A curated list of awesome Elixir, Command Query Responsibility Segregation (CQRS), and event sourcing resources.

• Libraries
• Community resources
• Books
• Articles
• Presentations
• Screencasts
• Example applications

• Chronik - A lightweight event sourcing micro framework for Elixir.

• Commanded - Use Commanded to build your own Elixir applications following the CQRS/ES pattern. Provides support for command registration and dispatch, hosting and delegation to aggregate roots, event handling, and long running process managers.

  • Commanded audit middleware - Command auditing middleware for Commanded CQRS/ES applications using Ecto for persistence.

  • Commanded Ecto projections - Read model projections for Commanded using Ecto.

  • Commanded scheduler - Schedule one-off and recurring commands for Commanded CQRS/ES applications .

  • Commanded Swarm registry - Distributed process registry using Swarm for Commanded.

• Eidetic - An event sourcing library for Elixir.

• ES - Event Sourcing for Ecto and Postgresl/Dynamodb events storage.

• EventBus - Traceable, extendable and minimalist event bus implementation for Elixir with built-in event store and event watcher based on ETS.

• Eventlog - A simple event log backed by dynamodb and dynamodb streams.

• EventStore - An Elixir event store using PostgreSQL for persistence.

• Extreme - Elixir adapter for Greg Young's Event Store.

• Helios.Aggregate - Elixir library defining Aggregate behaviour and providing extendable facility for aggregate command pipeline.

• Maestro - An Elixir event store + CQRS library.

• Perhap - Purely functional event store and service framework inspired by domain driven design and reactive architectures.

• DDD/CQRS/ES Slack - A Slack team for those who want to chat about domain-driven design, CQRS, event Sourcing, and sometimes random things. Main channel is language and framework agnostic. Join ddd-cqrs-es on Slack to get an invite.

• Elixir lang Slack - This offical Elixir language Slack team includes an #eventsourcing channel for CQRS/ES and Elixir discussion. Join Elixir on Slack to get an invite.

• Building Conduit - Applying CQRS/ES to an Elixir and Phoenix web app.

• A Functional Foundation for CQRS/ES by Mathias Verraes - A CQRS architecture can be seen as a set of referentially transparent functions that model decisions and interpretation.

• Building a CQRS/ES web application in Elixir using Phoenix by Ben Smith - Case study describing how a web application was built using CQRS/ES.

• CQRS with Elixir and Phoenix by Jean-François Cloutier - Implementing the CQRS pattern in Elixir.

• DDD within Elixir/Phoenix project: Umbrella apps & Service Object by David McLeod.

• Elixir: Domain driven design with Actor Model by Naveen Negi.

• Event Sourcing in Elixir by Derek Kraan - Explore how we can use some of Elixir’s more interesting features to implement event sourcing.

• My First Event Sourced Application by Leif Gensert - Building an event sourced application using Commanded.

• Building CQRS/ES web applications in Elixir using Phoenix by Ben Smith.

• Building beautiful systems with Phoenix contexts by Andrew Hao @ ElixirDaze 2018 - Learn about Phoenix contexts from their origins in domain-driven design and how they help you to organise an Elixir application by providing rules around communication, boundary enforcement and testing. [ slides ]

• CQRS and Event Sourcing by Bernardo Amorim @ Code Beam SF 2018 - A look into what Event Sourcing and Command Query Responsibility Segregation are and how they fit together, followed by a tutorial on how to implement an application using these concepts with Commanded (a framework for Elixir).

• CQRS with Erlang by Bryan Hunter @ NDC 2014 - Dive into CQRS, and explore a sample implementation written in Erlang. [ slides | repo ]

• Event-driven architectures in Elixir by Maciej Kaszubowski @ ElixirConf EU 2018 - Learn how you can improve your architecture and reduce coupling by using events. [ slides ]

• Event Sourcing in Real World Applications Challenges, Successes and Lessons Learned by James Smith @ ElixirConf 2018 - Building a real time auction application for supplying fuel to ships using event sourcing.

• Event Sourcing with Commanded by Andriy Drozdyuk. [ slides | repo ]

• Implementing CQRS on top of OTP (in Elixir) by Hubert Łępicki. [ video ]

• Intro to Event Sourcing and CQRS in Elixir by Ben Moss.

• Perhap: Applying Domain Driven Design and Reactive Architectures to Functional Programming at ElixirConf 2017 by Rob Martin.

• Winter is coming by Luis Ferreira @ Functional Conf 2017 - Building maintainable applications by applying domain-driven design in Elixir using umbrella apps and its actor model. [ slides | video ]

• Building a single event sourced feature in Elixir using Commanded by Shawn McCool.

• Bank by Bernardo Amorim - Sample Application for Elixir Brasil Talk.

• Coins by Bernardo Amorim - An example app using CQRS and Event Sourcing built with Commanded for a talk at CodeBEAM SF 2018.

• Conduit - A blogging platform, an exemplary Medium.com clone, built as a Phoenix web application.

• DDD Shipping Example by Peter C Marks - Elixir implementation of the shipping example from Eric Evan's "Domain-driven Design: Tackling Complexity in the Heart of Software" book.

• Simple Pay by Christopher Yammine - An exploration of using CQRS/ES with Elixir & EventStore database.

To the extent possible under law, Ben Smith has waived all copyright and related or neighbouring rights to this work.