iiinova — where your digital self keeps evolving

How do you evolve messages without breaking production? Jan-Pieter van den Heuvel talk covers schema compatibility, safe changes, rollout strategies, failure handling, JSON vs. Protobuf vs. Avro, and how schema registries enforce contracts at scale. scaladays.org/sessio...

Red promotional graphics with a white “left Bracket” icon. Text reads: Stop Breaking Production – Schema Evolution Demystified

Red promotional graphics for ScalaDays, featuring a large white “left bracket”. Text reads: 2026 Scala Days Berlin, with the ScalaDays icon in the top right.

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Scala Days @scaladays.org · 05/10/2026

Join the #ScalaDays community online on 12-13 October and experience the conference from anywhere! Learn more: scaladays.org/attend... Get your Online Only Ticket: scaladays.org/#ticke...

The red background graphics featuring a bold teal bracket on the right. Text overlay reads "Get your online ticket" and "12-13 October. Online" below. 2026 ScalaDays Berlin text is beneath that..

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Scala Days @scaladays.org · 05/10/2026

#ScalaDays schedule is live. Bookmark talks and add them to your calendar, get reminders, and network via a digital business card in our official app. Make the most of every moment in Berlin! Download: scaladays.org/get-th... Schedule: scaladays.org/schedu...

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Scala Days @scaladays.org · 05/10/2026

Become a stage manager at #ScalaDays and attend the two-day conference for free! Connect with speakers, engage with the community, and hear top-quality talks about #Scala. Sign up now: scaladays.org/volunt...

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Scala Days @scaladays.org · 02/10/2026

Thanks to everyone who has signed up to volunteer at this year's ScalaDays. 🙌 We still have a few openings for stage management. If this sounds up your sleeve, please check out this page and get in touch: scaladays.org/volunt...

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Scala Days @scaladays.org · 01/10/2026

We’re spotlighting JetBrains, #ScalaDays Gold Sponsor. Find them at their booth, and they will be more than happy to hear what improvements you would like to see in the future of IntelliJ IDEA. Learn more on our blog: scaladays.org/meet-o... #JetBrains

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Scala Days @scaladays.org · 01/10/2026

A reminder that standard tickets for #ScalaDays are still available. If you or a colleague is yet to grab a seat at this year's gathering of scala developers and enthusiast, you should do so before the switch to last minute ticket sales! Get a ticket: scaladays.org/#ticke...

Blue promotional graphics, featuring a tall building. Text reads: Standard tickets are still available with '2026 Scala Days Berlin' at the bottom left.

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Scala Days @scaladays.org · 30/09/2026

We're pleased to welcome Signify Technology as a Barista Sponsor for ScalaDays 2026. Their support will help keep the Scala community energised throughout the event. Learn more about Signify Technology: signifytechnology.co... Thank you for supporting #ScalaDay!

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Scala Days @scaladays.org · 30/09/2026

A look at the people behind this year's #ScalaDays program. We celebrate each of them for their thoughtful perspectives and for helping make this year’s conference possible. 👏 Be sure to say hi when you spot them at the conference! scaladays.org/progra...

Colored geometric shape with an overlaying image. Text reads: Prof. Andrei Kucharavy

Colored geometric shape with an overlaying image. Text reads: Seth Tisue

Colored geometric shape with an overlaying image. Text reads: Prof. Dimi Racordon

Colored geometric shape with an overlaying image. Text reads: Noel Welsh

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Scala Days @scaladays.org · 29/09/2026

Alex Nemish will be at #ScalaDays, where he explores how multi-stage metaprogramming can turn a simple lambda-calculus interpreter into a just-in-time compiler. More: scaladays.org/sessio... 12-13 October. Berlin

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Scala Days @scaladays.org · 29/09/2026

It's exactly 2 weeks until #ScalaDays 2026; make your profile picture ScalaDays-ready! We created a fun tool so you can add some ScalaDays flair to your avatar and show the community you’re joining us in Berlin this fall. Try it here: scaladays.org/scalad..., and do tag us!

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Scala Days @scaladays.org · 28/09/2026

Join Rikito Taniguchi at #ScalaDays to explore the current state of Scala on WebAssembly with Scala.js and scala-wasm, WASI, sandboxing, serverless applications, and the Component Model. Details: scaladays.org/sessio... 12-13 October. Berlin

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Scala Days @scaladays.org · 25/09/2026

Noel Welsh will also be giving a talk explaining how capability-passing works and how to use it to implement a simple terminal user interface library. Check it out: scaladays.org/sessio... 12-13 October. Berlin

Red promotional graphics with a white “left Bracket” icon. Text reads: Simpler User Interfaces with Capability-Passing

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Scala Days @scaladays.org · 25/09/2026

Join Pavel Kozlov at #ScalaDays, where he shares lessons from real-world Scala projects and explores how functional programming can help teams avoid legacy OOP patterns, reduce complexity, and build more maintainable systems. More: scaladays.org/sessio... 12-13 October. Berlin

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Scala Days @scaladays.org · 24/09/2026

Mateusz Kubuszok shares the engineering lessons behind SGE, covering Java ecosystem porting, cross-platform tooling, Scala Native, and native dependencies. Learn more: scaladays.org/sessio... 12-13 October. Berlin

Red promotional graphics with a white “left Bracket” icon. Text reads: Scala’s LibGDX: A Report from the Trenches

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Scala Days @scaladays.org · 24/09/2026

Is metaprogramming just functional programming? Join Kathryn Frid to explore the connections and differences between the two: from map and flatMap to inline, quotes, splices, IO, and program analysis. More: scaladays.org/sessio... 12-13 October. Berlin

Red promotional graphics with a white “left Bracket” icon. Text reads: Is metaprogramming just functional programming?

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Scala Days @scaladays.org · 23/09/2026

In this hands-on lab by Piotr Janczy at #ScalaDays, explore direct-style Scala with Tapir, Ox, typed SQL, sttp, virtual threads, and AI coding assistants. You’ll also migrate Future-based code to direct style. Details: scaladays.org/sessio... 12-13 October. Berlin

Red promotional graphics with a white “left Bracket” icon. Text reads: Build a production service with VirtusLab Scala Stack and AI

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Scala Days @scaladays.org · 23/09/2026

We’re spotlighting VirtusLab, Platinum Sponsor of #ScalaDays 2026. Meet the team at their booth and catch their sessions on AI, WebAssembly, LLMs, Scala tooling, and more. Read more: scaladays.org/meet-o... #VirtusLab

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Scala Days @scaladays.org · 23/09/2026

AI agents can generate Spark pipelines fast, but untyped DataFrames make subtle data bugs easy to ship. Joan Goyeau's talk introduces 𝗪𝗶𝗰𝗸: a type-safe Spark API encoding schemas, types, and nullability while preserving Catalyst performance. scaladays.org/sessio... 12–13 October in Berlin.

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Scala Days @scaladays.org · 22/09/2026

Debugging in Scala can be frustrating, but it doesn’t have to be. This talk by Maciej Gorywoda will teach you how to pinpoint bugs faster and with less hassle using features of IntelliJ IDEA’s debugger. Check it out: scaladays.org/sessio... 12-13 October. Berlin

Red promotional graphics with a white “left Bracket” icon. Text reads: Mastering IntelliJ IDEA’s Debugger for Scala Development

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Scala Days @scaladays.org · 22/09/2026

Join James You at #ScalaDays, where he shares a new approach to specialization in Scala 3 based on inline traits. Learn how compiler transformations can deliver high-performance generic code without sacrificing the productivity of generics. More: scaladays.org/sessio... 12-13 October. Berlin.

Red promotional graphics with a white “left Bracket” icon. Text reads: Inline Traits for Specialization

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Scala Days @scaladays.org · 21/09/2026

You can still take advantage of our partnership with Deutsche Bahn for exclusive DB event tickets for long-distance travel throughout Germany (ICE, IC/EC). Enjoy your travel to Scala Days at an affordable rate. Book your journey: scaladays.org/travel... Join us 12-13 October. Berlin.

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Scala Days @scaladays.org · 21/09/2026

A reminder that you need to register for the Workshops at #ScalaDays 2026 to participate. These are focused, hands-on days with room to actually practise, and they require a separate ticket. Workshop details: scaladays.org/worksh...

Blue promotional graphics, featuring a tall building. Text reads: Reminder: ScalaDays Workshop Registration with '2026 Scala Days Berlin' at the bottom left.

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Scala Days @scaladays.org · 18/09/2026

Learn to diagnose real-world production failures in a distributed Typelevel streaming platform with Antonio Jimenez and Maksym Ochenashko. Details: scaladays.org/sessio... 12–13 October. Berlin.

Red promotional graphics with a white “left Bracket” icon. Text reads: A Distributed System On Fire: Diagnosing Failures with otel4s

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Scala Days @scaladays.org · 18/09/2026

Satellite Events Spotlight. This satellite event is open to (aspiring) Typelevel users, contributors, and anyone curious to learn more about functional programming, no matter your prior experience. Learn more: scaladays.org/satell...

Event banner for “Typelevel Traverses Berlin,” part of ScalaDays 2026, featuring a tall building and event details.

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Scala Days @scaladays.org · 16/09/2026

Satellite Events Spotlight: VIP Tech Walk Through Berlin This is a fantastic way to walk the city of Berlin in an open conversation about where Scala is heading in 2026 and much more, with the engineers who work on the core of Scala 3. Find out more: scaladays.org/satell...

Event graphics for “Pre-Conference Tech Walk Through Berlin,” part of ScalaDays 2026, featuring a tall building and event details.

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Scala Days @scaladays.org · 16/09/2026

Weighing whether to bring your team to #ScalaDays 2026? Groups of 5+ get an automatic 10% off. Give your engineers leading-edge knowledge from talks and workshops, and help them connect with the community behind the tools they use. Get your tickets: scaladays.org/#ticke...

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Scala Days @scaladays.org · 15/09/2026

L Denney will take the stage at #ScalaDays to share his journey into Scala and his first contributions to open source. His talk will also explore making data structures optimizations approachable, worthwhile, and fun. More: scaladays.org/sessio... 12-13 October. Berlin.

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Scala Days @scaladays.org · 15/09/2026

Jacek Kunicki will be at #ScalaDays for a look at the VirtusLab Scala Stack: a combination of established Scala libraries and new innovations designed around a direct style. Learn more: scaladays.org/sessio... 12-13 October. Berlin.

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Scala Days @scaladays.org · 14/09/2026

Caching boosts performance, but implementing it safely is challenging. At #ScalaDays, Katrina Petrevice will show how Cats Ref enables thread-safe, testable caches while preserving functional purity. Details: scaladays.org/sessio... 12–13 October · Berlin

Red promotional graphics with a white “left Bracket” icon. Text reads: Caching in Scala using Cats Ref

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Scala Days @scaladays.org · 14/09/2026

Been to Scala Days before? We could use your insight—because nobody knows what a first Scala Days is really like better than someone who’s already been. We’re asking the regulars: What’s the one thing you’d tell a first-timer? Reply with your tip for first-timers! #ScalaDays

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Scala Days @scaladays.org · 12/09/2026

In this hands-on lab by Arman Bilge, you’ll create widgets in pairs and explore IO, Resource, Stream, Signal, and fibers through real-time experimentation. A practical introduction to the Typelevel stack and functional frontend development. Learn more: scaladays.org/sessio...

Red promotional graphics with a white “left Bracket” icon. Text reads: Build a webapp with Cats Effect and FS2

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Scala Days @scaladays.org · 12/09/2026

What can functional programming teach us about software architecture? Michael Sperber's session shares six years of experience teaching the FUNAR curriculum through Scala exercises, including a complete web application. More: scaladays.org/sessio... 12-13 October. Berlin.

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Scala Days @scaladays.org · 10/09/2026

Join Patryk Zieliński for a look at how the maintenance of open source projects, including the Scala 3 compiler, changes when AI-generated issues, comments, PRs, and even design proposals start showing up. Learn more: scaladays.org/sessio... 12-13 October. Berlin. #ScalaDays

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Scala Days @scaladays.org · 09/09/2026

Join James Thompson as he shares an experience report on the process and progress of improving the Standard Library, Scala Toolkit, and other core Scala modules under the resources provided by the Sovereign Tech Agency. Learn more: scaladays.org/sessio... 12-13 October. Berlin.

Red promotional graphics with a white “left Bracket” icon. Text reads: Report: where are we going with the Standard Library?

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Scala Days @scaladays.org · 08/09/2026

This talk by Anatolii Kmetiuk introduces Scoverage, showing how to measure test coverage with a compiler flag and how coverage instrumentation interacts with features like pattern matching, capture checking, tail recursion, closures, and JVM limits. More scaladays.org/sessio...

Red promotional graphics with a white “left Bracket” icon. Text reads: Scoverage: Test Coverage for the Scala Codebases

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Scala Days @scaladays.org · 07/09/2026

Krzysztof Romanowski's session explores a practical toolkit for Scala teams: Context Fabric, CI built for machine speed, tiered review, and testing strategies for the AI era. Come learn how to improve productivity and quality together, one component at a time. Details: scaladays.org/sessio...

Red promotional graphics with a white “left Bracket” icon. Text reads: AI Multiplies — Let Scala Hold the Line

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Scala Days @scaladays.org · 04/09/2026

Jamie Thompson will also be at the main conference on an interesting lab on becoming effective with the Laminar library for Scala.js: avoiding sloppy code, managing events, and asynchronous communication with the backend. Details: scaladays.org/sessio... 12-13 October. Berlin.

Red promotional graphics with a white “left Bracket” icon. Text reads: Reactive UI with Laminar

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Scala Days @scaladays.org · 03/09/2026

Tests and types are correctness gates - but who verifies the gates themselves? This talk by Valentin Bergeron explores how theorem provers can move from academic tools to practical production safeguards. Session details: scaladays.org/sessio... 12–13 October · Berlin

Red promotional graphics with a white “left Bracket” icon. Text reads: Stop testing, start proving

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Scala Days @scaladays.org · 03/09/2026

Generative AI output can be uneven. In his #ScalaDays talk, Bill Venners presents an engineering approach to improving AI-generated content before human review, using a Scala Center project to improve standard library documentation as a case study. Details: scaladays.org/sessio... 12–13 October ·

Red promotional graphics with a white “left Bracket” icon. Text reads: Quality Pipelines for Generative AI

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Scala Days @scaladays.org · 02/09/2026

Learn to get more from Cursor, Claude Code, and other AI tools in this handson workshop with Piotr Oramus and Łukasz Biały. Explore where AI agents work well with Scala, where they fail, and how to build scalable workflows for unfamiliar codebases. More: scaladays.org/sessio... 14-15 October.

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Scala Days @scaladays.org · 02/09/2026

At #ScalaDays 2026, Benjamin Meyer and @marcelluethi will showcase machine learning with DimWit and share lessons from training GPT-2 from scratch in Scala. Full session details: scaladays.org/sessio... 12–13 October · Berlin

Red promotional graphics with a white “left Bracket” icon. Text reads: DimWit – Tensor programming with wit

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Scala Days @scaladays.org · 01/09/2026

scala-wasm enables Scala on Wasm runtimes, but core libraries must also support Wasm/WASI. At #ScalaDays, Mariusz Jakoniuk will explore Cats Effect and FS2’s core I/O mechanisms and their prototype implementation for WASI 0.2. Details: scaladays.org/sessio... 12–13 October · Berlin

Red promotional graphics with a white “left Bracket” icon. Text reads: Cats Go Wasm/WASI: Typelevel on Server-side WebAssembly

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Scala Days @scaladays.org · 01/09/2026

First Scala Days? The 2026 program has you covered. Beginner-friendly sessions, a supportive space, and hands-on interactive labs designed to get you confident fast. Tickets are still live, get a seat here: scaladays.org/#ticke... #ScalaDays

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Scala Days @scaladays.org · 31/08/2026

We have made #ScalaDays 2026 accessible to everyone by providing fully sponsored Diversity Tickets. This is for anyone who wouldn't be able to participate in the conference otherwise. Learn more: scaladays.org/divers... __ Please consider sponsoring a diversity ticket if within your capacity.

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Scala Days @scaladays.org · 31/08/2026

In this workshop, Bill Venners guides participants through Scala 3 exercises using modern AI coding tools and agents. Learn practical workflows, review loops, and multi-agent techniques for building quality-focused AI development workflows. More details: scaladays.org/sessio... #ScalaDays

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Scala Days @scaladays.org · 28/08/2026

Standard tickets for #ScalaDays 2026 is now live! If you missed the early bird tickets, you can still be a part of the conference this year. Get a ticket: scaladays.org/#ticke...

Blue promotional graphics, featuring a tall building. Text reads: Standard tickets are now available with '2026 Scala Days Berlin' at the bottom left.

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Scala Days @scaladays.org · 27/08/2026

The program committee has been deep into planning and is excited to share the full program for this year’s #ScalaDays! We have a total of 46 sessions - including talks, workshops, and interactive labs- with a discussion session. Browse the full session list here: scaladays.org/sessio...

Red promotional graphic. Text reads: Explore the full schedule! with 2026 ScalaDays Berlin, featuring city buildings in the background.

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