get the most from it

This title is best suited to readers who already understand the basics of CQRS/ES and are comfortable with Elixir syntax and concurrency concepts. If you want a concrete walkthrough of how these patterns look inside a Phoenix application, this book offers a focused, implementation-first path.

Why it stands out

Because the entire book is organized around a single working application, the material stays connected to actual design decisions instead of drifting into theory. That makes it especially useful for developers who learn best by following a system feature by feature, test by test. 💡