Open Source

Dear JUG members, We’re happy to share that ApeldoornJUG will once again serve as an official Community Ambassador for **J-Spring 2026 – The Future of Modern Java**. 📍 J-Spring Conference 2026 🗓 June 4, 2026 📌 Kinepolis Utrecht **This year’s conference will cover:** • Data, AI, GenAI & prompt engineering • Platform engineering & architecture • Security • People & Culture • New & exciting topics Featuring speakers such as **Holly Cummins, Josh Long, Marit van Dijk, Nicolai Parlog, and many more.** Expect inspiring keynotes, hands-on workshops, and labs. Also returning this year: **The Mentorship Hub powered by Bruno Souza**. **The talk schedule is now live:** 👉 [www.jspring.nl](https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.jspring.nl%2F&data=05%7C02%7Ca_de_ruiter%40belastingdienst.nl%7C757f3b88ba6a4ee59d8e08dea6c04f2b%7Cc8fba4776d4d4f00941a6e6150c721f3%7C0%7C0%7C639131542095649438%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=cPr6C5RZu19Vm4tM%2FXDakYUCx5qf1sztXzyHIqvUGgY%3D&reserved=0) Looking forward to seeing you there!

¡Compartamos juntos con el grupo de personas más divertido de la ciudad!... ¡en español! No necesitas ser un hablante fluido o nativo.... ¡Solo atrévete a compartir! Te esperamos a las 20hrs.... ¡Entrada gratuita! ¡Nos vemos! ¡Hasta entonces! 😃 Let's share together with the funniest group of people in town!... in Spanish! You don't need to be a fluent or native speaker.... Just dare to share! We wait for you at 20hrs ....Free entry! Nos vemos! Tot dan! 😃 Facebook Group: https://www.facebook.com/groups/habladores/ Meetup Link: https://www.meetup.com/nl-NL/los-habladores/ Instagram page: https://www.instagram.com/los_habladores_utrecht/ Los Habladores!

**Speeddaten Utrecht** Al twaalf jaar organiseren we speeddates in Utrecht. Ontmoet je graag een groot aantal singles in korte tijd, dan is speeddaten iets voor jou! Tijdens een speeddate heb je ongeveer 15-20 dates van 4 minuten. Wanneer de bel klinkt, schuift de helft van de singles door naar de volgende tafel. Op je datekaart geef je aan met wie je verder in contact wilt komen. **Locatie** Het speeddaten vindt plaats bij [Anne&Max Domstraat](https://www.annemax.nl/vestigingen/utrechtdomstraat/), een sfeervol en ruim opgezet restaurant. We hebben een apart gedeelte van het restaurant gereserveerd, zodat je alle privacy hebt tijdens het daten. **Matchmail!** Binnen een dag na de speeddate ontvang je van ons een e-mail met de voornaam en het e-mailadres van de singles met wie je een match hebt. Heb je bij alle deelnemers ‘nee’ ingevuld? Dan is je volgende speeddate [gratis](https://aboutlove.nl/geen-klik-volgende-speeddate-gratis/)! **Kom je ook speeddaten bij About Love?** Heb je zin in een avond vol ontmoetingen in Utrecht? Schrijf je dan nu in voor deze speeddate! Bij About Love ben je in goede handen; wij zijn een ervaren speeddate-organisatie met uitstekende [recensies](https://aboutlove.nl/is-speeddaten-leuk/) en bieden speeddates aan voor de laagste prijs. Date je mee? >> [https://aboutlove.nl/event/details/speeddaten-utrecht-33-47-jaar/](https://aboutlove.nl/event/details/speeddaten-utrecht-33-47-jaar/)

Join us for an hour of writing! We’ve discovered that it’s strikingly helpful to write with other writers. See if it’s true for you at Factor-ij Amsterdam on Thursday mornings. Be it a book, blog, script, essay, dissertation, resume, melody, poem or just plain work stuff, you are invited to write it with us. No one will see what you've written or give you unsolicited advice. Instead of just thinking about writing, come and get some real writing done. SCHEDULE: 11: 15 AM - Quick introductions 11: 30 AM - Timer starts: write for 1 hour 12: 30 PM - The End: chat, take off, or keep writing OPTIONAL SOCIALIZING happens at 12:30 pm after the writing is wrapped. Writing is very solitary. Connecting (and sometimes even commiserating) with other writers is a cool thing. BEING LATE IS OKAY: just show up and get settled, then check-in with me after the session. (I’ll be the person with the Shut Up & Write! sign.) If you were on time, please be willing to make room for the friendly latecomer. Happy writing and I look forward to seeing you at Factor-ij! What Should I Bring? Whatever you need to be able to write! Bring earbuds/earplugs if you want to block the cafe’s overhead music or the occasional conversation by other patrons. Please come with your devices pre-charged, since we probably won't be always sitting somewhere with charging possibilities. Other Important Details: Travel by public transportation: 1. Take Tram 26 from the central station Amsterdam, and step out by the last stop. 2. Take bus 66 from the Amsterdam Bijlmer station, step out by Pieter Oosterhuisstraat, and further walk in the direction of the bus till the corner. FREE Wifi. Compulsory consumption is not required, but please do order a drink to honor our generous host.

We are thrilled to welcome you to our 10th edition of the AI Native Netherlands, hosted at the [Yuma](https://www.weareyuma.com/en) headquarters in Amsterdam. This edition is capped at 120 attendees. Yuma's office has limited space, so once the 120 seats are filled, registration closes and additional signups move onto the waitlist. A massive thank you to our host, Yuma, for their generosity in providing the venue, food, and drinks for this evening and for supporting the Dutch AI engineering community. **We'll cover:** * What humans still bring to software building when AI is writing the code * Tackling technical and social complexity inside distributed, fast-moving systems with legacy at the core * How to evaluate AI agents in production and catch silent regressions in under an hour * What "AI Native infrastructure" looks like in the wild: prompt changes, harness updates, RAG documentation, model swaps **Speaker 1: [Nico Krijnen](https://www.linkedin.com/in/nicokrijnen/) ([Yuma](https://www.linkedin.com/company/weareyuma/))** An explorer at heart, Nico loves to navigate the ever changing technology landscape and find practical solutions to complex problems. For a big chunk of his career, he disrupted the DAM space by building an innovative file management solution called Elvis, which is being used by media organizations all over the world. Besides leading and supporting teams and giving direction, he likes to roll up his sleeves and experience first-hand how (and whether) the latest technologies work in the real world. He is never shy of making unconventional choices to achieve radical results. **Talk: The human side of coding** Now that AI's are writing our code, what is the value that we humans still bring to building software systems? Our tech stacks are exploding in complexity, systems are more and more distributed and fast-paced development leads to an ecosystem full of fragile legacy systems that provide the backbone of business capabilities. How do we tackle that technical and social complexity? Do we take the usual route and solve it by adding more tech or AI? Or is there another way? Even in the 80's, people realized that the theory of a system can't be transferred through code and documentation alone. It requires developers to work closely together. We need to encourage human collaboration across disciplines, backgrounds and personalities (including our new AI buddies). Learn how you can use your human power skills to better understand the problems you're facing and build systems that last! **Speaker 2: [Floris Weers](https://www.linkedin.com/in/floris-weers-61392b160/) ([Biscuit](https://www.linkedin.com/company/biscuit-so/))** Floris is an ML engineer based in Amsterdam. He was responsible for continued-pretraining (or mid-training) at Apple's Foundation Model team, contributing directly to Apple Intelligence. Before that, he finished his master's degree at the University of Twente while building games on the side. He is a named author on the Apple Intelligence Foundation Language Models tech report, which describes the \~3 billion parameter on-device model and the large server-based model powering Apple Intelligence features. His research work at Apple also spanned multimodal models, mobile vision transformers, and distillation scaling laws. **Talk: The silent failures of AI: how to evaluate?** AI doesn't crash when it fails. It quietly does half the job. We'll go over a systematic way to evaluate agents in real product settings, allowing us to catch regressions and decide within an hour whether to use a newly released model or stick with the previous setup. A side-effect of the evaluation framework is that no engineer is scared of touching system prompts, making deeper harness changes or adding documentation to the RAG systems. **Agenda:** 18:00 — Arrival, food & drinks 18:30 — Talk \#1 \| Nico Krijnen 19:15 — Talk \#2 \| Floris Weers 20:00 — Networking & more drinks 21:00 — Wrapping up **What to bring:** Just curiosity and questions. If you've been working through agent evaluation, RAG system updates, or human-AI collaboration in your engineering team. **Who is this for:** Platform engineers, AI/ML engineers, SREs, architects, and engineering leaders focused on building and validating reliable AI systems in production. **Where to find us:** Yuma (4th floor), Business Centre Pedro de Medina, Pedro de Medinalaan 1, Amsterdam. 15 minutes from Amsterdam Central using tram 26. Paid parking at Parkbee Sluishuis across the street. [Maps link](https://maps.app.goo.gl/bd353dgCFd4TkDEq8)

Cada primer jueves del mes: café español (! atención ! : nos mudamos a Mariapaviljoen, en frente al shopping Arena) en el centro de Den Bosch, ¡bienvenid@s a tod@s! \*\*\* Para todos los amantes del español: cada primer jueves del mes nos juntamos para hablar el idioma de Frida Kahlo, Mercedes Sosa y Penélope Cruz ;). Un encuentro informal para conocer a otros hispanohablantes y compartir risas, experiencias y buenas vibras. ¡Bienvenid@s! (entrada libre y gratuita) Voor alle liefhebbers van de Spaanse taal: elke eerste donderdag van de maand komen we samen om de taal van Frida Kahlo, Mercedes Sosa en Penélope Cruz te spreken ;) Een informele bijeenkomst om andere Spaanstaligen te leren kennen, samen te lachen en ervaringen uit te wisselen. Wees welkom! (gratis entree) (Organizadora: evelyne montens > si tienes alguna pregunta, no dudes en contactarme por messenger)

Are you an **expat** in **Diemen** and do you want to **learn how to swim?** Look no further! Dive into **personalized swimming lessons** with **Your Personal Swim Coach**. Whether you’re a beginner looking to learn the basics or an advanced swimmer seeking to refine your technique, our expert coaches offer **tailored sessions** that fit your needs. The **AGO** pool in Diemen is a small private pool originally utilized for **aqua therapy**. Therefore the water is nicely **warm** which gives ideal teaching conditions. **Don't wait any longer:** **[Sign up for a Try Out Lesson!](https://www.your-personal-swim-coach.nl/product/try-out-adult-swimming-lesson/)** Want to learn more first? Go to our **[website](https://www.your-personal-swim-coach.nl/)** or **[schedule a call!](https://calendly.com/ypsc/new-meeting)**

Iedereen is welkom op onze open Freedom Friday Bitcoin Turnhout Meetup @ het super gezellige café Sint Pieter - Grote Markt 60, 2300 Turnhout Geen presentaties. Geen workshops. Gewoon 1 onderwerp: bitcoin. **Connect with Like-Minded Minds** Engage with the Bitcoin community and mingle with fellow enthusiasts. This meetup is your chance to discuss the future, share ideas, and network with pioneers in the decentralized money world. 🏢 **Central Location**: café Sint Pieter ligt perfect centraal, een ruim cafe op de grote markt van Turnhout. Mark your calendars and spread the word!

*Since the guided meditations for this event are in Dutch, this description is too.* Wil je je drukke week afsluiten en ontspannen aan het weekend beginnen? Dan ben je geheel vrijblijvend welkom bij de vrijdagavond meditatie van [Jewel Heart](https://www.jewelheart.nl/). Deze meditatieavond heeft een licht en open karakter. De meditaties bestaan uit drie delen. We beginnen met het gewaarworden van je lichamelijke sensaties. In een korter deel twee doen we een loopmeditatie en in deel drie is er een eenvoudige, geleide visualisatie meditatie. Het geheel wordt afgesloten met een gesprek onder het genot van een kop thee, voor wie daar zin in heeft. 📍[Jewel Heart, Hatertseveldweg 284, Nijmegen](https://maps.app.goo.gl/D4FzqLbkaqs2JNDG8). Loop de oprit op en dan is de ingang aan je rechterzijde 🕒Zaal open vanaf 19.30 uur, meditatie van 20.00 tot 21.00 Je bent van harte welkom! Aan deze activiteit kun je per keer meedoen. Er zijn geen verplichtingen. Op vrijwillige basis kun je op de avond zelf een donatie doen. Kijk ook naar onze -[Open activiteiten](https://www.jewelheart.nl/nl/open-activiteiten/) -[Cursussen](https://www.jewelheart.nl/nl/cursussen-overzicht/)

During this open day, you’ll learn all about the many exciting aspects of a coaching training program and find out if this career path is the right fit for you. Special thanks to our friends at the Academy for Coaching and Counselling (ACC) for hosting this event. **ACC in a Nutshell** * **30 Years of Experience:** Since 1996, the ACC has trained thousands of successful coaches and counsellors. Most of them still hold a thriving practice, work as a teacher in the profession or have excelled in their professional careers. * **Comprehensive Training:** Develop your coaching and counselling skills from foundational techniques to advanced specializations with the ACC’s flexible two-year English training program, tailored to support your unique learning path. * **National and International Recognition:** Exemplary recognition for its institute and educational programs. * **Flexible Learning Options:** The ACC training programs take place in various cities in the Netherlands or in a live online setting, accessible worldwide. **Join the open day in Utrecht** Are you an international professional ready to take the next step in your career? Strong coaching and counselling skills help you communicate more effectively, support others through change, and create meaningful impact in your work. These skills are valuable across many professional roles – and can also form the foundation for a new career as an independent coach or counsellor. Many of the participants use the program to strengthen their professional effectiveness, while others successfully transition into a new career path. **Join the free Open Day on Saturday June 6th to discover how you can:** * Develop advanced listening and questioning skills. * Communicate with clarity, empathy and confidence. * Support people through professional and personal challenges. * Strengthen your impact in your current role. * Build a solid foundation for a career as an independent coach or counsellor. The ACC’s internationally recognized programs combine personal development with practical professional skills that you can apply immediately. Participation is free of charge. **Location:** Marekerk Zandweg 126 3454 JZ Utrecht view in [Google Maps](https://maps.app.goo.gl/4TfpEKQhrnYq7M1HA) **During this open day you will:** * Receive information about how to become a coach or counsellor in The Netherlands. * Discover the ACC’s training programs and what can be achieved with them. * Meet teachers, staff, and former students. * Get informed about the ACC’s accreditations and recognitions. * View course materials. * Receive advice on which training program suits you best. **Register** [FREE](https://tinyurl.com/ACC-June6th-OpenDay) **About ACC** The Academy for Coaching and Counselling (ACC) has offered training programs in the field of coaching and counselling since 1996. We stand for a personal approach with a focus on our students’ unique life paths. At the ACC, we attach great importance to quality. This is also reflected by our various accreditations, certifications and quality marks. We offer training programs in which people discover and develop their own talents, and learn to guide others in their process. In Year 1, you’ll learn the fundamentals of coaching and counselling. After completing this first year, you can deepen your skills and choose to specialize further – for example, by continuing with Year 2 or enrolling in our Addiction and Recovery specialization. Both Year 1 and Year 2 programs are available either in-person (classroom) or Live Online (via Zoom). The online program gives you the possibility to be guided by a teacher and practice with your fellow students onscreen from anywhere in the world.

'HOMEGOING' by Yaa Gyasi 'Two sisters with two very different destinies. One sold into slavery; one a slave trader's wife. The consequences of their fate reverberate through the generations that follow. Taking us from the Gold Coast of Africa to the cotton-picking plantations of Mississippi; from the missionary schools of Ghana to the dive bars of Harlem, spanning three continents and seven generations, Yaa Gyasi has written a miraculous novel - the intimate, gripping story of a brilliantly vivid cast of characters and through their lives the very story of America itself. Epic in its canvas and intimate in its portraits, Homegoing is a searing and profound debut from a masterly new writer.' ***Please read the book and join us for a lively discussion (in English) about the contents during our afternoon book club meeting.*** \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- **PLEASE NOTE:** This is an IN-PERSON event in Amersfoort, The Netherlands. Please cancel your attendance in advance if you are unable to join, so that those on the waitlist can participate. Looking forward to seeing you all IN REAL LIFE then! Best regards, Sandra

* We **start at 11:10** in front of Hotel Restaurant de Loenermark: Eerbeekseweg 4, Loenen https://maps.app.goo.gl/4W6e27ij3aqjQnFg6 * Length: \~16 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 bus:** * Bus stop: Loenen, Bruisbeek https://maps.app.goo.gl/863vGKfe8nqBvZfw7 **Getting there by Car:** * Free parking opposite of Groenendaalseweg 15, Loenen https://maps.app.goo.gl/W6213M7LwEQv8PMg6 or Free parking in the streets, close to: Eerbeekseweg 4, Loenen https://maps.app.goo.gl/awWbkpVZJVzxmX859 **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://betaalverzoek.rabobank.nl/betaalverzoek/?id=eSkpxZf7TymaoFsvJkBCKQ * 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.

Join us every first Friday of the month to hang out and have a drink. Start off the weekend in a fun way :) Meet familiar faces or some new people, especially if you're new in town. Join us in En Public, a spacious bar/restaurant in Griftpark (near the canal bridge), at the former location of Peter's Bistro. If you can't make it on Friday, try joining Mingle Mania Tuesday drinks. For even more socializing and events in Utrecht, join our [WhatsApp community](https://chat.whatsapp.com/GopSuzuFKRBKeYVKQrX4pE). Feel free to visit our [website](https://utrechters.net). We (your event hosts) are proud to organize this gathering as volunteers, free of charge and without any financial profit for ourselves, with the intention of strengthening local community and that everyone has a nice time. With that in mind, please note that it is nice to support the venue by ordering a drink. We greatly appreciate if you settle your bills at latest by the end of the evening.

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!

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!

Where innovation meets practicality. Join us in **Columbus, OH** for our **immersive event** featuring dynamic, audience-driven demonstrations showcasing the groundbreaking features of our software. We'll cover a wide range of topics, from Manufacturing and Accounting to Inventory Management, Sales/CRM, and eCommerce, as we **delve into the capabilities of Odoo 19**. Discover how it can transform your business processes and support your journey towards digital transformation! Attend for FREE -[ ](https://www.odoo.com/r/dKG)**[Register now!](https://www.odoo.com/r/QU4)** For any inquiries, feel free to reach out to us at ellee@odoo.com

Odoo Academy is a series of **one-day**, **FREE training** sessions where participants can learn directly from our **seasoned experts**. Master a specific **Odoo application** or delve into **industry-specific** functionalities. Join us in our **Columbus, OH** for hands on training in Odoo's Accounting app and take your business to the next level! Training will be given in **ENGLISH**. Lunch is **included**. Participants must bring their **OWN laptop** for the practical exercises. For any inquiries, feel free to reach out to us at ellee@odoo.com. [Register Here Now! ](https://www.odoo.com/r/8yd)**[\[](https://www.odoo.com/r/gO9)Limited Seats Available!]**

Interested? Contact Preston Moore k.preston.moore@gmail.com 614-300-5989 ———————————— Engaging in men’s work is the new way to forge friendships while being open-minded to personal growth. Many men experience healthier relationships, personally and professionally, by engaging in this work. Open Men’s Group is a container for men to share vulnerably without receiving judgment or feedback. We believe that emotionally mature, powerful, compassionate, and purpose-driven men will help heal some of society’s deepest wounds. We support the powerful brilliance of men and we are willing to look at, and take full responsibility for, the pain we are also capable of creating – and suffering. We care deeply about men, our families, communities, and the planet. Visit ManKind Project USA to discover more. https://mkpusa.org/

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