Smalltalk

While we are approaching the middle of the year and KotlinConf is just over - we are thrilled that Trade Republic hosts us again! So mark the date! **Line-Up:** 👉 **Lists, Sequences, and Flows: Scaling Data Processing in Kotlin without Melting Your Memory.** *by Daniela Valero* In this talk, Daniela shares her journey of meeting a major backend deadline while managing a data pipeline's memory footprint. You’ll learn how to transition from eager List operations to lazy Kotlin Sequences and jOOQ Streams (using database fetchSize chunking) to keep memory usage flat. Finally, we’ll explore using Kotlin Coroutines and Flow to introduce safe concurrency so your data processes quickly without straining your database. 👉 **The show must go on** Kotlin-based Kafka dead-lettering solution without external (system) dependencies *by Blagoja "Baki" Stamatovski* **👉 Job Market Insights from a Kotlin developer** *by* Ivan Gafurov **Speaker Bios:** 🗣 **TDB**

You are warmly invited to our next Omega Talk: **HOLLOW EARTH –** ***A Forgotten Cosmology Reconsidered*** For centuries, we have been taught to see Earth as a solid sphere. Yet another possibility continues to appear like a forgotten echo: What if Earth is not as solid as we think? What if beneath the surface lies a vast, hidden world? In this Omega Talk, we will explore the fascinating and controversial idea of the Hollow Earth — a forgotten cosmology that invites us to look beyond conventional models and reconsider ancient knowledge, polar mysteries, seismic questions, the idea of an inner sun, and the possibility of Earth as a living, breathing planetary being. This evening is not about blindly accepting a theory: It is an invitation to curiosity, open inquiry, and expanded perception. Join us for a jorney beneath the surface — could earth be more mysterious, more alive, and more multidimensional than we have taught to believe? After the presentation, there will be time to create a warm space for reflection, connection and friendship over tea and snacks. I look forward to welcoming you 😊

**The TypeScript Berlin meetup is back!** After a long break, we're reviving the meetups for 2026 and we'd love to see you there. Whether you've joined us before or you're coming for the first time, welcome! Come round for talks, snacks, good conversations, and a chance to connect with other TypeScript devs in Berlin. *** **🎙️ Interested in speaking?** We have an ongoing call for speakers for this event as well as future ones. [Fill it out here](https://tally.so/r/jaGa1J). *** **📅 Schedule** * 18:30 - Doors open, drinks and snacks 🍕 * 19:00 – Welcome 🤝 * 19:05 - Talk 1: "**Type-Driven Architecture: Stop Validating, Start Designing**" by [Mahesh Haldar](http://in.linkedin.com/in/haldarmahesh) 🎙 * 19:35 - Talk 2: "**Soundness holes in TypeScript’s type system**" by [Alexey Orlenko](https://www.linkedin.com/in/oleksiiorlenko/) 🎙 * 19:50 - Break 🥤 * 20:05 - Talk 3: "**Prisma Next: AI-Native, Graph Migrations, Extensions & Middleware**" by [Will Madden](https://www.linkedin.com/in/willmadden/) 🎙 * 20:35 - Talk 4: "**Prisma Next Performance**" by [Serhii Tatarintsev](https://www.linkedin.com/in/sevinf/) 🎙 * 20:50 - Wrap-up * 21:00 - Doors close 👋 *** This meetup is organised by [Prisma](https://www.prisma.io/). By attending the event, you agree to abide by our [Code of Conduct](https://www.prisma.io/event-code-of-conduct). For questions, reach out to events@prisma.io

Join us for the **Data Berlin Meetup**, an evening of talks, insights, and networking for the data community in Berlin. RSVP on Luma at https://luma.com/s9868ww4. **Agenda** **6:30 PM – 7:00 PM** — Registration and Networking **7:00 PM – 7:10 PM** — Welcome and Opening Remarks — Data Berlin Meetup Team **7:10 PM – 7:35 PM — Rewiring the Engine: Taming Billions of Audience Data at Scale** **Speaker:** [Adedeji Rodemade](https://www.linkedin.com/in/adedeji-rodemade/), Team Lead Data Analytics Engineering **7:35 PM – 7:40 PM — Short Break** **7:40 PM – 8:05 PM — Creating a Parallel Universe: How We Evaluate The Impact of Ad Campaigns in the Physical World** **Speaker:** [Majid Mostafavi](https://www.linkedin.com/in/majid-mostafavi/), Team Lead Data Science **8:05 PM – 8:30 PM — From Snaps to Footsteps: Experiments for Measuring Offline Impact** **Speaker:** [Mihaela Tsankova](https://www.linkedin.com/in/mihaela-tsankova-48560453/), Group Manager, Marketing Science at Snap **8:30 PM – 9:30 PM — Closing Remarks and Extended Networking** **About our host** **[Adsquare](https://www.adsquare.com/?utm_source=luma)** helps brands connect people and places in a **privacy-first** world with **location intelligence** — data and tools for planning, activation, measurement, and attribution across digital marketing and drive-to-store campaigns. **Looking for a job?** Browse data & AI roles in Berlin (updated daily): [databerlin.net/jobs](https://databerlin.net/jobs) **Want updates or more info?** Subscribe to our newsletter: [databerlin.substack.com](https://databerlin.substack.com). Follow us on [LinkedIn](https://www.linkedin.com/company/data-berlin?utm_source=luma). Join our [Slack community](https://join.slack.com/t/data-brln/shared_invite/zt-2ued0xvdu-aihzi2cKEwD_6_KDRd_1ag?utm_source=luma).

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 [Saftladen Game Collective](https://saftladen.berlin), Normannenstraße 1-2, 10367 Berlin-Lichtenberg. 🌳 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/)! 🕊️

Join us for an exclusive first listen to Tarja Turunen’s highly anticipated tenth solo studio album, Frisson Noir! Tarja has officially dubbed this her ultimate "return to metal" and the heaviest album of her entire career. We will go to Halford to hear the tracks in full before the official worldwide release on June 12th. Whether you've been following her symphonic metal origins with Nightwish for years or just want to appreciate some powerhouse vocals with good company, it's going to be an epic night out. Let’s grab a drink, meet fellow metal fans, and experience the new era of Tarja together. See you there!

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!\* \| \| \| \|

**Relax. Connect. Create. ☕** After a full week of work, meetings, study sessions and life in fast-forward, it’s time to slow down. Join us this Saturday afternoon in Berlin for a relaxed coffee hang-out where this week's agenda is good company & warm drinks. You're also invited to bring some boardgames, drawing/coloring materials (I will bring an adult coloring book) **What’s the plan?** We’ll meet in a cosy spot, draw, chat about everything and nothing, swap stories and simply enjoy the moment. No pressure. No formalities. Just a bunch of friendly people sharing a Saturday coffee. **Who’s welcome?** Everyone! Whether you’re a Berliner born and raised, newly arrived in the city, from Germany or abroad, if you like meeting open-minded folks and spending some relaxed time—come join us. **When & how?** Saturday afternoon. Detailed time and place in our Telegram group. ➡️ Join us on Telegram: [https://t.me/berlinsaturdaycoffee](https://t.me/berlinsaturdaycoffee) Hop in, say hello, and we’ll share the final details. **Why join?** *Because you deserve a break. - Because you enjoy being creative. *Because you enjoy boardgames - Because meeting new people sparks fresh energy. *Because coffee tastes even better when shared. - Because Saturday afternoons were made for this. Respect and Safety: There is always at least one organizer present at every meetup. If you ever feel unsafe or bothered by someone’s behavior, you can reach out to an organizer privately. Your identity will remain confidential, your concern will be taken seriously, and no inappropriate behavior is tolerated — anyone making others feel uncomfortable will be removed from the group immediately. We hope to see you there. Bring yourself, your smile, drawing materials, your stories—or just your comfy self. Let’s make Saturday a little more laid-back, a little more social and a lot more nice. See you soon! —Your Saturday Creative Coffee Crew ☕

**Rust Berlin Talks** is back for another evening of talks, shared ideas, and networking. Join us to learn, share, ask, and connect. If you work with Rust professionally, use it in side projects, contribute to open source, or are simply curious to learn more, you are very welcome. **Agenda** * Doors open: 18:30 * Start: 19:00 * Talks * Open mic / lightning talks * Networking **Speakers** Egor Lebedev - Welcome and a short note from the RustRover team Wolf Vollprecht - Pixi - A cross-platform package manager written in Rust Florian Gilcher - LLM Policies **Speaker Bios** Wolf Vollprecht is the founder and CEO of prefix.dev, where he builds open-source software supply chain infrastructure for the conda ecosystems. Core projects include Pixi (a cross-platform package manager written in Rust), rattler (crates to work with Conda packages), and rattler-build. With \~7 years in the conda ecosystem, including creating Mamba during his time at QuantStack, Wolf has a lot of experience in making package management fast, reproducible, and secure. Florian Gilcher used to be part of the Rust team in several positions and served as a member of the Rust Foundation board. He is also a co-founder of the Rust Berlin meetup. Today, he’s training Rust at Ferrous Systems, a company he co-founded. **Open mic & future talks** We’ll reserve a few short slots for anyone who wants to share something with the group. This can be a quick idea, a project, or an experience. Slides are optional. If you’re interested in giving a longer talk at a future meetup, this is also a good opportunity to connect with the organizers. **Venue & access** Please arrive on time. We will have someone at the entrance to let people in between 18:30 and 19:15. After that, access becomes more difficult as the doors are locked and require manual opening. **Registration** The venue has limited capacity and events typically fill up with a waiting list. If you register and can no longer attend, even at short notice, please un-RSVP so someone else can take your spot. Looking forward to seeing you all!

\*\*\*Aus organisatorischen Gründen wurde die Veranstaltung auf den 30.5. verschoben. Wir entschuldigen uns für die Unannehmlichkeiten und hoffen, Sie an diesem Termin zahlreich begrüßen zu dürfen. \*\*\*Per motivi organizzativi, l’evento è stato spostato al 30/5. Ci scusiamo per l’inconveniente e speriamo di vedervi numerosi in quella data. Buongiorno, Berlino! (Versione italiana in basso) **Sprichst du Italienisch** und möchtest **dein Deutsch verbessern**? Oder liebst du Italien und möchtest die Sprache üben? Dann komm zu unserer deutsch-italienischen Konversationsgruppe! * **45 Minuten auf Deutsch und 45 Minuten auf Italienisch**\* * Tische nach Sprachniveau aufgeteilt * Brettspiele, Gesprächsmaterialien und Arbeitsblätter zur Vertiefung von Themen und Wortschatz * Entspannte Atmosphäre * Lerne neue Leute kennen \* Die Veranstaltungsleitung behält sich vor, den Ablauf der Veranstaltung je nach Sprachen und Teilnehmerzahl anzupassen. Preis: Spende nach eigenem Ermessen (Die kleine Spende hilft, das Event auf Meetup zu organisieren und Materialien sowie Spiele bereitzustellen.) Die Italienisch-Werkstatt stellt Wasser und Süßigkeiten zur Verfügung. Für dich ist dies eine tolle Gelegenheit, dein Italienisch bzw. dein Deutsch außerhalb des Unterrichts zu üben und neue Leute kennenzulernen. Die **Italienisch-Werkstatt** ist eine Italienisch-Sprachschule in Berlin, die seit 18 Jahren professionell gestaltete Kurse für alle Niveaus anbietet. Alle unsere Dozentinnen und Dozenten sind italienische Muttersprachler mit langjähriger Berufserfahrung und soliden Deutschkenntnissen. Hier ist unsere Internetseite mit Kursen von A1 bis C1: [LINK](https://www.italienisch-werkstatt.de/)(Italienisch-Werkstatt) Wir können dir Hilfe und Tipps geben, um dein Italienisch — und auch dein Deutsch — zu verbessern! Unsere Lehrkräfte sind Italiener, die selbst Deutschlernende waren oder sind 🙂 Wir freuen uns auf dich! ✨ Bis zum Event! ✨ IN ITALIANO Halli Hallo! **Parli italiano** e vuoi **migliorare il tuo tedesco**? Oppure ami l’Italia e desideri praticare la lingua? Unisciti al nostro gruppo di conversazione italiano–tedesco! * 45 minuti in tedesco e 45 minuti in italiano\* * Tavoli suddivisi per livello * Giochi da tavolo, materiali per la conversazione e schede per approfondire temi e vocabolario * Atmosfera rilassata * Conosci nuove persone \* La direzione dell’evento si riserva la possibilità di modificare la struttura dell’evento in base alle lingue e al numero dei partecipanti. Prezzo: donazione libera (La piccola donazione aiuta a organizzare l’evento su Meetup e a fornire materiali didattici e giochi.) Italienisch-Werkstatt mette a disposizione acqua e caramelle. Per noi questa è un’occasione fantastica per praticare entrambe le lingue al di fuori del contesto della lezione e per conoscere nuove persone. **Italienisch-Werkstatt** è una scuola di italiano a Berlino che da oltre 18 anni offre corsi per tutti i livelli. Dal 2008 proponiamo lezioni di italiano per ogni livello. Tutti i nostri docenti sono madrelingua italiani con lunga esperienza professionale e solide conoscenze del tedesco. Ecco il link per la pagina internet con la nostra offerta di corsi dall’A1 al C1: [LINK](https://www.italienisch-werkstatt.de/)(Italienisch-Werkstatt) Possiamo offrirti aiuto e consigli per migliorare il tuo italiano… e anche il tuo tedesco! I docenti sono insegnanti di italiano e sono stati — o sono tuttora — studenti di tedesco 🙂 Ti aspettiamo! ✨Ci vediamo all'evento ✨

* German below -
Please bring clean indoor shoes with you to the location <3 The event fee varies between 5 to 10 Euros. 

Hey You!
On Friday I will teach you a few basic steps of shuffling. We will break down the steps, in your time, in your style.
We will explore your own flow of your body to different kinds of music and how we can use it in shuffling. I want to create a safe space for everyone who is just starting their shuffle journey or is already on the path. 

Address:
Milastraße 4
10437 Berlin
“Aziza-tanzt Tanzschule” 

Hallo Du!
Diesen Freitag möchte ich Dir ein paar Basic-Schritte vom Shufflen zeigen. Wir werden die Schritte langsam durchgehen, in deiner Zeit, in deinem Tempo.
Wir werden den eigenen Flow entdecken und wie Du deinen Körper zu verschiedner Musik im Shufflen integrieren kannst.
Ich möchte für jede Person einen Safe-Space erschaffen, egal ob Du ganz Neu bist oder schon etwas gelernt hast. 

Adresse:
Milastraße 4
10437 Berlin
“Aziza-tanzt Tanzschule”

Du möchtest dein Deutsch (Niveau **B1** bis **C1**) 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. Voraussetzung: mindestens solide Grundkenntnisse (B1) Die Veranstaltung ist kostenfrei! Wir freuen uns auf dich! 🌍

Warning There's no way to predict how much the blossoms bloom. Keine Erfolgsgarantie: Wenn nichts blüht , sind wir durch die Grenzen der Natur eingeschränkt. A simple outside cook meetup to make and take home ready made elderflower syrup. In the tiny park near Blaschkoallee grow some wild elderflower bushes and we make syrup directly from the blossom. Holunderblütensirup selber kochen ist ganz einfach - ich zeige euch die Blüten und wie man daraus haltbaren Sirup herstellt :) Im Park an der Blaschkoallee wachsen einige wilde Holunderblütensträucher und wir machen Sirup direkt aus der Blüte.

Come out to Improving for our monthly iOS and Mac meetings. This Month's Presentation: Nothing yet. (You should volunteer). What is Cocoaheads (http://cocoaheads.org/)? CocoaHeads is a group devoted to discussion of Apple Computer's Cocoa Framework for programming on MacOS X and iOS (including the iPhone, iPad and Apple Watch). During monthly meetings, members present on their projects and offer tutorials on various programming topics. What is BuckeyeCocoa (http://buckeyecocoa.org/)? BuckeyeCocoa is a group of Objective-C/Swift developers/enthusiasts. We host monthly Cocoaheads and near-weekly NSCoder meetings in Columbus, Ohio. The meetings are free to attend. Presentations! Presenters welcome! We are always in need of people willing to present material. Any Swift and/or Objective-C related topic is welcome. Times can be 5 minutes (i.e. lightning talks) to a maximum of 2 hours. Interested? Contact info is on the BuckeyeCocoa website. To volunteer for a presentation contact us at @BuckeyeCocoa on Twitter. Follow us on Twitter! @BuckeyeCocoa (https://twitter.com/#!/Buckeyecocoa/) For more information: http://buckeyecocoa.org/

[The Board Walks](http://www.theboardwalks.com/) are for curious people who love deep conversations. If that sounds like you, **bring a thoughtful topic** and join us for a 5-mile walk (10,000+ steps!). **HOW IT WORKS** **Step 1: Bring a topic** Before you arrive, think of **one** topic you want to explore. A question. A thought that's been on your mind. An obsession you want to geek out on. This is your ticket to the event. **Step 2: Circle up & share** We gather in a circle. Your friendly walk host gives a speech to set the tone. Everyone shares: your name, what you're grateful for, and your topic. That's it. 60 seconds. **Step 3: Walk, talk & float** We walk 5 miles. You naturally drift into conversation with 2-3 people at a time, pulled by topics that spark your curiosity. When you're ready to move on, just say: "I'm going to float!" **Step 4: Feel more alive** Two hours flies by. You're back where you started — but you feel different. More alive. More energized. More connected to yourself and others. That's why regulars join 20+ times. *For more details, read our [Orientation Guide.](https://www.theboardwalks.com/orientation)* **HOW TO BRING A GREAT TOPIC** A great topic = something you're genuinely curious about. Recent topics include: * "What are you passionate about right now?" * "What makes a good friend?" * "What's a belief you used to hold that you've completely changed?" * "How do you want to be remembered?" * "What would you do if money wasn't a factor?" Think of your topic like the dish you're bringing to our conversational potluck. If everyone brings an A+ dish (i.e. energizing, uplifting, expansive), we'll all walk away feeling lighter and brighter. **WHAT TO EXPECT** This isn't a fitness event with casual chitchat. It's a walking think tank where we explore life's big questions together, beyond small talk. *If you're looking for light banter or a standard networking event, this probably isn't the right fit.* But if you crave depth, genuine connection, and conversations that make you feel alive? You'll love it here. **FAQ** * Wear casual athletic attire and sneakers. It's a long walk! * We have multiple first-timers at each event. We work hard to create a welcoming, inclusive, clique-free space. * We welcome people of **all** ages, backgrounds, and industries who align with the [intention](https://www.theboardwalks.com/ground-rules) of this space. * Rain or shine, we've been out here nearly every week since July 2022. If the event is cancelled, we'll let you know. * Dogs, babies in strollers, parents, and friends are welcome — please text/email them the event link so they can RSVP and prepare a topic! **LOGISTICS** * If you'll arrive over 10 minutes late, we suggest skipping the event. It's hard to find us once we start walking, and your host can't answer messages during the event. * This walk is designed for everyone to *move together at the same steady pace* (about 20 min/mile). This format works best when the whole group moves in unison. If you have mobility limitations, we kindly encourage you to find an event better suited to your needs. * Read our [Orientation Guide](https://www.theboardwalks.com/orientation) for full details. * If you enjoy the event, send **[this](http://www.theboardwalks.com/)** to a friend or sign up for our **[newsletter](https://theboardwalks.beehiiv.com/)**. We're in multiple cities with more on the way. 🤠👋 **IF YOU WANT TO GO DEEPER...** [The Board](https://stan.store/ellebeecher/p/the-board) is the next step: a high-trust collective for renaissance people devoted to creating, connecting, and building lives that light us up. * This is a global HQ for people who crave big talk, deep connection, and dream collaborations with people across industries. If the walks feel like a spark... The Board is the fire. Apply [here](https://stan.store/ellebeecher/p/the-board).

**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** Like it or not, AI agents are now capable of turning a quickly written paragraph of requirements into a pull request that is ready to be integrated into real-world production applications and it's now our responsibility to make sure AI doesn't go rogue and take down prod - or corrupt our data by misunderstanding the requirements or our existing schemas. In this session we'll explore strategies to protect our codebases through unit and integration testing, documentation, and code review along with additional ways of providing context and guard rails to our AI agents as they carry out the work we've assigned them to do. By the time we're done, you'll have a firm grasp of the problem and understand some helpful options for protecting your codebase from vibe coding mishaps getting YOLOed into prod. **YouTube Link** https://youtube.com/live/BltmWMH1zG0?feature=share

The Alliance is part of the Greater Central Ohio Chapter of the Barbershop Harmony Society. We are an all-voices chorus dedicated to providing an inclusive environment for all those who love to sing, regardless of their race, gender identity, sexual orientation or musical background. The Alliance is the first and only all-voices barbershop chorus in Central Ohio. **Who:** Anyone with a passion for singing at a high level. Previous barbershop chorus/quartet experience not required. **When:** The Alliance rehearses weekly on Thursdays from 7pm-10pm. **Where:** Lord Of Life Lutheran Church: 2480 W Dublin Granville Rd, Columbus, OH 43235 To become a full member of The Alliance, we welcome you to start by visiting us for a few rehearsals to experience the group and sing with us! Then, you may begin the 2-part audition process for membership: the assessement, and audition. We strive to make our auditions as stress-free as possible to help you let your best singing self shine.

**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

Ciao a tutt\*! Let's meet Monday at 6.30pm at the Upper Arlington Library (**Tremont** Branch) in **Meeting Room A** to speak in Italian for 1 hour.

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