The opinionated microservices framework
for moving away from the monolith

Lagom helps you decompose your legacy monolith and build,
test, and deploy entire systems of Reactive microservices

Lagom is Approaching EOL

This project will only receive security patches until July 1, 2024, at that point the project will no longer receive any additional patches.

If you are an existing customer of Lightbend and we have not yet contacted you, please reach out to Support.

We recommend migrating any existing work to:

  • Akka for deeply customized projects with complex infrastructure needs. Akka now contains the vast majority of Lagom features.
  • Kalix for a managed scalable environment with an abstraction above the Akka framework layer to allow you to focus only on business logic.


Lagom is an open source framework for building systems of Reactive microservices in Java or Scala. Lagom builds on Akka and Play, proven technologies that are in production in some of the most demanding applications today.

Lagom's integrated development environment allows you to focus on solving business problems instead of wiring services together. A single command builds the project, starts supporting components and your microservices, as well as the Lagom infrastructure. The build hot-reloads when it detects changes to source code.

Right-sized services created with Lagom enable:

  • better defined development responsibilities—to increase agility
  • more frequent releases with less risk—to improve time to market
  • systems with reactive qualities: responsiveness, resilience, scalability, and elasticticity—to make best use of modern computing environments and meet demanding user expectations

Watch the 3-minute Meet Lagom video below, or try Lagom yourself. Create a Lagom project and test a simple Hello World service in just a few minutes.

Learn more

View introductory videos below or browse Lagom documentation.

Introduction To Lagom

With James Roper (14 Min)

Services are asynchronous. Intra-service communication is managed for you. Streaming is out of the box. Your microservices are resilient by nature.

Developer Setup

With Mirco Dotta (11 Min)

Development is familiar. Use your favorite IDE and favorite dependency injection tools. You leverage the old to build something new.

Managing Data Persistence

With Patrik Nordwall (16 Min)

Systems are distributed. Akka Cluster and Akka Persistence are under the hood. Cluster sharding is implicit. CQRS and event sourcing is made trivially easy. Your systems are cloud ready and elastic.