C & C++

Agenda: 18:00 Doors open 18:20 welcome, doors closing.. 18:30 From Reactive Streams, through Virtual Threads, to Flows - Adam Warski 19:30 break 20:00 Armeria: The Microservices Framework You Haven't Tried Yet - Dominik Dorn 21:00 networking **From Reactive Streams, through Virtual Threads, to Flows** Since Java's inception, the programming model has shifted from synchronous to asynchronous, and for good reasons: improved performance, higher throughput, and lower latency. Reactive Streams greatly simplified the development of reactive systems by incorporating elements of functional programming. However, with the introduction of Virtual Threads in Java 21, Java shifts back towards a purely synchronous model, while retaining high performance. Does this render initiatives like Reactive Streams obsolete? Can we combine the benefits of Reactive Streams with the approachability of Virtual Threads, the elasticity of modern Java, and the guarantees of functional programming? And what are the tradeoffs? **About Adam Warski** Adam Warski is the co-founder of SoftwareMill and head of R&D at VirtusLab, where he primarily generates code using Java, Scala, Rust and other interesting technologies. He is actively involved in open-source projects, such as Ox, Jox, Tapir, sttp, and others. He has also been a speaker at major conferences, including JavaOne, Devoxx, GeeCON and ScalaDays. In addition to writing closed- and open-source software, he spends his free time exploring various programming-related subjects. Any ideas or insights he gains usually end up on his blog ([https://warski.org/articles](https://warski.org/articles)). **Armeria: The Microservices Framework You Haven't Tried Yet** "One port to rule them all" .. that's the promise of Armeria, the microservice framework created by the creator of Netty, Trustin Lee. Armeria has built-in support for gRPC and Thrift, automatic endpoint descriptions (OpenAPI) and works with your Spring Boot App, your legacy Tomcat project or your dropwizzard app. We'll take a look at these (and more) features in this talk. **About Dominik Dorn** Dominik Dorn is a senior software engineer in Vienna and has been running the Java Vienna Meetup since \~2009. He has extensive knowledge in the Java and Scala ecosystems. He sometimes "tweets" on [https://x.com/domdorn](https://x.com/domdorn) . You can also find him on [Linkedin](https://www.linkedin.com/in/dominik-dorn/) where he happily accepts new connections from the community. He is doing freelance software consulting, so if your company needs help, he might have some resources left for helping you.

Get ready for an epic night of board games at the SpielBar! 🌟 We're hosting a monthly Meetup where you can dive into a world of fun, strategy, and laughter. From easy-going games for beginners to thrilling challenges for the pros, we have something for everyone. Don't worry about the rules; I'll be there to walk you through every step, ensuring a smooth and enjoyable experience for all. The SpielBar offers a fantastic selection of games, so you're in for a treat! RSVP now to secure your spot, and join us for an evening full of board games, and fun. 🎲🎉🏳️‍🌈 **How does it work?** We meet at 6:30 pm. Once we're gathered, we'll choose the games we want to play. If we're more than 6 people, we'll split up and play different games simultaneously. You can, of course, bring a board game with you and suggest it! We will finish the event by bringing everyone together again for a casual get-together.

Join me for a photo walk! :) To start off pride month, we will do a colour hunt. This means everyine gets assigned a colour that they will try to photograph during the walk :) We will gather at Burgtheater, than walk past Minoritenkirche, Cafe Central, Michaelerplatz and Zwidemu to MQ. There everyone is welcome to join me for a drink. The event is free of charge, and suitable for all ages and for any gear (phone is fine!) IMPORTANT: This photowalk is meant only for LGBTQIA+ people.

A Board Game Evening at Munchy The Urban Kitchen am Schottenring! Come, play, socialize, meet and enjoy! You can bring your own games or choose from the ones available. We have: * Jenga * Monopoly * Tabu * Uno and so on... We are excited to see you here! Enjoy your nice Monday evening! 🥳 [Follow us on Instagram](https://www.instagram.com/makingfriendsinvienna)❤️ [Follow us on Facebook](https://www.facebook.com/makingfriendsinvienna)💙 Do you have questions? Write us on Instagram 🎉

So hast du andere Leute in Wien wahrscheinlich noch nie kennengelernt! Bis zu 10 Singles, die sich zuvor nicht kennen, treffen sich in einer Bar und lernen sich bei einem eigens für diese Veranstaltungsreihe entwickelten Spiel näher kennen. Das Spiel kombiniert eine gelungene Mischung aus Fragen, Aktionsaufgaben und lustiger Unterhaltung, die alleine oder als Team gemeistert werden. Durch verschiedene Aufgaben und Fragen kommen die Spieler in direkte Interaktion miteinander und lernen sich im Spielverlauf näher kennen. Im Vergleich zur klassischen Single Party lernst du bei Socialmatch wirklich nur Singles in deiner Altersgruppe kennen und kommst von ganz alleine ins Gespräch mit den anderen Teilnehmern. Ein Spielmoderator vor Ort informiert über den Ablauf und leitet durch den Abend. Sicher dir jetzt deinen Platz beim nächsten Event unter [[www.socialmatch.de](http://www.socialmatch.de/)] und lerne neue Leute in deiner Stadt kennen. Dieses Event ist für die Altersgruppe 20 - 35 Jahre. P.S. Socialmatch erhielt 2015 bereits einen Award für das Konzept, teste es selbst ;-) **Achtung: Nur mit Buchung über die Website ist eine Teilnahme möglich!**

Hello Viennovans! Pickwick's is getting quizzical every monday night! You have a chance to win a round of shots, a 40€ bar tab and/or eternal bragging rights 😉 Teams of up to 6 people, reserve your spot today! Start time is 7! FREE SHOT FOR EVERYONE COMING FROM VIENNOVA!

There's something about tango that gets under your skin. You watched it, or tried it once, and something in you probably felt really good. Because tango is connetion in the present moment. Tango Fundamentals 1 is a structured 6-week course designed to take your tango journey through the basic steps and figures of Argentine tango. This is not just about copying moves - but rather actually understanding how tango works. The connection, the lead and follow, the conversation between two people through movement. By the end of these six weeks, you'll understand the basic concepts of tango, the etiquette of milongas, how to invite someone to dance - and you'll actually be able to dance. **What's included:** * 6 weekly classes - every Monday, 75 minutes each * Bonus 4 online evenings - stretching, strength, technique and mindfulness to support your body and focus in your Tango Journey * 1 Practica at the end - a real social dance to put it all together **Investment:** €165 full price, €125 for students. There is an option for classes without an online offer. Just write me a message. Single class: €28 / student €22 **This is for you if:** * You've tried tango once and want to go deeper * You've always wanted to learn but never knew where to start * You want a real foundation, not just a one-off workshop Spots are limited - this is a small group, so everyone gets proper attention. Drop a message here or reply directly to reserve your spot. 🙏

**Something about AI from a principal coder** Long term contributor and visitor of the Vienna GameDev Meetup and Principal Software Engineer at Epic Dietmar Hauser will tell us about his experiences with AI, agents, agentic programming, the singularity and more. You don't want to miss this and the QA session afterwards <3 Want to prepare? Just watch this reddit thread including his recent podcast with Jack <3 https://www.reddit.com/r/gamedev/comments/1syd6eg/a_principal_software_engineer_at_epic_games_25/ https://www.youtube.com/watch?v=PE3aCgSHvTQ **After some announcement we will look at at least 2 games** \* [Black Jacket](https://store.steampowered.com/app/3100370/Black_Jacket/) / [Mipumi](https://mipumi.com/) \* SorcerAI / Oskar Lazar Can‘t wait. The Gamedev Meetup is sponsored by the best Co-Working Space in Town Das Packhaus ( [https://www.daspackhaus.at/](https://www.daspackhaus.at/) ). Cannot wait to see you there Michael ( [https://bsky.app/profile/asebist.bsky.social](https://bsky.app/profile/asebist.bsky.social) )

**Does your LLM speak the same language as you?** *Context, Language & AI in Domain‑Driven Design* Zutaten allein reichen nicht. In Domain‑Driven Design (DDD) entscheiden Kontext, gemeinsame Sprache und Abgrenzung über gute Software – und über sinnvolle Nutzung von LLMs im Unternehmen. In diesem Meetup verbinden wir strategisches DDD, Ubiquitous Language und AI: * Warum Kontext wichtiger ist als Zutaten (erklärt am italienischen Dinner) * Warum gemeinsame Sprache kein Glossar, sondern ein Arbeitsinstrument ist * Wie viel Kontext ein LLM wirklich braucht – und warum unser Team denselben braucht Wir diskutieren LLMs nicht als Ersatz für Zusammenarbeit, sondern als **Verstärker von gutem Domain‑Wissen**. **Agenda** * Quick Intro: Kontext als roter Faden * Strategisches DDD: Zutaten ≠ Lösung * Ubiquitous Language: Sprache als Entscheidungsgrundlage * LLMs im Business: impliziter vs. expliziter Kontext * Diskussion & Q&A **Timeline** 🚪 17:00 Open doors 🎬 17:30 Official start 🍕 19:30 Pizza and Networking \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- **English Version:** Does your LLM speak the same language as you? Context, Language & AI in Domain‑Driven Design Ingredients alone aren't enough. In Domain‑Driven Design (DDD), context, shared language, and clear boundaries determine good software – and the meaningful use of LLMs in an organization. In this meetup, we connect strategic DDD, Ubiquitous Language, and AI: Why context matters more than ingredients (explained through an Italian dinner) Why shared language isn't a glossary, but a working instrument How much context an LLM really needs – and why our team needs the same We discuss LLMs not as a replacement for collaboration, but as an amplifier of good domain knowledge. Agenda Quick Intro: Context as the common thread Strategic DDD: Ingredients ≠ Solution Ubiquitous Language: Language as a basis for decisions LLMs in Business: implicit vs. explicit context Discussion & Q&A \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- 🎤 **Call for Speakers & Sponsors!** Wenn du selbst etwas beitragen möchtest oder eine Idee für einen Talk hast, melde dich gerne bei uns. Wir sind laufend auf der Suche – nicht nur nach Speaker:innen, sondern auch nach neuen Locations für zukünftige Meetups.

**Does your LLM speak the same language as you?** *Context, Language & AI in Domain‑Driven Design* Zutaten allein reichen nicht. In Domain‑Driven Design (DDD) entscheiden Kontext, gemeinsame Sprache und Abgrenzung über gute Software – und über sinnvolle Nutzung von LLMs im Unternehmen. In diesem Meetup verbinden wir strategisches DDD, Ubiquitous Language und AI: * Warum Kontext wichtiger ist als Zutaten (erklärt am italienischen Dinner) * Warum gemeinsame Sprache kein Glossar, sondern ein Arbeitsinstrument ist * Wie viel Kontext ein LLM wirklich braucht – und warum unser Team denselben braucht Wir diskutieren LLMs nicht als Ersatz für Zusammenarbeit, sondern als **Verstärker von gutem Domain‑Wissen**. **Agenda** * Quick Intro: Kontext als roter Faden * Strategisches DDD: Zutaten ≠ Lösung * Ubiquitous Language: Sprache als Entscheidungsgrundlage * LLMs im Business: impliziter vs. expliziter Kontext * Diskussion & Q&A **Timeline** 🚪 17:00 Open doors 🎬 17:30 Official start 🍕 19:30 Pizza and Networking \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- **English Version:** Does your LLM speak the same language as you? Context, Language & AI in Domain‑Driven Design Ingredients alone aren't enough. In Domain‑Driven Design (DDD), context, shared language, and clear boundaries determine good software – and the meaningful use of LLMs in an organization. In this meetup, we connect strategic DDD, Ubiquitous Language, and AI: Why context matters more than ingredients (explained through an Italian dinner) Why shared language isn't a glossary, but a working instrument. How much context an LLM really needs – and why our team needs the same We discuss LLMs not as a replacement for collaboration, but as an amplifier of good domain knowledge. \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- Dieses Meetup ist eine Zusammenarbeit mit dem [DDD Vienna Meetup](https://www.meetup.com/ddd-vienna/events/314052752/?). Anmeldung auf einer von beiden Meetups ist ausreichend. \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- 🎤 **Call for Speakers & Sponsors!** Wenn du selbst etwas beitragen möchtest oder eine Idee für einen Talk hast, melde dich gerne bei uns. Wir sind laufend auf der Suche – nicht nur nach Speaker:innen, sondern auch nach neuen Locations für zukünftige Meetups.

**❗️ 👉 TO THE EVENT:** [Does your LLM speak the same language as you?](https://www.meetup.com/ddd-vienna/events/314052752/?utm_medium=referral&utm_campaign=share-btn_savedevents_share_modal&utm_source=link&utm_version=v2&member_id=357085385)[ ](https://www.meetup.com/java-and-friends/events/313430813/?utm_medium=referral&utm_campaign=share-btn_savedevents_share_modal&utm_source=link&utm_version=v2&member_id=357085385)**❗️** In cooperation with the [Domain-Driven Design Vienna](https://www.meetup.com/ddd-vienna/) Community we are hosting a meetup **at the SQUER Office Vienna.** **👉** Please register on the dedicated [Does your LLM speak the same language as you?](https://www.meetup.com/ddd-vienna/events/314052752/?utm_medium=referral&utm_campaign=share-btn_savedevents_share_modal&utm_source=link&utm_version=v2&member_id=357085385) Page to join us on June 2nd at 5:00 PM 🥳 We are looking forward to seeing you there!

Agenda (preliminary) 18:00 doors open 18:20 welcome 18:30 **A Tour of Ox 1.0: Direct-Style Concurrency and Resiliency** 19:30 break 20:00 **Maybe(!): "Orca: Deterministic, AI-driven development flows"** 20:00 **Maybe(!): "Sandcat: Docker & dev container setup for securely running AI agents"** 21:00 Networking **A Tour of Ox 1.0: Direct-Style Concurrency and Resiliency** Ox provides a toolkit for safe concurrency and resiliency for Scala on the JVM. After two years of prototyping, we’re delighted to showcase the final product. With Ox, you can build and deliver direct-style Scala applications today. In the code-first presentation, we’ll begin with concurrency (including lower-level structured concurrency scopes and higher-level concurrency operators). Next, we’ll proceed to Ox’s approach to error management and type safety in that area. We’ll then explore Ox’s direct-but-reactive streaming library before concluding with its built-in resiliency toolkit. Software is never finished, so we’ll also share what lies ahead for Ox specifically and our plans for direct-style Scala generally. **About Adam Warski** Adam Warski is the co-founder of SoftwareMill and head of R&D at VirtusLab, where he primarily generates code using Java, Scala, Rust and other interesting technologies. He is actively involved in open-source projects, such as Ox, Jox, Tapir, sttp, and others. He has also been a speaker at major conferences, including JavaOne, Devoxx, GeeCON and ScalaDays. In addition to writing closed- and open-source software, he spends his free time exploring various programming-related subjects. Any ideas or insights he gains usually end up on his blog ([https://warski.org/articles](https://warski.org/articles)). **Maybe(!): "Orca: Deterministic, AI-driven development flows"** Orca Flow scripts orchestrate coding agents. No need to try to convince the LLM that reviewing code until all review comments are fixed is a good idea - the script will ensure that's the way it will be done. No need to spend tokens on calling a code formatter, switch branches or creating PRs. Orca Flow scripts are written in Scala, and executable using scala-cli. That's the only component you'll need to install - everything else will be downloaded on-the-fly. Orca Flow scripts read like Python, but are type-safe, so you can know that your script will execute just fine. Orca works with Claude & Codex (now), but the plans are much wider than that! **Maybe(1): "Sandcat: a Docker & dev container setup for securely running AI agents** Sandcat is a Docker & [dev container](https://containers.dev) setup for securely running AI agents. The environment is sandboxed, with controlled network access and transparent secret substitution. All of this is done while retaining the convenience of working in an IDE like VS Code. All container traffic is routed through a transparent [mitmproxy](https://mitmproxy.org/) via WireGuard, capturing HTTP/S, DNS, and all other TCP/UDP traffic without per-tool proxy configuration. A straightforward allow/deny list-based engine controls which network requests go through, and a secret substitution system injects credentials at the proxy level so the container never sees real values.

**Hey everybody!** Do you want to code together, share your projects, or just hang out in a creative atmosphere? Then join us at the **Coding Club @ Jo&Joe Hostel**! We usually start with a short introduction round so everyone can get to know each other. After that, you can: * share your achievements or pet projects (informal, just at the table) * get feedback or inspiration from others * or simply work on your own project alongside the group Bring your laptop (or any device you like to code on) if you want to actively work. Or just come by to connect and get inspired. Please try to be on time so we can kick things off together. Looking forward to seeing you there! 🚀

Let's start our regular meetups again! All yarn crafters (knitters, crocheters, yarn spinner, yarn witches, etc.) and masters of other crafts are invited to come and join us. Let's bring our needles, hooks, yarn and work together on our latest projects while catching up and getting to know each other :) please note that the number of participants on Meetup is limited because not everyone is registering on meetup and registering via our whatsapp group. If you would like to join our group, drop me a line :) All levels are welcome! Whether your a needle ninja or a crochet padawan, you will find here a community to welcome you and help you on your crafting journey!

We have moved to guild.host. Look us up there. https://guild.host/events/buckeye-cocoaheads-rcavwd

Our monthly PHP meetup. A virtual shindig courtesy of Zoom. Check back here for the details around 6:15 pm

**Presenter:** Matthew Hess, Microsoft MVP **Time:** Pizza at 6:00, Presentation Starts at 6:30pm Eastern **Location:** Theoris, 9000 Keystone Crossing, Either Downstairs or in Suite 230 if main meeting room isn't available, Indianapolis In 2019 (C# 8.0) Microsoft introduced a feature that has generated a lot of confusion, debate and outright dissent. I'm talking about Nullable Reference Types. In this presentation, I we dig into this feature, explore why it exists, what problem it tries to solve, how it works, and how people have critiqued it, so that you as a programmer can decide if and how you want to use it. Looking forward to seeing you there!

Come join CORGSCON the Columbus, Ohio retro gaming expo at the Bricker Building – Ohio Expo Center June 6th-7th Saturday: 11am-6pm Saturday After Party: 6PM – 10PM Sunday: 11am-4pm PLEASE NOTE: RSVP for this event does NOT give you access to the event. Please buy tickets for the event on the website here or onsite at the event: [https://www.corgscon.com/tickets/](https://www.corgscon.com/tickets/) We'll have COGG game developers there showcasing their games alongside the [GDEX game expo](https://www.thegdex.com/) also happening later this year. Find out more here: [https://www.corgscon.com/](https://www.corgscon.com/)

Bring your Raspberry Pi, Arduino, microcontroller, or any other electronic project and join fellow electronics makers for a night of creativity and collaboration! This session is open forum to share your current projects—whether complete or in progress, it’s all interesting! Whether you’re deep into embedded systems, exploring new ideas, or just getting started, you’ll find a welcoming space to collaborate, share, and get inspired. **New to electronics or curious about tinkering?** You’re absolutely welcome. If you’re a beginner and want to experiment, I’ll have a couple of starter kits available so you can try things out—whether that’s blinking your first LED, putting something on a display, or experimenting with simple sensors. No pressure and no experience required—just an interest in learning and building. While we continue to pursue a more permanent venue for this Meetup, we’ll be using public library facilities based on availability. This session will be at the Worthington Park Library in the Olentangy Meeting Room.

**Latest Dojo Location!** **Knotty Pine Brewing** 1765 W 3rd Ave, Columbus, OH 43212 We're going to try a new dojo location for a few weeks and see how it works Dojos are informal Python group study sessions where everyone interested in Python gathers to learn about Python, help others with Python, or just hang out. Everyone is welcome from Python beginners to experts. Bringing a laptop is encouraged (we'll have extension cords and power strips). If there's something you want to learn leave a comment on this invite so we can plan ahead. We're looking for speakers for our Monthly Meetups! Fill out the form if you are interested in presenting to the Python Community. https://forms.gle/ehSfUAC2WgR34Crq9