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We are happy to invite you to our next iOS meetup. This time we cooperate with the amazing 42 Berlin to share the knowledge and experience in iOS development. 18:00 Doors open 18:30 Welcome on campus **18:45** **— Sebastian Hagedorn, director of Engineering at Clue, presents "The Sensitive App".** Is your app really working, or just not crashing? “The Sensitive App” reports subtle bugs regardless of origin, and validates your assumptions in production so you don’t have to resort to guessing or praying. Learn how to turn your app into the first line of defense for your entire system’s health! **19:45** **— Dmitry Kurkin, lead Mobile Engineer at SuperNext, presents "Lessons that iOS Native Project could learn from ReactNative in agentic development".** We'll inspect the components of the React Native engine that provide faster feedback and boost agentic iterations.

The longest day of the year is comming and let's another Kotlin meetup. This time we geather at N26! **⚠️⚠️⚠️ Due to a venue policy please submit the following form for additional details. Without it, you won't be allowed inside the venue:** https://forms.gle/XjqVXkD3FARCM6jA8 **Line-Up:** 👉 **TestBalloon: Kotlin testing is easier (and more fun) than you think** *by Oliver Okrongli* You want an easier way to write tests? Parameterize tests in plain Kotlin? Reuse a series of tests? Easily extend own your test setup? Have first-class support on all platforms? All without struggling with a huge framework API? TestBalloon is a new test framework that brings the power of Kotlin to your test setup. With a small-surface API, a hierarchical test structure and an extensible DSL, TestBalloon makes Kotlin testing easy, even at scale. Oliver, the author of TestBalloon, will show testing patterns and strategies and lots of practical examples, ranging from simple unit tests with less boilerplate to advanced testing with coroutines and generated data. This talk is based on insights first presented at KotlinConf 2026 in Munich. At the end of this talk, you’ll be able to firmly the answer the question: "How can I master Kotlin testing with ease, and make my team release with joy and confidence, every time?" 👉 **One Topic to Rule 'Em All** *by Yonatan Karp-Rudin* Kafka delivered every event exactly once, in order, and lost nothing. So what broke? This talk follows that question into the gap most event-driven systems leave open: what actually guarantees the order your domain depends on, and what quietly doesn't. We start from a real log line, find the crack in an architecture that looks clean and ships fast, and rule out the fix everyone reaches for first. The cure turns out to be one sentence of domain thinking plus one line of config, though the Schema Registry will fight you on the way there. A live demo runs the bug and the fix back to back: same load, same hero, one change. If you build with Kafka, you have probably shipped a version of this bug. You will leave able to spot it and fix it before it pages someone. 👉 **TBD** **Speaker Bios:** 🗣 Oliver Okrongli Oliver has been shaping and creating software from backend to frontends. He is the author of TestBalloon, a next-generation Kotlin test framework. Before, he has helped to maintain Kotest, and contributed to several libraries of the Kotlin ecosystem as well as the Kotlin compiler. Can be found on GitHub (OliverO2) and the kotlinlang Slack (Oliver O). When not developing, he is most probably in deep talks, dancing, snowboarding or F18 catamaran sailing whenever he gets a chance. 🗣 Yonatan Karp-Rudin Yonatan Karp-Rudin is a Staff Engineer at Billie, building event-driven systems in Kotlin and Spring Boot. Off the clock, he plays with AI agents and builds random tooling, trying to hand off as much of his own workflow to a machine as he can. The rest of the time he's brewing mead or deep in a video game. **🗣 TBD**

📢 WICHTIG 📢 Diesmal organisieren wir das Treffen draußen, im Tilla-Durieux-Park gegenüber The Playce in Potsdamer Platz. Wir sitzen auf dem Gras, wo der Boden flach ist. Wenn möglich bring bitte Picknickdecken mit.

**Queer Bridges Language Café // Sprachcafé** with ***Michal*** for **LGBTQIA+** **[Free event with registration](https://wearevillage.org/en/shop/language-cafe/w25-2026/)** 🔵 Join us at our Language Café, where you can connect with others and engage in lively conversations. It’s a great opportunity to practice speaking, listening, and even learn some new vocabulary, all while making new friends and having a good time. No matter your level of proficiency, everyone is encouraged to participate and grow together. Come for the conversation, stay for the community! **What languages are represented?** We will have tables for English and German. Beyond that, it will be up to you! We hope to eventually host a wide range of languages and are excited to see this café grow with your support. **What if I don’t feel confident in my language skills?** Our language café is open to everyone, regardless of their language abilities. From beginners to native speakers – we will ensure it is a fun and safe space for everyone. Registration is required as it gives us an idea of how many people to expect and which languages you speak/look forward to practice. However, if you have not registered please feel free to stop by! Join us at our **Language Café**, where you can connect with others and engage in lively conversations. It's a great opportunity to practice speaking, listening, and even learn some new vocabulary, all while making new friends and having a good time. No matter your level of proficiency, everyone is encouraged to participate and grow together. Come for the conversation, stay for the community! *** This meeting is part of our **Queer Bridges** project, aimed at forging connections and providing resources for LGBTQIA+ people with migration experience. *** **General information** * **Language**: This event will be in German and English. * **Registration**: Register on our website by selecting the event, adding it to your cart, and completing checkout. If you have any difficulties registering for the event, you're still welcome to join us, and we will find a solution. * **Cost**: This event is free of charge. 🔵 *Kostenlos mit Anmeldung über unsere Webseite* Kommt zu unserem **Sprachcafé**, wo ihr euch mit anderen austauschen und an lebhaften Gesprächen teilnehmen könnt. Es ist eine großartige Gelegenheit, eure Sprech- und Hörfähigkeiten zu verbessern und neue Wörter zu lernen, während ihr in lockerer Umgebung neue Bekanntschaften knüpft. Egal, wie gut ihr die Sprache könnt, alle sind eingeladen mitzumachen und zusammen zu lernen. Kommt wegen der Gespräche, bleibt wegen der Gemeinschaft! **Welche Sprachen sind vertreten?** Wir werden Tische für Englisch und Deutsch haben. Darüber hinaus liegt es an euch! Wir hoffen, bald viele verschiedene Sprachen anbieten zu können und freuen uns darauf, dieses Café mit eurer Hilfe wachsen zu sehen. **Was, wenn ich mir in meinen Sprachkenntnissen nicht sicher bin?** Unser Sprachcafé ist für alle offen, egal, wie gut ihr die Sprache könnt. Von Anfänger\*innen bis zu Muttersprachler\*innen – wir sorgen dafür, dass es für alle eine lockere und sichere Umgebung ist. *** Dieses Meeting gehört zu unserem **Queer Bridges** Projekt, das darauf abzielt, Verbindungen zu schaffen und Ressourcen für LGBTQIA+ Menschen mit Migrationserfahrung bereitzustellen. *** **Hinweise** * **Sprache**: Dieses Event wird auf Deutsch und Englisch sein. * **Anmeldung**: Melde dich auf unserer Website (für das Event) an, indem du die Veranstaltung auswählst, sie in den Warenkorb legst und dann den Kauf abschließt. Das gilt auch für kostenlose Events. Wenn du irgendwelche Schwierigkeiten hast, dich für eine Veranstaltung anzumelden, kannst du gerne zu uns kommen und wir werden eine Lösung finden. * **Kosten**: Die Teilnahme ist kostenlos.

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!\* \| \| \| \|

Hello friends! We are the team of CaféIN, an inclusive café in Spandau, inviting you to our German language café - Sprach-CaféIN! 😎 With our language café, we aim to create a safe space for everyone to practice real German, without boring grammar exercises and books, but over coffee, conversations and new encounters :) Every person will be warmly welcome at our Sprach-CaféIN, regardless of background and origin. We are happy to see each and everyone of YOU! Our events are not about politics, as we aim to build bridges and bring people together through language and culture. Participation is free, but every participant is **required** to order at least one drink or snack at the café. This helps us support CaféIN and keep this special place alive.

**Online-Nähabend auf Discord – gemeinsam nähen, austauschen und helfen** Hast du Lust auf einen entspannten Online-Nähabend – ganz ohne Kursdruck? Wir treffen uns auf Discord, um gemeinsam zu nähen, zu plaudern und uns gegenseitig zu helfen. Egal ob Anfängerin, Anfänger oder schon fortgeschritten: Alle sind willkommen. Bring einfach dein aktuelles Projekt mit, stelle Fragen oder teile deine Tipps mit der Runde. **Deinen Arbeitsplatz zeigen – optional** Wenn du möchtest, kannst du deinen Arbeitsplatz live zeigen, zum Beispiel über: * Kamera auf Discord (Webcam oder Handy) * Bildschirmfreigabe für Schnittmuster oder Anleitungen am PC * Handy als Kamera von oben auf deinen Tisch **Ablauf des Abends** Ganz locker und ohne festes Ende: * **20:00 Uhr** – Ankommen und kurzer Technik-Check (Ton, Bild, Bildschirmfreigabe) * Kurze Vorstellungsrunde: Woran arbeitest du gerade? Wo brauchst du vielleicht Hilfe? * Danach freies Nähen, Austausch und Fragen zwischendurch * Offenes Ende – wenn du müde wirst, kannst du einfach gehen **Wichtig** Wir starten pünktlich um **20:00 Uhr**. Wer später dazukommt, ist natürlich trotzdem willkommen. Nach dem Start läuft der Abend aber eher frei, deshalb können wir Spätankommende nicht mehr so gut in einen festen Ablauf einbinden. **Technik-Hinweise** * Wir treffen uns in einem Discord-Sprachkanal, auf Wunsch auch mit Video * Wenn du deinen Arbeitsplatz zeigen möchtest, funktioniert die Kombination aus Handy und Laptop meist am besten * Bitte schalte eines der Mikrofone stumm, damit es kein Echo gibt * Kopfhörer sind empfehlenswert * Bildschirmfreigabe klappt meistens am besten in der Discord-Desktop-App, im Browser kann es Einschränkungen geben. **Zeit** **Donnerstag, 20:00 Uhr** **Discord-Zugang** Den Discord-Link bzw. die Kanalinfos poste ich kurz vor Beginn direkt im Event. Er ist für angemeldete Teilnehmende sichtbar.

Das alte T-Shirt mit einem Statement-Print wiederbeleben, eine verlorene Spielfigur nachdrucken oder einen Stempel designen: MeetUp im Humboldt Forum! In diesem dreistündigen Workshop sind alle Interessierten mit und ohne Vorkenntnisse dazu eingeladen, verschiedene Maker Space Technologien kennenzulernen. Wir erklären an unterschiedlichen Terminen (s.u.), wie sich mit Laser Cutter, 3D-Drucker, Schneidplotter, Näh- oder Stickmaschine nützliche Dinge für den Alltag herstellen lassen. Inspiriert von den aktuellen Ausstellungen und Themen des Hauses, können am Laptop mit der Software Inkscape oder Tinkercad eigene Grafiken und Objekte entworfen und gestaltet werden. Wer sich geschickt anstellt, kann am Ende ein fertiges Produkt mit nach Hause nehmen. Die Personenzahl ist begrenzt. Bitte buchen Sie **am Veranstaltungstag an der Tageskasse im Foyer** pro Person ein kostenfreies Teilnahmeticket! Der Workshop ist nicht für Kinder und Jugendliche unter 16 Jahren geeignet. **Die nächsten Termine und Themen:** **Nützliches aus Filz mit der Stickmaschine** 25\. April \(ohne/geringe Vorkenntnisse\) und 2\. Mai \(Fortgeschrittene\) **Pins und Anstecker aus dem 3D-Drucker** 23\. Mai \(ohne/geringe Vorkenntnisse\) und 30\. Mai \(Fortgeschrittene\) **WM-Special: Fan-Trikots selbst gemacht – Bitte T-Shirt mitbringen!** 20\. Juni \(ohne/geringe Vorkenntnisse\) und 27\. Juni \(Fortgeschrittene\) **Weitere Informationen:** Kostenfrei. Bitte buchen Sie Ihr Ticket direkt am Veranstaltungstag an der Tageskasse im Foyer. **Die Ticketbuchung im Voraus und im Webshop ist nicht möglich.** Dauer: 180 min. Ab 16 Jahre. Sprache: Deutsch, Englisch. Rollstuhlgerecht. Ort: Werkräume, 1. OG. Maximal 15 Personen.

Hi everyone, Berlin Lingua Hub’s **Afterwork Cultural Picnic** is back, finally!!! Twice a month, we’ll meet at **Monbijou Park** for a relaxed evening of **good conversations, new connections, and cultural exchange**. **What’s the idea?** We keep it simple: **bring your favorite drinks or snacks**, enjoy a laid-back picnic, and connect with people from all over the world. Whether you’re new in Berlin or have been here for years, this is a great way to meet interesting people in a relaxed atmosphere. **What about languages?** This is not a structured Sprachcafé, but since Berlin Lingua Hub is all about languages and cultural exchange, you’ll naturally find people speaking different languages. Feel free to practice, mix languages, or simply enjoy great conversations in any language you’re comfortable with. **When & Where?** 📍 **Monbijou Park** – Meeting point is at the west right corner of the park, alongside the Oranienburger Str. You'll see some Berlin Lingua Hub signs. 🕡 **From 18:00 onwards** – open-end, stay as long as you like Since this is an **outdoor event**, it’s **weather-dependent**. If any changes happen, we’ll update you on the same day. Looking forward to welcoming you all for **a great mix of cultures, languages, and good vibes!** If you're lost, contact Chris! He'll be happy to help you find the place :) **See you soon!** Nacho

The Creative Code Jam is a monthly gathering of artists, makers, designers, illustrators, coders, musicians, performers, learners and anyone interested in the use of computing skills for artistic expression. The event is free and open to all, regardless of age, origin, gender or experience. The jam is an opportunity to meet likeminded people and get creative together in a relaxed and safe environment. Beginners and first-timers should feel especially welcome! WHAT SHOULD I EXPECT? **Bring a laptop** and/or anything you’d like to work on, whether it’s a personal project, an experiment, or a skill you want to learn. You can come with friends or meet new people here. There’s no set agenda: some people code, some sketch ideas, some collaborate, and others just chat and get inspired. SCHEDULE Doors open at noon, then we’ll have quick introductions so everyone can share what they’re planning to work on. Note: arriving on time is the best way to hear what others are up to ;) Around 6 pm, we gather to share what we’ve worked on during the day. BEGINNERS WELCOME! If you’re new to creative coding, we'll be happy to help you get started, and you can find beginner-friendly resources at [creativecode.berlin/learn](http://creativecode.berlin/learn). THIS IS YOUR SPACE We do our best to create a welcoming environment for all people regardless of race, ethnicity, color, religion, gender identity, sexual orientation, national origin, age, disability, or genetics. People from group generally underrepresented in open-source, art, and technology fields are warmly encouraged to come by. And if you know someone who might enjoy this meetup but isn’t sure it’s for them, let them know they’ll be welcome! SAFE SPACE POLICY We support the Berlin Code of Conduct: https://berlincodeofconduct.org/ Please make sure you agree with its content. ABOUT MotionLab.Berlin MotionLab.Berlin is Germany’s premier Innovation Hub & Makerspace – an ecosystem for Hardtech, art, creativity, and entrepreneurship. They are an international community with access to state-of-the-art machinery, prototyping machines, coworking spaces, offices, and production facilities. More info: https://motionlab.berlin/ ACCESSIBILITY MotionLab is located on the ground floor, with bathrooms on that same level, although unfortunately they are too small for wheelchairs. FOOD MotionLab has drinks and snacks for sale. Bio food can be found on LPG at Bouchéstr (\~200m). Their cantine has vegan, vegetarian and other food options until 8pm. DO I NEED TO SPEAK GERMAN? We speak mostly English so international guests are more than welcome! Our team also speaks French, Turkish, Italian, Spanish, Dutch, Finnish and German... though language availability may vary depending on which organizers are present :) CONTACT Raphaël de Courville team@creativecode.berlin +49 176 700 70572 or get in touch via [creativecode.berlin](https://creativecode.berlin/)

Join Us for a Morning Swim at Humboldthain Outdoor Pool! Hey everyone, We are doing another relaxed swim meet-up at Humboldthain outdoor swimming pool, and I'd love for you to join! We'll be gathering for a casual 30-minute swim - nothing competitive, just a chance to enjoy the water and start the day on a refreshing note. Afterwards, if you're up for it, we can go to a nearby cafe for a coffee and chat, but no pressure - totally optional! 📝 **Bring** - ID/passport (mandatory, checked by the pool staff) !!! - swimsuit - towel - 1 Euro coin (for a locker) - ticket is around €5.50 (buy online or at the pool) **RSVP** Please un-RSVP ❌ if you cannot come! Otherwise we would unnecessarily wait for people to never show up. 📍**Where** At the pool entrance (see the map pin) and wait for 15 min for people to gather. You need to enter Humboldthain park. 🎟 **Pool tickets** [https://www.berlinerbaeder.de/baeder/detail/sommerbad-humboldthain/](https://www.berlinerbaeder.de/baeder/detail/sommerbad-humboldthain/) ☕ **Coffee** A wonderful coffee shop a few minutes away from the pool [https://maps.app.goo.gl/os3WHTSfYzbDyKQh7?g_st=ac](https://maps.app.goo.gl/os3WHTSfYzbDyKQh7?g_st=ac) Looking forward to seeing you there!

At OpenSpace Networthing entrepreneurs from diverse disciplines, industries and nations meet to collaboratively develop solutions for challenges presented by participants. This month we will dive deeper into building digital products with Vibe Coding & AI with Varun Jain. We are building a networking-App: The "Tinder for Entrepreneurs" If you want to offer a workshop or present a topic for our members, write an email to alejandro.wagner@mlp.de Entrance is free! Bring in your expertise instead.

Summer is here! Time for our first outdoor meeting of the season! Back to Treptower Park, Karpenteich. Bring something to sit on and any food, drinks or substances you might need. Everyone welcome. No prior experience required. No obligation to consume anything, but please nothing illegal at the event :-)

Welcome to Drunken Philosophy, a casual, curious, social discussion club. Come grab a drink and a seat at The Oracle. **Optional topic for this meetup: Where is everybody?** In 1950 the physicist Enrico Fermi was talking about aliens over lunch and asked a question that still has not gone away: if the universe is so vast and so old, and even a fraction of those billions of stars have planets, where is everyone? By the numbers the galaxy should be crowded with civilizations. Instead we look up and hear silence. That gap between "they should be everywhere" and "we see no one" is the Fermi Paradox. One of the most unsettling answers is the idea of a **Great Filter**: somewhere on the road from dead chemistry to a galaxy-spanning civilization, there is at least one step that is almost impossible to get past. Maybe the filter is behind us. Maybe life starting at all, or simple cells becoming complex, or intelligence ever evolving, is the freak accident, and we already cleared the hard part. Or maybe the filter is ahead of us, and advanced civilizations reliably wipe themselves out before they spread. Here is the part that messes with people. If we ever found life somewhere else, even pond scum on Mars, most people would call it the greatest discovery in history. But it might be the worst possible news. It would mean life is common, the early steps are easy, and the hard step is still in front of us. So the eerie silence overhead might actually be the best sign we could ask for. **Questions to wrestle with:** * Is it better to be alone? Would you rather we find alien life and learn we are not special, or find nothing and quietly improve our odds of surviving? * Where do you bet the filter sits, behind us or ahead of us, and why? * If it is ahead of us, what is it? Nuclear war, climate collapse, AI, something we cannot even picture yet? And can we do anything about a filter we cannot see coming? * Two principles pull opposite ways here. The principle of mediocrity (the Copernican principle, Sagan's "no privileged place in the universe") says we are ordinary, so what happened on Earth probably happened everywhere, which makes the silence scream louder. The anthropic principle says of course we find ourselves somewhere life was possible, since we could not observe anything else, so our being here may say almost nothing about how common life is. Which lens do you trust, and does the silence still demand an answer once you account for observer selection? * And if we did confirm life out there and had to accept we are not special, what would that do to belief in a higher power, and would shedding (or keeping) that belief help or hurt our odds of pulling together as one species? * Does any of this change how you live, or how humanity should be spending its time and money right now? As always the prompt is optional. Come for the conversation, stay for the drinks, and bring your own questions.

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!

**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

**Improving Office in Franklinton** Physical location: Improving Office 330 Rush Alley Suite #150 Columbus, OH 43215 Schedule: 6:00 p.m.: Socialize, eat, and drink. Improving will be providing pizza and beverages. 6:30 to 8:00 pm. Main meeting and presentation(s). Topic: This month Chris Pazsint will be talking about Agentic Coding. How does one use CLI Based Agents, and Agentic IDEs such as Cursor, Kiro, Antigravity? How to include agentic coding plugins for IDEs you already love such as Visual Studio Code. We meet on the last Monday of each Month. Presentations are given by members and friends of this group. If you would like to do a presentation (small or large) on a python topic, please contact Central OH Python at centralohpython@gmail.com

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/).

**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

We are going to build together with all the CLIs! E will be doing it at Columbus Code and Coffee Agenda --- Hosted By James Power, Organizer Pete Gordon, Organizer Just a Software Guy in the age of the Internet. Complete your event RSVP here: https://gdg.community.dev/events/details/google-gdg-columbus-presents-ai-improv-lets-build-a-game-together-with-claude-code-codex-and-gemini-and-be-the-judge/.