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March 27th, 2026, ISSUE 613

READING

Porting the Scala 2 optimizer to Scala 3

In early microbenchmarks of code written in a high-level functional style, we’re seeing 10-30% faster execution.
Solal Pirelli (@SolalPirelli)
Scala: Learning Roadmap

Step-by-step guide to become a Scala developer in 2026.
Job-focused list of product companies using Scala in production

Discover startups and product teams using Scala in production.
Yaroslav Podorvanov
Protobuf Goes Scala-First

My journey toward regaining developer productivity while working with Protobuf in a large Scala codebase.
Pierre Ricadat (@ghostdogpr)
Metaprogramming: teaching the compiler to explain your data

Compile-time reflection and metaprogramming are powerful tools for automating boilerplate and generating rich representations.
Oleksiy Prosyanko

VIDEOS

Scala metaprogramming, reflection beyond mirrors by

The presentation looks at the two main approaches available in Scala 3 — mirrors and macros — and argues that while mirrors are common, they often lead to awkward code, unsafe casts, and poor runtime output. In contrast, macros give developers type safety, composability, and full control over the code they generate.
Kalin Rudnicki

RELEASES

cellar

CLI tool for coding agents and developers to query the public API of any Maven JVM dependency — get symbol signatures, list packages, search by name, and inspect dependency trees. Powered by Coursi...
Jędrzej Rochala
IntelliJ Scala Plugin 2026.1 Is Out!

Faster project sync times, BSP connection file, bspEnabled flag support and other improvements. Support for projects in Dev Containers and WSL, unified UI/UX for Scala highlighting mode settings, scaladoc support, AI Assistant: Next edit suggestions for Scala.
Maciej Gorywoda (@makingthematrix)
scala-neural-language-model

Neural language model built from scratch in Scala 3 with GPU acceleration via Apple Metal - chiloanerk/scala-neural-language-model
Rele

EVENTS

Lightweight Declarative Scala Builds with Mill 1.1.0 & ALPACA, Tue, Mar 31st, Kraków, Poland

The Krakow Scala User Group hosts an evening meetup focused on Mill 1.1.0, the declarative Scala build tool, and ALPACA. A great opportunity to explore modern, lightweight alternativs to sbt in a collaborative setting.
Kraków Scala User Group
The Scala Workshop CFP, Jun 29th, Brussels, Belgium

CFP ends on Mar 23th!
Scala Workshop
Announcing Scala Days 2026

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 Contributors (@scala_lang)
J On the Beach, Oct 29th - 30th, Malaga, Spain

A Pure Tech and Fun Conference for All Things Data. Join the CFP, open until March 31st.
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. CFP open until March 31st.
Lambda World (@lambda_world)





  1. Scala Times Issue #613

    Porting the Scala 2 optimizer to Scala 3. Scala: Learning Roadmap. Job-focused list of product companies using Scala in production. Protobuf Goes Scala-First. Metaprogramming: teaching the compiler to explain your data.


  2. Scala Times Issue #612

    Generating Direct-Style Scala 3 Applications. ScalaWAW #39 - Scalar warmup!, Mar 25th, Warsaw, Poland. Scalar, Mar 26th - 27th, Warsaw, Poland. The Scala Workshop CFP, Jun 29th, Brussels, Belgium. J On the Beach, Oct 29th - 30th, Malaga, Spain.


  3. Scala Times Issue #611

    Migrating sbt plugins to sbt 2 with sbt2-compat plugin. Tracking Capabilities for Safer Agents. Hardening Scoverage Support in Scala 3. Introducing PureLogic: direct-style, pure domain logic for Scala. Rage Against the (Plurality of) Effect Systems.


  4. Scala Times Issue #610

    How I used AI to modify hundreds of logs messages. Hybrid IO-Driven Promise. The Effect Pattern and Effect Systems in Scala. Fairstream: Fair Backtracking. Scala Standard Library Process.


  5. Scala Times Issue #609

    Practical observability: distributed tracing with otel4s. Forms4s: Rapid (Internal) UI Development. Postmortem of scala/scala3#24994. The Sovereign Tech Fund invests in Scala. Two Months of Vibe-Coding: Scala, Constraints, Trust and Shipping.


  6. Scala Times Issue #608

    ZIO Golem: Bringing Golem to Scala. Practical FP in Scala is now FREE!. Direct-style property based testing. RFC: sbt 2.0 on JDK 17. Business4s H2 2025 Highlights.


  7. Scala Times Issue #607

    Scala 3 slowed us down?. Coroutines, Event Loops - Build Your Own in Scala. Advent of Code 2025 in Scala (Solutions). Make delightful web apps with Scala and Krop!. Apache Pekko 2.0.0-M1.


  8. Scala Times Issue #606

    First class support for compilation profiling. Understanding Capture Checking in Scala. Laminar components inside React. Save your Scala apps from the LazyValpocalypse. To Effect or Not to Effect - a Scala Perspective.


  9. Scala Times Issue #605

    Join us for the Advent of Code 2025. Scala Days 2025: Conference Highlights and Talk Recordings. Metals v1.6.4 - Osmium. Scalar, Mar 26th - 27th, 2026, Warsaw, Poland.


  10. Scala Times Issue #604

    Pekko Core 1.3.0. Scalar 2026: Call for Speakers.


  11. Scala Times Issue #603

    Master ZIO: Functional Effect System. Better explanation of what Business4s is. ClickHouse with PlayFramework, Slick, and Evolutions.


  12. Scala Times Issue #602

    Scala 3 / No Indent. Scala 3 / Match Types. Scala 3 / HOCON Parsing. Scala vs F#. Demystifying Scala 3 Types.


  13. Scala Times Issue #601

    An Omakase-style PlayFramework Template: PlayFast. How to run sbt tasks with custom settings. Alexandru Nedelcu | Effects and concurrency in functional programming. Metals v1.6.3 - Osmium. LLM4s Dev Hour – Sundays @ 9am London Time.


  14. Scala Times Issue #600

    One Script, Many Styles - Exploring Scala’s Ecosystem with scala-cli. A simple tool to make illegal states unrepresentable. Exploring Neotype’s capabilities, pitfalls, and limitations in Scala 3. IntelliJ IDEA x Scala: The Debugger (Part 1). Announcing ZIO Test support in scalamock classic (released in 7.5.0).


  15. Scala Times Issue #599

    An old coding challenge I resolved with Scala. Controlling program flow with capabilities. A new repository for Scala nightlies. Effects and concurrency in functional programming. Meet new release of jsoniter-scala with much faster codec derivation.


  16. Scala Times Issue #598

    Effects as Capabilities. Claude Code, Metals, and NVIM. Integrate JobRunr into Play Framework [Update Sep 2025]. Random Scala Tip #534: Adopt an Error Handling Convention for `Future`. Announcing Scala.js 1.20.1.


  17. Scala Times Issue #597

    Understanding Match Types in Scala 3. Scala's Gamble with Direct Style. Custom Error Types Using Cats Effect and MTL. Dealing with Java builder's pattern. Implementing a JWT-based authorization for zio-http.


  18. Scala Times Issue #596

    The Rebirth of Tagless Final: An Ergonomic Approach in Kyo. Hands on Capture Checking. PRE-SIP: Dedented Multiline String Literals. Match Type simulator. LLM4s Dev Hour – Sundays @ 9am London Time.


  19. Scala Times Issue #595

    State of Scala 2025 Survey. Claude Code, Metals, and NVIM. Minimal Scala Container Images using Nix. IntelliJ Scala Plugin 2025.2. Release ducktape 0.2.10 · arainko/ducktape · GitHub.


  20. Scala Times Issue #594

    Golden Literal Testing in uTest 0.9.0. Nussknacker integration with Functional Programming. Type-safe vibe-coding a CRUD application. LLM4s Dev Hour – Sundays @ 9am London Time. Scala Days, Aug 19th - 21st, Lausanne, Switzerland.


  21. Scala Times Issue #593

    Understanding Scala Variance. LLM4s Dev Hour – Sundays @ 9am London Time. Scala Days, Aug 19th - 21st, Lausanne, Switzerland. The Scala Workshop, Oct 13th, Singapore. DEVJVM, Oct 25th, Barranquilla, Colombia.


  22. Scala Times Issue #592

    LLM4s Dev Hour – Sundays @ 9am London Time. Scala Days, Aug 19th - 21st, Lausanne, Switzerland. The Scala Workshop, Oct 13th, Singapore. DEVJVM, Oct 25th, Barranquilla, Colombia.


  23. Scala Times Issue #591

    Scala Days, Aug 19th - 21st, Lausanne, Switzerland. The Scala Workshop, Oct 13th, Singapore. DEVJVM, Oct 25th, Barranquilla, Colombia. Mill Build Tool v1.0.0 Release Highlights. Business4s H1 2025 Highlights.


  24. Scala Times Issue #590

    Scalator: Stream Composition with Kyo & Community Revival!, Jul 9th, Toronto. Scala Days, Aug 19th - 21st, Lausanne, Switzerland. The Scala Workshop, Oct 13th, Singapore. CFP for DEVJVM, Oct 25th, Barranquilla, Colombia. Anatomy of a Scala Game Server.


  25. Scala Times Issue #589

    Scala Highlights, June 2025 edition. ScalaWAW #35 - Summer hackathon, Jun 30th, Warsaw, Poland. Scala Days, Aug 19th - 21st, Lausanne, Switzerland. The Scala Workshop, Oct 13th, Singapore. Making Capabilities Safe and Convenient.


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