Knowledge Sharing

**Um was geht es dieses mal?** **Das Ende der Code-Ära: Warum Domain Modeling & Harness Engineering die wichtigsten Skills 2026 sind. - Benjamin Font Pera (codecentric)** "Die Ära, in der Softwareentwicklung primär durch das Beherrschen von Programmiersprachen und Frameworks definiert wurde, ist vorbei. Wer 2026 noch versucht, über reine Syntax-Kenntnisse Wertschöpfung zu generieren, hat gegen agentische KI-Systeme bereits verloren. Die eigentliche Herausforderung hat sich nach links verschoben: in die präzise Definition von Problemen und die Konstruktion von Leitplanken. In diesem Talk räume ich mit dem Mythos auf, dass KI uns das Denken abnimmt. Im Gegenteil: Die Verantwortung steigt. Ich stelle das Konzept des Harness Engineering vor – die Kunst, fachliche Anforderungen so in Test- und Evaluationsgerüste zu gießen, dass KI-Systeme darin verlässlich operieren können. Als Agentic Coding Engineer und AI Coach zeige ich auf, warum Fachlichkeit zur wichtigsten technischen Fähigkeit wird. Wenn die KI Code generiert oder “halluziniert”, ist das tiefe Verständnis der Domäne das einzige verlässliche Werkzeug zur Qualitätssicherung. Die Kernbotschaften: Problem-Definition als Hard-Skill: Warum die Fähigkeit, komplexe Fachlichkeit präzise einzufangen, das neue „Clean Code” ist. Harness Engineering statt Code-Fixing: Wie wir die Kontrolle behalten, indem wir das „Harnisch” (Evals & Guardrails) bauen, statt Zeile für Zeile zu reviewen. Shift Left zur Domäne: Warum Entwickler:innen 2026 mehr wie System-Architekten und Domänen-Experten denken müssen, um relevant zu bleiben. Lessons Learned vom AI Coach: Warum die größten Hürden dieser Transformation nicht technischer Natur sind, sondern im Mindset der „Lösungs-Produzenten” liegen. Dieser Vortrag ist ein Weckruf für alle, die Softwareentwicklung noch als Handwerk am Code verstehen – und ein Leitfaden für diejenigen, die bereit sind, die nächste Ebene der Abstraktion zu besetzen." **Hybrides Setup!** Wir freuen uns, euch bei uns in den Räumen der codecentric AG in Dortmund willkommen zu heißen. Vor Ort versorgen wir euch mit Snacks und Getränken und freuen uns gleichzeitig über interessante Diskussionen und einen guten Austausch. Für alle, die es nicht zu uns ins Office schaffen, werden wir das Meetup Hybrid durchführen. Der Stream beginnt ca. 10 Minuten später, damit wir vor Ort ausreichend Möglichkeit für persönliches Kennenlernen haben. Den Live-Stream findet ihr auf dem [YouTube-Channel](https://www.youtube.com/@codecentricAG) der codecentric AG. **Wichtig - Absage bitte rechtzeitig:** Wir bestellen das Essen bereits 3 Tage vor dem Meetup. Falls ihr doch verhindert sein solltet, bitten wir euch um eine rechtzeitige Absage. Das ist wichtig, damit wir nicht unnötig Essen verschwenden müssen. Vielen Dank für euer Verständnis! **Anreise:** Per Zug: Vom Dortmunder HBF sind es ca. 10 Minuten zu Fuß. Mit dem Auto: Rund um das Office gibt es einige Parkflächen, dazu befinden sich in dem Parkhaus der Thier-Galerie weitere Parkplätze.

**3D Workshop** * **Ontwerpen met Fusion360** * **Scannen in 3D** * **Het gebruik van 3D printers** **Je bent nu welkom in de nieuwe locatie NewTechPark** Je kunt ook online aan deze fysieke bijeenkomst deelnemen. De bijeenkomst is dan op de locatie te volgen. Als je [hier](w.j.put@hccnet.nl) vooraf een mailtje stuurt kun je dinsdagavond tussen 19.00 en 20.00 uur inloggen met Jitsi voor vragen, of ter kennismaking met hcc!3D. Online neem je deel aan de bijeenkomst met [https://wij.hcc.nl/3D](https://wij.hcc.nl/3D) [(Alleen toegang als je zichtbaar bent met voor- en achternaam. )](https://wij.hcc.nl/3d)

Is public speaking something you’ve always wanted to learn? Then you’ve come to the right place! Experience a safe and playful environment at U-Speak Toastmasters where you can develop your public speaking, communication, and leadership skills! ## **Welcome to U-Speak! Toastmasters** Join our vibrant community at U-Speak!, where internationals and Dutch locals from Utrecht and its surroundings come together. U-speak! Toastmasters is a welcoming, safe, supportive and playful environment where you can work on your public speaking, communication and leadership skills! ## **Discover our meeting experience** Curious about what happens during our meetings? Here’s a glimpse into a typical evening at U-Speak! Our gatherings feature a lineup of three prepared speeches, engaging evaluations and impromptu speaking sessions. At U-Speak!, every member gets their chance to shine. Whether you’re delivering a speech, providing feedback, or stepping up for impromptu speaking, our supportive environment ensures that everyone’s voice is heard and valued. * ⏰ Time: 19:15 - 21:30 (7.15pm to 9.30pm) Walkin at 19:15; Start of the meeting at 19:30 * 🌐 Venue: Room 8, Top Floor, Pub Florin, Utrecht * 🙋🙋‍♂️🙋‍♀️Attendance: Typically, 15-20 people attend each meeting Many of our club members are not on Meetup, so the number of people attending as indicated here is not reflective of the actual number of people attending on a night. * 🙋🙋‍♂️🙋‍♀️ Guests are welcome; rsvp is encouraged

Join us for an evening of good vibes! Whether you’re a local or an expat, Mingle Mania is the perfect place to socialize and make friends or even to practice languages. 🤝🤼‍♂️💬🙋‍♂️🫂 👉 Join [https://chat.whatsapp.com/GopSuzuFKRBKeYVKQrX4pE](https://chat.whatsapp.com/GopSuzuFKRBKeYVKQrX4pE) The group has many regular members, we intend to do various type of events, the goal is to build a strong community for all sorts of activities. If you have an event idea that you would like to see happen, let us know. We generally have about 20 participants, the age is between 20 and 60 averaging somewhere around 30, language exchange is not strictly enforced, culture exchange happens naturally. **mingle** (verb, intransitive): to move among people and talk to them, especially at a social event. 📍 **What We Are:** * A diverse group of locals and expats * ...going out at least every Tuesday 😊 🆓 **Event Details:** * It is free to join and operated on a voluntary basis! * Please honor the bar by ordering at least one drink.

Every Tuesday, the group 024 Waalrunners go for a run at a distance of between 7km - 10km depending on the group. Everyone is welcome to join, you just need to turn up at 20:00 on Tuesday in front of Cafe De Hemel. There are different routes every time, and the group welcome all new people to join them. [https://www.facebook.com/024waalrunners-710731759317504](https://www.facebook.com/024waalrunners-710731759317504)

Hi Everyone, This is our weekly open hackerspace evening! Usually from 19:00 :-) Feel free to drop by, come and nerd with us! See this Tuesday! We're in room 126, ring the room number and we'll open the door. We're located on the first floor

Our sister company FrontValue is organizing a great meetup which might be of interest for you as well! Same location as you're used to. **RSVP via** https://www.meetup.com/frontvalue/events/314972778/ We are back with two great speakers! 💡 First on stage is **Bart Waardenburg**, the creator of the tool **Fallow.** His tool gained significant traction after it was discussed on the web development podcast Syntax. **Vibe Coding Doesn't Scale: Deterministic Tooling for Agentic Engineering** *AI Slop Is a Tooling Problem* Most AI coding fails in the same way. The model writes plausible code, but it has no deterministic way to check whether the change made the codebase better or worse. We compensate with prompts like "make no mistakes", "follow best practices", or "act like a senior engineer". In his talk, Bart shows where the line runs between AI slop and real agentic engineering. Using Fallow as the case study, he walks through how an agent calls deterministic codebase-quality checks through CLI, MCP, and agent hooks, so engineering standards live in the loop itself instead of in wishful prompts. The agent generates code, inspects the repository, detects dead code, duplication, complexity hotspots, and boundary violations, optionally combines that with runtime evidence, and uses those signals to refactor or self-correct before a human reviews the diff. The core idea is simple. The biggest productivity gains do not come from telling the model to be smarter. They come from giving it a better harness. For frontend teams, that is the difference between vibe coding and scalable, reviewable engineering. [https://fallow.tools/](https://fallow.tools/) 💡 After the break, we welcome **Sander van Surksum** on stage. Sander is a web performance specialist who works with global brands to build fast, stable and world-class digital experiences. **Vibe coding made the web sick. Now it can fix it.** Since ChatGPT went live in November 2022, the median mobile web page has been getting heavier three times as fast as before. AI didn't invent bloated front-end code; it learned from a "lost decade" of bad patterns and industrialized them. Sander follows the evidence: the public HTTPArchive data that marks the inflection point, and Alex Russell's *Performance Inequality Gap*, which asks the question most teams never do — **whose device are we actually testing on**? Spoiler: the bill isn't paid by the developer on a MacBook Pro and fibre. It's paid by the user on a €300 Android, 9 Mbps. The same code, two completely different realities. Today's median page is already bigger than the entire game DOOM. The talk ends with good news. The same AI that made the mess can help clean it up, once you give it eyes. We'll look at the 2025–2026 tooling (Chrome DevTools MCP, Google's Modern Web Guidance) that finally lets AI agents measure real performance and ship lighter code, and close on the one question every engineer should answer before their next prompt: **who are you building for**? **📍 Location** We welcome you to our office in Utrecht: Studio N in the Werkspoorkathedraal. The address is Tractieweg 41. We have plenty of free parking space available. We will have dinner ready for you at 18.00! **🕔 Agenda** **18:00** Walk in & food **18:30** First talk **19:30** Break **20:00** Second talk **21:00** Drinks & Bites Both talks are in English. RSVP now for an evening of learning and fun. Don't miss out on this amazing opportunity to learn and connect with our community of frontend developers!

**Welcome to The AI Meetup, the premier gathering for AI enthusiasts and beyond!** Whether you're a seasoned professional or just starting out in the field of artificial intelligence, The AI Meetup offers a unique opportunity to connect with like-minded individuals, network with peers, and gain valuable insights into the world of AI. **Timetable** 18.00 - Doors open: have a drink and a chat w/ other guests 18.45 - Kick-off 19.00 - Tom Mulder ([Pollen Robotics](https://www.pollen-robotics.com/), part of [Hugging Face](https://huggingface.co/)) 19.45 - Julius Brussee (Founder [Caveman](https://github.com/JuliusBrussee/caveman/) & [Stacklink](https://stacklink.nl/)) 20.30 - Pizza and Drinks: time to share knowledge and insights 21.30 - Let's wrap It up The AI Meetup covers a wide range of topics and disciplines. Whether you're a data scientist, AI researcher, developer or just someone with a passion for all things AI, you don't want to miss this. PS Did we already say there's pizza and drinks!

10 bowling lanes, disco music, snacks and shots! And a lot of fun people on this annual event! A fun evening full of oooohh's and aaahhh’s and this is why: https://youtu.be/9Usnkt4mEvM It’s all about having fun, so don’t worry if this is your first or second time playing. We will help you and we always cheer every player to victory so everyone has a great experience. We will play bowling and have snacks, and free shots for everyone in your lane if… you throw a strike on the right moment in the game. Pls be aware - paid event - read all information! I reserved 10 lanes for 2 hrs, so we play from 22.00 - 00.00. Since I have to pay in advance I ask everyone that joins to pay their part as well in advance. If you join the list for this event, please transfer 20 euros when I sent you the tikkie or make someone on the waiting list happy by giving your spot to him or her. I will sent a tikkie or publish it in the comments. Your spot is only confirmed after payment. No pay. No play. Please note that there is no refund for cancellation, since I have reserved bowlinglanes and have to pay full price wheter we are with 10 people or 3 people. In case you can't make it, I suggest you find someone to take your spot and he or she pays you the money back. If someone on the waiting list takes your spot then a refund is possible. If someone takes your place, pls let me know in advance. Pls be on time. We start bowling at 10 pm sharp. So be there at least 30 minutes early since u need to change shoes and maybe want to get a drink at the bar. After the bowling we usually go to a café in the city for drinks but if u feel like going home this is ofcourse also okay.

Join the Dutch Outdoor and Hiking Group for a day hike and enjoy Beautiful shell path along the Lower Rhine and visiting De blauwe Kamer and hiking on the Grebbeberg * We **start at 11:00** from the train station in Rhenen https://maps.app.goo.gl/CrbeFtQPutUSYWFp7 * Length: \~18 km (4 - 5 hr hiking) * What to bring: lunch, water, snack. * For whom: As always, sporty folks that like to combine social event with being active in nature. **Getting there by Train:** * To train station in Rhenen. https://maps.app.goo.gl/CrbeFtQPutUSYWFp7 **Getting there by Car:** * Free Parking: Stationsplein, 3911 AP Rhenen https://maps.app.goo.gl/qVrH9pA5JK2prQPg9 **Note:** * Please **pay a small fee (3 euro)** to help us cover the (increased) yearly Meetup contribution of 240 euro. We'll ask you to pay before the start of the hike (can be on the day itself). No refunds, but in the unlikely event that hike would be cancelled and you already paid, you don't need to pay for your next hike. Thank you so much! Use the **safe link** here: https://www.ing.nl/payreq/m/?trxid=WrVKENccZiV4tdRSPrVbFG4WVyikUVQn * Keep in mind that the hike can be canceled when the weather is very bad (**always check the event before you go**). * If you RSVP 'yes' we expect you to show-up. Please do not cancel less than 24 hours before the hike. **No-shows** will lead to your removal from the group. Thanks for the understanding. * By signing up for this event, you agree to release the organizers from any responsibility and liability in all claims. As the participation is strictly voluntary and you freely choose to join, it is the responsibility of individuals participating to ensure that they are fit enough and have adequate coverage to protect themselves.

I'm excited to host the 24st edition of *Strangers to Friends*! Every event so far has been warm, fun and full of great connections. So we’re doing it again! Curious about our previous events? Check out our photo albums (only visible on the laptop version of Meetup). **What to expect** * A safe, relaxed environment to meet both locals and expats, whether you want to meet new people, experience an international atmosphere or talk about business, it’s all possible. * Start the evening with a few rounds of conversation cards: pair up with someone you don’t know, answer meaningful questions and rotate every 10 minutes. Within just one hour, you’ll get to know several people really well and enjoy meaningful conversations. * Everyone comes on their own, so it’s easy to connect. **Practical details** * Doors open at 20:00, after 30 minutes we start with conversation cards * Venue: Boekencafé Libertas, Klarendalseweg 477-1, Arnhem * 20 min walk from Arnhem Central * 7 min walk from Arnhem Velperpoort * You’ll receive 1 drink token for (beer/wine/soft drinks) and snacks all night! * Find us on the right side of the café at the bar, by the window and garden Bring a smile and join us for an evening where friendships grow, business ideas spark and real-life connections happen. Back to basics, away from screens, meeting face-to-face. Warm regards, Julia

*Please note: this meetup will be held in English.* In this first meet up, you will be shown a set of immersive artistic and design research experiments. Project Thuis conducts two years of artistic and design research into immersive experiences that place the body at the centre. The central question is: "How can immersive experiences in (semi-)public spaces contribute to a sense of connection, belonging, and 'feeling at home'? To explore this, a multidisciplinary consortium consisting of [Fillip Studios,](https://www.fillipstudios.com/) [affect lab,](https://www.affectlab.org/) [Introdans,](https://introdans.nl/) [Utrecht University,](https://www.uu.nl/staff/SPonzanesi) and the [Amsterdam University of Applied Sciences,](https://civicinteractiondesign.com/) has embarked on a creative journey together. Within the context of Project Thuis, this meetup will focus on artistic and design research forms applicable across various disciplines. **Programme:** 16:00 - 16:15: Opening 16:15 - 17:15: Interactive session 17:15 - 17:30: The role of the maker in the future of immersive experiences 17:30 - 18:00: Networking and drinks (including presence of [CIIIC](https://us2.mailchimp.com/mctx/clicks?url=https%3A%2F%2Fwww.ciiic.nl%2F&xid=f4ced03a90&uid=2313462&iid=e62065ab18&pool=cts&v=2&c=1780312609&h=0b99fb0b79b5fe3d2625a4891bea9d8bc6ef045db3b8ee6ffe56d6cfc6e501c4)) Within the context of Project Thuis, this meetup will focus on experiments that you, as a maker, can use to conduct artistic and design research across various disciplines. *[This event marks the first in a series for Project Thuis (Home). Ontwerp Platform Arnhem has been invited to organise the meetups. We strongly endorse the importance of initiatives like this, and are highly committed to connecting designers with these themes and consortia](https://www.ciiic.nl/)***[.](https://www.ciiic.nl/)**

Bakery Walk: A Sunday Girls Stroll Let’s romanticize our Sundays in Amsterdam. ☕🥐 We’ll meet and start with a relaxed city walk for coffee & pastries. Between stops, we’ll: ✨ Mix & match conversation buddies ✨ Use fun conversation cards (no awkward small talk) ✨ Get our steps in (pastries taste better after walking 😉) Perfect for new expats and women looking to build genuine friendships in Amsterdam. Come solo. Leave with new connections Please note: everyone buys their own pastries & drinks at the bakeries. That way you can pick what you like best! **Join our WhatsApp group💕** https://chat.whatsapp.com/JFgvbHvRLoP5P9K3GtwGlU?mode=gi_t

Who says games are just for kids? Remember playing games when you're a kid with no need for a manual and no responsibiliies? That's what we're doing. Tag, Cops and Robbers, Ninja... Stir up the memories of what made you happy and bring that pure joy out. Sign up through this [1 question form.](https://forms.gle/XWHNG63iyzuumEon8) To make our inner child completely satisfied, we'll reward ourselves with a hangout and pancakes at Teahouse Rhijnauwen after! 💵 Price : Free 👝What to bring: water, sunscreen, comfortable shoes, an open mindset

Sound bath healing is a meditative and immersive experience where soothing sounds and vibrations from various instruments, such as Comanche drums and rattles, wash over you, promoting relaxation, reducing stress, and harmonizing your energy for a profound sense of well-being. Pre registration is required for this session. *PLEASE NOTE: YOU MUST SIGN UP FOR THIS SESSION BY CALLING MYSTIC FLOW; OR USING THE FOLLOWING THE ATTACHED LINK.* Replying on meetup may not guarantee your seat. [Classes - Mystic Flow Wellness Center](https://mysticflowwellnesscenter.com/offerings/classes/) or call our center at 571-284-7612. Spots fill up quickly for this very popular bi-monthly session. The cost is $60.00 per person. Private sessions are available by appointment as well.

Some events and situations happen in our lives that can change the entire trajectory of our existence. Navigating through those murky waters can be extremely overwhelming. This group is a safe place for you to learn new ways to cope, accept, and move forward. Join us on the second Wednesday of each month at 7:00 pm There is no charge for this support group. Please call our center to RSVP within 24 hours of the class. We hope to see you there. Feel free to bring a friend.

We will be meeting at Starbucks to learn together. Come with an online class you're already going through or an interest and we will try to connect you with a course where you can learn it. Already have a skill you want to contribute to a Kaggle Datascience competition? We will work on these too! Laptop required :)

📚 Do you love reading, but wish you had a structure and a community to share your insights with? Join our small circle of curious minds (just 4 members per gathering) as we come together for an hour of focused reading—in the calm setting of a library or the cozy atmosphere of a café. Here’s how it works: First part: Quiet reading on your own—bring a book you’re exploring, whether it’s philosophy, history, psychology, literature, or anything meaningful to you. Second part: We regroup and each person shares key takeaways, insights, or questions sparked by their reading. This sparks a structured yet free-flowing conversation around ideas, perspectives, and personal reflections. Why join? Add structure to your reading habit. Discover new books, authors, and ideas through others’ choices. Build real connections by sharing and listening deeply. Socialize around something meaningful instead of small talk.

Important: Register on [AICamp website](https://www.aicamp.ai/event/eventdetails/W2026061814) is required for admission. **Description:** Welcome to the AI meetup in Washington DC. Join us for deep dive tech talks on AI, GenAI, LLMs and Agents, hands-on experiences on code labs, workshops, and networking with speakers and fellow developers. **Agenda:** \* 5:30pm\~6:00pm: Checkin, Food/drink and networking \* 6:00pm\~8:00pm: Tech talks and Q&A \* 8:00pm: Happy Hour at Courthouse Social (cross the street) **Tech Talk: Secure Developer Environments in the Age of AI Agents** **Speaker:** Patrick Brown (Coder) **Abstract:** Federal engineering teams are under pressure to ship faster while meeting some of the most demanding security and compliance requirements in the world. In this talk, Patrick Brown of Coder explores how cloud development environments (CDEs) give agencies a foundation to accelerate software delivery without sacrificing control — and why that foundation matters even more as AI-powered coding agents enter the workflow. He'll cover how CDEs keep source code off endpoints, enforce zero-trust access patterns, and provide the consistent, ephemeral infrastructure that both human developers and AI agents need to operate safely at scale. **Speakers:** Stay tuned as we are updating speakers and schedules. If you have a keen interest in speaking to our community, we invite you to submit topics for consideration: [Submit Topics](https://forms.gle/JkMt91CZRtoJBSFUA) **Sponsors:** We are actively seeking sponsors to support AI developers community. Whether it is by offering venue spaces, providing food, or cash sponsorship. Sponsors will not only speak at the meetups, receive prominent recognition, but also gain exposure to our extensive membership base of 5,000+ AI developers in D.C and 500K+ worldwide.

We do the Unlimited bowling for $21.99 shoes included. You can bowl as many games as you like.

⚡ Reset your direction. Meet someone unexpected. Walk away with fresh clarity. Join us for a relaxed **small-group afternoon event** that blends a light **Inner Coach conversation experience** with a **community potluck lunch**. In February we hosted our first **Inner Coach event**, and many attendees said it helped them notice something powerful — the voice inside that quietly guides better decisions when life gets complicated. This event builds on that idea. Instead of overthinking the past, we’ll explore how to **reset direction for what’s next** — through thoughtful conversation, new perspectives, and the kind of questions that spark real insight. We’ll start with a few short conversation rounds designed to spark reflection, humor, and perspective — and then continue the discussion over food and relaxed conversation. Think **good food, grounded people, and real conversations about what comes next in life.** Held in our **Startup Garage** — a bright, comfortable living-room style space inside a single-family home. (Couches, food, conversation — **not an actual garage** 😊) *** ## **🥘 Potluck Lunch** If you're able, bring something small to share. Homemade or store-bought — both welcome. A dish you enjoy making. A dish that always works Or simply something easy from the store If you're busy, come anyway — the goal is **community, not perfection**. We’ll share a relaxed **afternoon potluck lunch** while continuing meaningful conversations with people navigating their next chapter. *** ## **What You’ll Experience** • Light conversation rounds designed to spark insight • Fresh perspectives from people navigating similar life transitions • Humor, perspective, and grounded conversation • A relaxed environment where ideas and connections happen naturally *** ## **Who Typically Attends** • Professionals in their 30s–40s–50s • Entrepreneurs and builders • Divorced or separated individuals navigating what’s next • People who prefer thoughtful conversation over surface-level small talk Whether you're **resetting direction, building something new, or simply meeting grounded people**, this event is designed for honest connection and fresh perspective. *** Most attendees are navigating life and growth with **curiosity, clarity, and a sense of humor.** 📍 Hosted in a spacious living-room setting inside a single-family home (Ashburn – 20147). Full address and parking details are emailed **2–3 days before the event.** 🌐 Learn more about the community [https://midlifereinvention.co](https://midlifereinvention.co) *** If you're curious about the **Inner Coach vs Inner Critic concept**, here’s a short introduction: [https://www.youtube.com/watch?v=OtgoDgqppGI](https://www.youtube.com/watch?v=OtgoDgqppGI)