Designing the library powering Netflix's QoE with Scala 3

​From raw data to business metrics, Netflix calculates more than 750 measures like: hours streamed, play delay, rebuffers… across multiple teams and at scale!

Join me to understand how Scala 3 played an important role in designing the library that powers those measures, using direct style, opaque types, typeclasses, macros...

​About Joan Goyeau

​Joan is a Playback Data Engineer in the Data Science and Engineering org at Netflix.

​As a functional programming enthusiast, Scala is his weapon of choice due to its grammatical simplicity combined with its powerful features.

​He is often contributing to Scala related open source projects like Mill, Kubernetes Client, Avro4s...

​Learn more about Joan Goyeau on LinkedIn

Event Details

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Let's Teach LLMs to Write Great Scala! By Kannupriya Kalra

​Large Language Models (LLMs) are transforming how we build intelligent applications, but most tooling and best practices are centered around Python. Why should Python have all the fun? In this talk, we'll explore how LLMs work, from zero-shot prompting to agentic feedback loops, and discuss why typed languages like Scala offer a better foundation for building reliable, maintainable AI-powered applications.

​We'll examine lessons from Python’s ecosystem—LangChain, LiteLLM, and PydanticAI—and why Scala deserves its own first-class LLM toolkit. Enter LLM4S, a project bringing structured, type-safe AI development to Scala. We'll dive into how we can leverage Scala’s strengths for robust tool calling, multi-step workflows, and agentic programming.

​Join us to see how we can teach LLMs to generate great Scala code—and why that’s a game-changer for AI development.

​About Kannupriya Kalra

​Kannupriya Kalra is a functional programming enthusiast and Scala developer with 10 years of experience in building scalable software solutions. Currently a Software Engineer at Sky in London, she develops and maintains critical backend applications using functional Scala. She has previously contributed to Scala projects in various organizations in India, focusing on data engineering. Her expertise includes Scala, Akka, and big data technologies.

​As a Google Summer of Code 2024 mentor with Scala Center, she contributed to Scaladex and Scala CLI projects. Additionally, Kannupriya is the org admin for the Google Summer of Code 2025 program with Scala Center, where she plays a pivotal role in guiding and shaping future open-source contributions. In 2024, she represented Scala Center at the Google Open Source Conference in Sunnyvale, California. With a passion for sharing knowledge, Kannupriya has delivered talks in four countries, inspiring and engaging developers worldwide.

​Learn more about Kannupriya Kalra on LinkedIn

Event Details

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Functional Programming in Scala is a set of three lectures that – as the title suggests – introduce you to the concepts of Functional Programming, with Scala being the programming language of the examples. During this short course, you will learn how to work with functions as first-class citizens of your code, how to use pattern matching and recursion to obtain complex yet readable code, and finally, what a monad is and what to do with it.

​In total, there are about four and a half hours of material: 1.5 hours of lecture on the basics and another 1.5 hours of joint work between the lecturer and students, where we use the knowledge from the previous lesson to write two more complicated programs, while discussing the details of programming in Scala, and another 1.5 hours of lecture on monads and effects systems. The whole series consists of slides and real-time programming. For coding we will use IntelliJ IDEA with the Scala Plugin.

​About our speaker

​Maciej Gorywoda is a Product Marketing Manager in the IntelliJ Scala Plugin team at JetBrains. In 2005, he graduated from the Warsaw University of Technology with an MSc in Artificial Intelligence. He started working with Scala in 2014, and since then, it has become his favourite programming language for both professional work and various hobby projects. He speaks at conferences and produces YouTube videos on the basics of Functional Programming, Scala on Android, and Artificial Intelligence in video games. In 2024, he became an official Scala Ambassador.

​In his free time, Maciej writes fantasy, trains martial arts, and goes on long-distance bicycle trips.

Event Details

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Also available on our YouTube here:

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Functional Programming in Scala is a set of three lectures that – as the title suggests – introduce you to the concepts of Functional Programming, with Scala being the programming language of the examples. During this short course, you will learn how to work with functions as first-class citizens of your code, how to use pattern matching and recursion to obtain complex yet readable code, and finally, what a monad is and what to do with it.

​In total, there are about four and a half hours of material: 1.5 hours of lecture on the basics and another 1.5 hours of joint work between the lecturer and students, where we use the knowledge from the previous lesson to write two more complicated programs, while discussing the details of programming in Scala, and another 1.5 hours of lecture on monads and effects systems. The whole series consists of slides and real-time programming. For coding we will use IntelliJ IDEA with the Scala Plugin.

​About our speaker

​Maciej Gorywoda is a Product Marketing Manager in the IntelliJ Scala Plugin team at JetBrains. In 2005, he graduated from the Warsaw University of Technology with an MSc in Artificial Intelligence. He started working with Scala in 2014, and since then, it has become his favourite programming language for both professional work and various hobby projects. He speaks at conferences and produces YouTube videos on the basics of Functional Programming, Scala on Android, and Artificial Intelligence in video games. In 2024, he became an official Scala Ambassador.

​In his free time, Maciej writes fantasy, trains martial arts, and goes on long-distance bicycle trips.

Event Details

SUBSCRIBE TO OUR MEETUP GROUPS ABOVE ^^

Also available on our YouTube Channel (please subscribe):

https://youtu.be/H0rR0XhxMEg

Functional Programming in Scala is a set of three lectures that – as the title suggests – introduce you to the concepts of Functional Programming, with Scala being the programming language of the examples. During this short course, you will learn how to work with functions as first-class citizens of your code, how to use pattern matching and recursion to obtain complex yet readable code, and finally, what a monad is and what to do with it.

​In total, there are about four and a half hours of material: 1.5 hours of lecture on the basics and another 1.5 hours of joint work between the lecturer and students, where we use the knowledge from the previous lesson to write two more complicated programs, while discussing the details of programming in Scala, and another 1.5 hours of lecture on monads and effects systems. The whole series consists of slides and real-time programming. For coding we will use IntelliJ IDEA with the Scala Plugin.

​About our speaker

​Maciej Gorywoda is a Product Marketing Manager in the IntelliJ Scala Plugin team at JetBrains. In 2005, he graduated from the Warsaw University of Technology with an MSc in Artificial Intelligence. He started working with Scala in 2014, and since then, it has become his favourite programming language for both professional work and various hobby projects. He speaks at conferences and produces YouTube videos on the basics of Functional Programming, Scala on Android, and Artificial Intelligence in video games. In 2024, he became an official Scala Ambassador.

​In his free time, Maciej writes fantasy, trains martial arts, and goes on long-distance bicycle trips.

Event Details

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Talk Title

​How Scala is made and how you can help?

​Talk Summary

​I am using Scala from 2011 and since 2019, part of my job (and the main reason I picked it) is to grow Scala and its community. In this talk I will explain the inner workings of an organisation that goes into releasing, maintaining and developing Scala and core parts of its ecosystem. I will discuss what are those parts, what problems the team of teams face and what you can expect in the future.

​Later, I will focus about ways to support the ecosystem. The help comes in various shapes and I will try to convince you that there is one that fits your needs.

​As build tools are my pet peeve, expect some Scala CLI and Bazel as well!

​Speaker

​Krzysztof Romanowski has dedicated the majority of his career to working on the Scala project and enhancing the Developer Experience (DX), often combining the two. He focuses on hands-on development of developer tools (like scala-cli) and leading teams working on Scala applications and DX/ developer tooling. Currently, he oversees the DX (tooling) and Scala departments at VirtusLab.

Event Details

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In December 2023 I bought myself a brand new Apple MacBook Pro (M3 Max). So I thought I record myself installing nix on there in case it is useful to anyone.

Note that this is just a short video showing me just installing Nix nothing else. I will record more about Nix in the future to take this further and share my knowledge.

Some useful references from my recording:

Also available on YouTube

You got Agda in my Haskell? By Ryan Orendorff

One of your coworkers seems to write the most amazing Haskell code. It never breaks and it always fits the requirements precisely. You’ve never seen your coworker put in a bug fix for their code ever. One day you decide to ask them how they obtained these inhuman powers. With a huge grin on their face, they say “why that’s because I wrote all my provably correct code in Agda!”

In this talk, we will talk about a new tool called agda2hs which allows programmers to translate dependently typed Agda code into clean Haskell code, enabling the extraction of provably correct programs. We will look into specific examples on how the code can be used to prove that a piece of code has some desired specification such as invertibility.

About our speaker

Hi! My name is Ryan Orendorff, and I enjoy working on type theory, functional programming, linear algebra, and data privacy. If I am not working on those things you can likely find me on a mountain somewhere.

Personal page and Blog: Ryan Orendorff

Event details: https://www.meetup.com/bay-area-haskell-user-group/events/290844236/

This Recording is also available on YouTube

Easy incremental builds with GHC 9.4 by Harry Garrood

One of the new features in GHC 9.4 is that GHC determines whether a source file has changed by checking its hash rather than its modification timestamp. I'll discuss why this is useful and how it can dramatically speed up your CI builds!

About our speaker

Harry Garrood is a software engineer based in Scotland, currently working with Mercury. He used to do a lot of OSS work, having been part of the PureScript core team, but now he spends less of his free time thinking about code, and more of it playing trombone, swimming, and playing video games.

Personal page and Blog: Harry Garrood

Event details: https://www.meetup.com/bay-area-haskell-user-group/events/288894864/

This recording is also available on our YouTube

A Tour through Swift Attributes By Marco Eidinger

Learn about System Programming Interfaces (SPI) in Swift (aka @_spi ) and other Swift Attributes and how/when to use those attributes.

About our speaker

Marco Eidinger is a Swift developer working on open source and enterprise mobile SDKs for iOS and macOS developers.

He writes weekly articles about Swift and iOS development and created open-source tools like:

SwiftPlantUML, an Xcode extension and command-line tool, to generate UML class diagrams from Swift code.

XCSnippetsApp, an macOS application to explore code snippets from the Swift and iOS community, view and edit the snippets before adding them conveniently to Xcode.

swift-package-dependencies-check, a GitHub action to detect outdated versions of your Swift package dependencies.

Follow Marco on Twitter and do visit his blog.

Event details: https://www.meetup.com/swift-language/events/289345691/

For more information about Swift Language User Group (San Francisco) visit:

https://www.sfswift.com

Also available on our YouTube