Scala 3 / No Indent

Discussing why significant indentation in Scala 3 can be problematic and the benefits of switching back to braces.
Alexandru Nedelcu (@alexelcu)

Scala 3 / Match Types

Exploring match types in Scala 3, a powerful type-level programming feature for type transformation and computation.
Alexandru Nedelcu (@alexelcu)

Rethinking Gatling

While Gatling Frontline remains a solid enterprise option, this approach demonstrates that open-source Gatling can be effectively modernized for contemporary workflows.
Michał Wiącek

Scala 3 / HOCON Parsing

How to parse HOCON in Scala 3? How to use Circe for HOCON? How to work with multiple JSON codecs per data structure?
Alexandru Nedelcu (@alexelcu)

Scala vs F#

Which language leans more towards functional programming? In this binary choice, people have perceived F# to be that language, due to its ML roots, but I have a different perspective...
Alexandru Nedelcu (@alexelcu)

Sanely-automatic derivation

Or how type class derivation works and why everyone else is doing it wrong.
Mateusz Kubuszok (@MateuszKubuszok)

Demystifying Scala 3 Types

​Scala 3 offers a rich and expressive type system—but to unlock its potential you need to understand it. In this talk we will walk you through the key concepts, including bounds, kinds, variance, type lambdas, type and kind lattices, polymorphic functions, abstract types, and wildcard type arguments. We'll give you mental models that can help you use the type system effectively in your day-to-day Scala coding.
Bill Venners (@bvenners)

Haoyi Li on Mill, Scala at Scale, Conference Touring and Moving Up the Stack

Haoyi Li is a software engineer and a core contributor to the Scala ecosystem. He's built a whole suite of Scala libraries under the com.lihaoyi banner, focusing on simplicity and productivity, as well as the Mill build tool, which he has since expanded beyond Scala to support other JVM tools like Java and Kotlin and experimental support for other things like TypeScript and Android, and promises better performance and user friendliness than Gradle and Maven can ever match. He's also the author of the book Hands-on Scala Programming, which focuses on getting things done with Scala.
Li Haoyi (@li_haoyi)

Mill 1.1.0 RC1

introduces config-based module definitions via YAML and single-file scripts, streamlining builds for simpler projects while keeping advanced code-based builds available. The release drops support for legacy file suffixes.
Li Haoyi (@li_haoyi)

Expecty 0.17.1

A macro library that provides descriptive failure messages for assertions.
Eugene Yokota (@eed3si9n@eed3si9n)

sbt 1.12.0-M1

A binary compatible release focusing on new features including Scala 3.8 REPL support.
Eugene Yokota (@eed3si9n)

sharaf 0.14.0

SSE support, named tuples support in queries and forms, union types support, and http4s integration module.
Sakib Hadžiavdić (@sake_92)

etl4s 1.6.1

New release with lazy by-name constructors as default, passthrough behaviour for nodes, and convenience overloads for unsafe run operations.
Matt Lilley

Hacking Macropads & Introduction to JVM Observability, Nov 12th, Wrocław, Poland

Join us on 12th November 2025 at 18:00 in Hard Rock Cafe Wrocław for another evening of Scala, systems, and great discussions over good food and drinks. 🍻 This time we have two exciting talks that bridge deep technical insights with real-world experience — from JVM observability to Scala Native hacking.
Wrocław Scala User Group (@WroclawScala)

Designing Simpler Scala Build Tools with Object-Oriented Programming, Nov 17th, Boston, USA

This talk will explore why build tooling is fundamentally such a difficult domain to work in, and how common concepts from object-oriented programming have the potential to simplify the build tool experience. We will end with a demonstration of the Mill build tool that makes use of these ideas, proving out the idea that Scala build tooling has the potential to be much faster, safer, and easier than it is today.
Boston Area Scala Enthusiasts

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