C#

We are back in the c-base! Do you already run NixOS and want to talk to other people or want an introductory session with some NixOS users. Just bring your machine! Usually there are no topics, we just sit in front of our computers, talk about stuff, debug some problems or review some PRs on nixpkgs. There are drinks usually available from the c-base bar. If you can't find us. just ask around or ask in irc (#krebs on hackint)

Together with Capgemini, we’d like to invite you to our talk in June. This time, we’ll be discussing spec-driven development with Simon Martinelli. **Spec-Driven Development in Practice: How AI Simplify Full-Stack Java** AI is transforming how we develop software, but many teams still treat code as the source of truth, leading to outdated documentation and hidden business logic. What if specifications became the single source of truth instead? This session introduces Spec-Driven Development (SDD) and the AI Unified Process (AIUP), a practical approach in which developers write clear, structured requirements, and AI generates everything else: diagrams, code, and tests. When requirements change, the system stays consistent automatically. Based on a real-world Java project built with Spring Boot, jOOQ, and Vaadin, the most productive and secure web framework for Java, you’ll see how SDD keeps business rules, data access, and UI perfectly aligned. Join this session to learn how AIUP helps Java developers deliver applications faster, with less boilerplate and more focus on what really matters: understanding the domain. Most teams still treat code as the source of truth, leading to outdated documentation and hidden business logic. In this session, you’ll learn how Spec-Driven Development (SDD) and the AI Unified Process (AIUP) let you define requirements once and generate consistent Java code, diagrams, and tests automatically. Based on a real project with Spring Boot, jOOQ, and Vaadin, this talk shows how to build faster, safer, and more maintainable full-stack Java applications. **Simon Martinelli** Simon Martinelli is a Java Champion, Vaadin Champion, and Oracle ACE Pro with over three decades of experience as a software architect, developer, consultant, and trainer. He is the creator of the AI Unified Process (AIUP) and a strong advocate of Spec-Driven Development. As the owner of Martinelli LLC, he coaches teams to get up to speed with AI-driven development. He regularly shares his insights through international conferences, articles, and his blog, Keep IT Simple (https://martinelli.ch), where he writes about AI, architecture, and modern Java development. He is also a lecturer at two universities in Switzerland, where he teaches software architecture, persistence, DevOps, and cloud-native development.

**We switched away from Meetup for organizing this event!** Right now, you have a couple of options, because we're still trying to find the best alternative. Please go to one of the following event pages, instead, and let us know, which one you'd prefer and for what reason! Help us find the best way to organize the event while supporting Free and Open Source software! \ *[lu.ma/vuejs_berlin](https://lu.ma/vuejs_berlin) \- not open\, unfortunately \* [openmeet.net/groups/vuejs-berlin](https://openmeet.net/groups/vuejs-berlin) \- open alternative that supports atproto \ *[roomy.space/vuejs.berlin](https://roomy.space/vuejs.berlin/) \- open community chat linked to OpenMeet

In diesem Kurs beschäftigen wir uns mit verschiedenen Texten aus unterschiedlichen Bereichen. Das können u.a. kurze Geschichten, Gedichte, Zeitungsartikel, Kolumnen oder Videos sein. Immer sind es Themen, die uns gefallen, die wir besonders interessant, wichtig oder manchmal auch richtig schlecht finden. Gemeinsam versuchen wir die Position der Autor*in, den Stil und die Argumentationsstruktur zu verstehen. Dazu diskutieren wir über das, was wir verstehen, welche Meinung wir zu dem Thema haben oder welche Fragen offen bleiben.
Gerne könnt ihr uns auch Themenvorschläge mitbringen oder zuschicken.
Der Kurs richtet sich an interessierte Menschen mit einem B2-Niveau (oder so ähnlich), die Lust haben sich weiter mit der deutschen Sprache zu beschäftigen und ihren Wortschatz zu erweitern.
Die Termine sind sporadisch.

​Informal meetup for people interested in OpenClaw and AI agents. We share what works/what doesn't and what we’re currently trying. Feel free to bring your laptop and half-working setup. We're all here to learn how to ride the tiger \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- ​Events usually unfold in two parts: 1st part - People showcase projects, tools, setups and discuss learnings 2nd part - Open discussion/networking

**8 WEEKS CLASS FOR BEGINNERS** **FROM BASIC SHAPES TO FIGURE** with live model **MATERIAL INCLUDED!** [BOOK IT HERE](https://berlinschoolofdrawing.weebly.com/2-months-class-on-drawing.html) TUE. 5 TO 7 PM from APRIL 21st to June 23rd 2026 8 classes of 2 hours ( no class on MAY 5 and 26th ) 210€ IN TOTAL 35€ drop in option Included in the price: ALL MATERIALS PROGRAM: The aim of this course is to learn and deepen the basic skills of drawing and figure drawing. Students will learn the fundamentals of drawing through observation, instinct, and traditional methods in a winning combination. Focus will be on the main points of traditional drawing, such as structure, volume, shading, framing and composition as well as the human figure. Through a step by step program, you will learn how to bring what you see onto paper and how to finish with a completed chiaroscuro drawing. These skills are an essential foundation for further personal artistic exploration. MAIN POINTS OF THE CLASSES: • how to draw what we see • how to see lines and volume • proportions and shapes • how to do shading / chiaroscuro • how to use materials • how to sketch and define figures • work on different pose's lenght • how to apply all that you learn **DETAILED PROGRAM OF THE CLASS ON THE** [WEBSITE](https://berlinschoolofdrawing.weebly.com/2-months-class-on-drawing.html)

Welcome to our cosy Godot Engine Community Meetup! This is not a structured meeting, but rather a friendly get-together. We will hang out, chat and maybe show some of our current projects! 🦜 Regardless if you are an artist, designer, programmer, beginner, hobbyist, professional or anything in between: join us for sharing knowledge, creating art together, coding together, joining game jams together and having fun! 🌼 This meetup will happen at [c-base](https://c-base.org), Rungestraße 20, 10179 Berlin. 🛰️ You can also join us on [our Discord Server](https://discord.gg/Sm3CgrqqQa). ☎️ Follow us on [Mastodon](https://mastodon.gamedev.place/@GodotUserGroupBerlin) for updates. 📢 Also check out [our website](https://godot.berlin). 🌐 Please be [excellent to each other](https://godotengine.org/code-of-conduct/)! 🕊️

👋 Hallo und 💜-lich Willkommen to the Elixir Berlin Meetup. After a break because all of the bank holidays in May, we are back with the **"happy b10000 birthday, bitcrowd"** edition, since its 16 years when bitcrowd was founded. There's gonna be some modest celebration and some great talks. There is even one free slot still available! If you're new to the community the best way to introduce yourself is [to submit a talk](https://github.com/elixir-berlin/planning/issues/new?template=talk.yml) ⏰ Schedule 18:45: Doors open 19:05: Welcome & Announcements 19:15: 🗣 "Famous last words: Let's build a custom solution" by Agathe 19:45: 🍺 break 🍵🧃 20:15: 🗣 TBA 20:45: ⚡️ Lightning talks and socializing, and a bit of celebration We want to encourage members of the Elixir community to share what they're working on. If you want to give a lightning talk at this Meetup, contact one of the organizers with a short description of your talk - or [submit a talk](https://github.com/elixir-berlin/planning/issues/new?template=talk.yml) See you all there 💜💜💜

**Rust Berlin on location 🏳️‍🌈** is a new, informal in-person Rust meetup group in Berlin. We are a interactive meetup format interested in mob coding, deep diving and problem solving together. We build toy projects, share experiences, discuss technology and learn new cool stuff. And you are welcome to join! No matter if you are writing Rust production code every day, if you already contribute to Open Source projects or want to start doing so, if you use Rust in hobby projects or if you are just curious what the hype and buzz is all about, you are very welcome! To coordinate and plan activities, please join our **[Rust Berlin on location 🏳️‍🌈](https://rust-berlin.zulipchat.com/join/gap4pdbz7xsquliiz7tgcyuk/)**[ Zulip chat](https://rust-berlin.zulipchat.com/join/gap4pdbz7xsquliiz7tgcyuk/)! **Planned programme** Being an informal meetup, we are open to anything between just meet and talk, explore nerd snipes and rabbit holes, mob code together, plan and build fun projects, tinker with electronics, and presentations with Q&A. With the [introduction](https://berline.rs/2026/04/01/berlin-talks.html) of the new [Rust Berlin Talks](https://berline.rs/about#rust-berlin-talks) meetup series, **[Rust Berlin on location 🏳️‍🌈](https://berline.rs/about#rust-berlin-on-location)** strengthens its focus on social community experience, the exchange of knowledge, ideas and perspectives, and the joy of spontaneity. This time, Florian Gilcher will give a small **workshop on structured and safe usage of *\`unsafe\`***. We will look at some common use-cases and how common hazards can be avoided. Anyone is invited to bring their projects and questions, show something, ask something, or explore a topic together. The best conversations and deepest rabbit holes can emerge out of seemingly nowhere. **Projected upcoming meetups** We schedule regular meetups on Thursday evening every four weeks, using the slot between the Berlin Rust Hack and Learn online meetup (every two weeks), and the Rust Nuremberg online meetup (every four weeks). 11 June 2026 is our fourteenth meeting Our next projected meetings are going to occur on the following dates: * 9 Jul 2026 * 6 Aug 2026 * 3 Sep 2026 * 1 Oct 2026 * 29 Oct 2026 * 26 Nov 2026 **Location** Our meetup location is the new shared office community space of Ferrous Systems, Slint and KDAB in Berlin Mitte, for up to 25 people. We are expecting to use this space as our default location for the time being, with the IN-Berlin e.V. community space in Moabit as backup. Regardless, as our group might eventually outgrow the locations' size limit, we are low-key looking for bigger locations. If you know a fitting location, then please let us know in our Signal group! Another workable way might be to split the meetup into smaller, interest-specific sub-groups instead. As the no-show rate on Meetup.com is rather high, consider showing up even if you are on the waiting list. We can't promise that there is any space left, but usually there is. So give it a shot! **Accessibility** The location has an elevator and a wheelchair accessible bathroom. Please note that the bathroom is two floors down from the meetup space. On our quest for a bigger location, we are going to pay special attention to accessibility. **Community** We aim to create a safe place for everyone and adhere to the [Berlin Code of Conduct](https://berlincodeofconduct.org/). Inclusivity is very important to us. If you are curious about Rust, but unsure if you are welcome to join: Yes, yes you are. Please come to the meetup! If you have special needs, please get in contact, we will try to accommodate you as best we can. We are part of [https://berline.rs/](https://berline.rs/) and like to hang out in the **[Rust Berlin on location 🏳️‍🌈](https://rust-berlin.zulipchat.com/join/gap4pdbz7xsquliiz7tgcyuk/)**[ Zulip chat](https://rust-berlin.zulipchat.com/join/gap4pdbz7xsquliiz7tgcyuk/). You are very welcome to join!

The Language Café is primarily aimed at people who are struggling with their mental health which can make it hard to go to regular courses. We want to create a safe space for everyone to learn and practise without pressure. Everyone is welcome! Please try to be on time so we can all get started together :) We mainly practise on a beginner/lower intermediate level and adapt to everyone's prior level of German. The Language Café will focus on teaching you the most important words and phrases and basic grammar in German. The content of the course is adapted to real life. (everyday life in Germany, dealing with authorities, etc.) We will cover different topics every week and you can join us anytime, since the topics do not necessarily build on each other. The Sprachcafé is for free. \*If you cannot make it please cancel your participation so someone else from the waiting list can join, thank you!\* \| \| \| \|

Du möchtest dein Deutsch (Niveau **A1 bis B1**) in entspannter Atmosphäre üben und neue Leute kennenlernen? Dann komm zu unserem regelmäßigen Sprachcafé ans Goethe-Institut Berlin! In unserem sonnigen Hinterhof sind alle herzlich willkommen – ganz besonders internationale Teilnehmende, die spielerisch und ohne Druck ihre Deutschkenntnisse verbessern möchten. In lockeren Gesprächsrunden tauschen wir uns aus, lachen zusammen und knüpfen neue Kontakte. Für eine gemütliche Stimmung sorgen Kaffee, Tee und Kekse – du musst nur dich selbst mitbringen. Die Veranstaltung ist kostenfrei! Voraussetzung: Deutschkenntnisse auf dem Niveau A1 bis B1 Wir freuen uns auf dich! 🌍

**We’ll now be meeting twice a week at Denizen House (Köpenicker Str. 40, 10179 Berlin), on** **Mondays and Wednesdays!** * **Mondays:** **levels A1 to B2** * **Wednesdays:** **levels A2 to C1** **We work with dedicated materials tailored to each level, so everyone will have a place to practice and improve.** **Event schedule** * **18:00 – 18:30** **Arrival and registration** * **18:30 – 19:50** **Sprachcafé** * **19:50 – 20:00** **End and clean up** **Please be aware that the moderated event starts at** **18:30. Before this time, we are busy setting up the space. Registrations usually take place around** **18:15 / 18:20. Participants are kindly asked** **not to arrive too far in advance** **at the house.** **If someone arrives much earlier, Denizen may ask them to pay either for a drink (consumption) or for a** **day pass, as the space is a co-working environment during the day.** **Please remember, our event is only happening from 18:00 to 20:00** **How the Sprachcafé works** **We use different materials to help participants gain confidence in German. Together with whiteboards and our volunteers, the Sprachcafé is based on** **interactive conversations** **in small groups.** **Participation fee** **The Sprachcafé has a** **participation fee of 5 €, which helps cover organizational costs and** **includes one soft drink for free.** **Tickets can be purchased directly on the day of the event, card and cash payments are accepted.** **As the Sprachcafé has become very popular, we now need to** **limit the number of participants. Please understand this measure; it ensures that everyone has a comfortable space to practice.** **We kindly ask you to be** **rücksichtsvoll** **and only RSVP “Yes” if you are certain you can attend.** **If your plans change at the last minute, please update your RSVP so someone on the waiting list can take your spot.** **Getting your ticket early can help secure your place.** **Please note** **Our event will begin** **promptly** **at the scheduled start time.** **If you arrive late, we cannot guarantee your participation, even if you have a ticket or have RSVP’d. We encourage all guests to arrive on time to ensure a smooth and enjoyable experience for everyone. Thank you for your understanding and cooperation.** **About Denizen** **Denizen is a new-style co-working space focused on being an integral part of local communities. Located on the ground floor of the historic Eiswerk on Köpenicker Straße in Kreuzberg, Denizen House is a communal place providing work, refreshment, and recreational facilities throughout the day. Think of it as a living room for the neighborhood.** **If you have any questions, don’t hesitate to let me know. If you’d like to contribute to this night, send me a message!** **Ich freue mich schon!** **Grüße,** **Nacho**

Hello fellow Symfonians, we are thrilled to announce something we've never done before: a **Live Code Review** session! This time it's not about slides and talks – it's about your code. Submit a snippet beforehand and we'll review it together as a group, live on stage. Expect honest feedback, fresh perspectives, and plenty of "ah, that's how you could do it" moments. This time we are hosted by **c-base** (Rungestrasse 20 10179 Berlin). Come by and enjoy an evening of learning, networking, and socializing with fellow Symfony and PHP developers. **Agenda:** 18:30: Doors open 19:00: Welcome and Introduction 19:20: **Part 1: "Live Code Review - Bring Your Own Code"** **by Stefan Priebsch & Sebastian Bergmann** 19:50: Break & Snack 20:00: **Part 2: "Live Code Review - Bring Your Own Code"** **by Stefan Priebsch & Sebastian Bergmann** 20:40: Socializing **Event Details:** **"Live Code Review - Bring Your Own Code"** by Stefan Priebsch & Sebastian Bergmann When Sebastian Bergmann and Stefan Priebsch take the stage together, expect an evening focused not on theory, but on the craft of building good software. As founders of [thePHP.cc,](http://thePHP.cc,) they have influenced the conversation around code quality, testability, refactoring, and sustainable architecture in the PHP community for many years. At this Symfony User Group meeting, they bring that experience to a special format: a public code review of code submitted by attendees. Together, they will look at real-world examples from everyday development, share direct feedback on structure, readability, testability, and maintainability, and show how even long-lived codebases can be improved step by step. This is a great opportunity to see how experienced practitioners approach code, which common issues they spot quickly, and which improvements can have the biggest impact in practice. If you would like feedback on your own code, bring it along. Please make sure to remove any credentials or personal data before sharing it publicly. The feedback will be constructive, respectful, and focused entirely on improving the code. Don't miss this insightful event, engaging discussions, and networking opportunities. We can't wait to see you at the June Symfony User Group! If you have any questions or accessibility requirements, please reach out to us. Also, if your company wants to be the next host for the User Group, just let us know!

**Important time note:** Please plan on arriving between 5:30 and 6:00 as the elevators lock after 6 and you'll need to message us and we'll need to come get you. The building address is 4450 Bridge Park The entrance is 6620 Mooney St, Suite 400 You will need to scan your ID at the door to get a visitor badge. **Abstract** *Customize the IDE: Building Extensions for Visual Studio Code* Visual Studio Code is one of the most widely used development environments today, and much of its flexibility comes from its extension ecosystem. Extensions allow developers to customize the editor with new features, integrations, and workflow improvements tailored to their needs. In this session, we’ll cover what extensions are and the different types available, including full extensions written in TypeScript or JavaScript, along with lighter-weight extensions such as color themes, language packs, language support, code snippets, and keymaps. We’ll also look at practical reasons a developer might create an extension, from automating repetitive tasks to adding custom tooling. The session includes a hands-on walkthrough of creating a new extension, testing it locally, and understanding the basic project structure. We’ll close with a brief overview of how extensions are packaged and published to the Visual Studio Marketplace and other distribution options. **YouTube Link** TBD

**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!

We are bringing Microsoft Build sessions to Columbus Ohio! The Central Ohio Azure Meetup and Central Ohio .NET Developer's Group (CONDG) are coming together to bring some of the labs and breakouts from Microsoft Build to your backyard. In this free, 1 day event, you are going to Build stuff with us! And yes, there will be free food. Please RSVP via [Microsoft Build //localhost:columbus | Microsoft Reactor](https://developer.microsoft.com/en-us/reactor/events/27247/).

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

A session on using Claude Code, Anthropic's AI coding agent, in real Unity development. We'll cover what coding agents are, where Claude Code fits, and how to apply it to an actual game project. The format is presentation-style, with live demos and time for questions throughout. After brief scene-setting on coding agents and what makes Claude Code distinct, we'll go problem-driven: demoing it live on a released Unity game and introducing each feature as a solution to a problem we hit. What to Expect: * An intro to coding agents and where Claude Code fits * A live demo on a real Unity project * Key features as solutions to real problems: 𝖢𝖫𝖠𝖴𝖣𝖤.𝗆𝖽, context management, hooks, skills, subagents, and MCP * Unity-specific pain points, including Domain Reload and MCP caveats * Putting it together All experience levels welcome. Food and drinks provided. *Note: meetup topics may change — check back for the latest details.*

We've moved to guild.host Look for us there. https://guild.host/events/buckeye-cocoaheads-nscoders-tcbrk5

Columbus Code & Coffee is an inclusive, informal co-working session. People of all skill levels attend, and we love it that way. Many people (optionally) bring projects to work on, and many other people (optionally) socialize the entire time. It's entirely up to you! **What to Expect at the Intro Circle** \~\~\~\~\~\~\~\~\~\~\~\~\~ Near the beginning of the event (1:30 pm), we do a standup: * Organizer announcements, updates, and logistics Round 1 - (7 secs max): * Your name * What you're working on * What you can help others with Round 2: * Community events you wanna plug. If none, that's cool too. Round 3: * Job opportunities you're hiring for OR announce that you are looking for one. If none, that's cool. After the introduction circle, everything is self-organized! Feel free to work alone, pair up, attend one of our workshops/presentations, or mingle!