Sealed Monad: Linear Business Flows as Algebraic Data Types

Ditch nested Scala flatMaps. Learn how ADTs and the Sealed monad library compose multi-step business logic into clean, type-safe, linear flows.
Iterators (@iteratorshq)

JDK 27 is here

What shipped on September 15, and why JEP 528 was already off the train when I told you it was on.
Artur Skowronski

Reforesting the sbt plugin ecosystem and sbt 2.1.0 beta

Since the ecosystem is an essential element of the user experience, the health of the plugin ecosystem is always our concern. This is especially so when we release a new major version, which burns the old forest. All plugins need to be cross built, and re-published, like new saplings springing from the ash. There are several strategies we adopted to aid the reforestation.
Eugene Yokota (@eed3si9n)

Gradle for Scala monorepo. Box experience with 360+ modules

How Box migrated its 360+ module Scala monorepo from sbt to Gradle, and the trade-offs that followed.
Artsiom Samasadau

VirtusLab Scala Stack (VSS)

Our open-source stack that builds on solid foundations provided by Scala 3 with its advanced type system, and Java's Virtual Threads, which bring the performance of reactive programming while retaining a familiar programming model. Use the libraries together or each one separately, whatever is the best fit for your project.
VirtusLab (@VirtusLab)

tulip

Explains GitHub PRs in a human-friendly way, using LLMs.
VirtusLab (@VirtusLab)

Besom 0.5.2

Support for sbt 2.x, automation API improvements, and a lot more!
VirtusLab (@VirtusLab)

nguyenyou/scalex

Scala code intelligence for coding agents. Zero Build Server. Zero Compilation. Just answers.
Tu Nguyen

sealed-monad

sealed-monad is EitherT with readable method names and automatic error type mapping. Multi-step business logic (find user, check active, verify credentials, issue token) writes as a straight for-comprehension where each step states its failure inline, no nesting required. Works over any Monad (Future, IO, Task), no runtime dependency on ZIO. Sealed trait result types give you exhaustive compile-time error handling. Scala 2.13 and 3, Apache 2.0.
Iterators (@iteratorshq)

sbt 2.1.0 beta

The headline features of sbt 2.1.0 are: Scala 3.9.0 on metabuild, ivyless publishing updated clean task, testing UX improvements, and various performance improvements.
Eugene Yokota (@eed3si9n)

Scala Days, Oct 12th - 13th, Berlin, Germany

We are very happy to announce that the Scala Days 2026 conference will be taking place 12 - 13 October in Berlin, Germany, one of Europe’s most vibrant tech and open source hubs, known for its strong culture of collaboration and its growing role in advancing digital sovereignty through open technologies.
Scala Days (@scaladays)

Scala Summit, Oct 19th, San Francisco

Scala Summit is a community-run, single-day conference.
Scala Summit (@BayAreaScala)

J On the Beach, Oct 29th - 30th, Malaga, Spain

A Pure Tech and Fun Conference for All Things Data.
J On The Beach (@JOTBConf)

Lambda World, Oct 29th. - 30th, Malaga, Spain

Experience the sunshine, the code, and the unforgettable vibe that made Lambda World 2025 shine in Málaga.
Lambda World (@lambda_world)

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