Open Data

⚠️ **Important Note:** *PyData Amsterdam is transitioning to Luma.* ✨ * *Please [subscribe](https://luma.com/pydataamsterdam?k=c) to PyData Amsterdam on Luma:* https://luma.com/pydataamsterdam * *And register at the Luma [link](https://luma.com/go3keixu) for this event :* https://luma.com/go3keixu \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- Mark your calendars for our upcoming **PyData Amsterdam meetup on** **Thursday, June 4, 2026**! We are heading over to **Company.info** for an evening dedicated to the gritty reality of scaling data infrastructure and applying rigorous engineering to MLOps. As data platforms grow, so do the bottlenecks. This edition is all about tackling those growing pains head-on. We are going to look under the hood of high-performing data teams to see how they keep their pipelines fast, reliable, and organized at scale. Expect real-world case studies on slashing integration test times during a complex Databricks migration, alongside a deep dive into enforcing architectural standards across sprawling dbt projects using custom Python-based linters. If you build, maintain, or scale data pipelines, whether as a Data Engineer, ML Engineer, or Data Scientist, this session will equip you with actionable strategies to optimize your daily workflows and tame architectural chaos. Ready to level up your engineering toolkit? Join us for an evening packed with hard-earned technical insights, great food, and excellent networking with the Amsterdam data community! **Agenda:** * 18:00 - 18:55: **Welcome** with food and drinks! * 18:55 - 19:00: Intro **Company.info** * 19:00 - 19:45: Talk 1: **Scaling our Integration Tests Workflows in Databricks** \- by *Douwe Oosterhout* * 19:45 - 20:00: Short break * 20:00 - 20:45: Talk 2: d**bt-bouncer, a linter for dbt projects** \- by *Pádraic Slattery* * 20:45 - 21:30: **Networking + drinks** Talk 1 : **Scaling our Integration Tests Workflows in Databricks** *By* Douwe Oosterhout Talk Summary: As the number of workflows grew, so did the time spent waiting for integration tests to finish. What started as a minor inconvenience gradually became a significant bottleneck, directly impacting our team's development velocity and ability to ship changes quickly and confidently. When it became clear that the status quo was no longer sustainable, we knew we needed a smarter approach; one that could scale alongside our growing codebase without sacrificing reliability. In this talk, we'll walk you through how we dramatically reduced integration test runtimes, making our feedback loops faster and our developers happier. The journey wasn't without its complications, however. Our efforts were made more challenging by the fact that we were simultaneously migrating our traditional workflows to Databricks Asset Bundles, an extra hurdle that forced us to adapt our approach along the way. We'll share how we navigated both challenges at once and what we learned in the process. Bio: Douwe Oosterhout is Lead Data Engineer at Company.Info. He is the technical team lead of the Dutch Organization team, which processes a significant part of Company.Info's data. Besides building pipelines, he also works on making the data platform more accessible for others. Talk 2 : **dbt-bouncer, a linter for dbt projects** *By* Pádraic Slattery Talk Summary: As dbt projects continue to grow in size and complexity it is becoming increasingly common for each organisation to have its own conventions, standards and ways-of-working. But how can these conventions be maintained as the dbt project continues to expand? Does chaos reign or can we use our engineering knowledge to maintain our conventions? This talk explores the use of dbt-bouncer, an open-source Python CLI that aims to allow dbt developers to encode and configure their own dbt conventions. Bio: Pádraic Slattery is the Lead Field CTO at Xebia Data working in analytics, data engineering and Business Intelligence development across various industries. He helps clients at Xebia Data deploy data platforms, onboard business use cases, and improve employees' data literacy. His main areas of interest are DataOps and building robust data ingestion pipelines. **Directions** 📍 **Finding Company.info** - **Address:** Abram Dudok van Heelstraat 2, 1096 BE Amsterdam. Just a 5 min walk from the Overamstel metrostation.

**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/)

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!

**🙂 This is an in-person event 🙂** **⚠️ (Ideally) Register on [LinkedIn](https://www.linkedin.com/events/7429445270809112576/):** [[https://www.linkedin.com/events/7429445270809112576/](https://www.linkedin.com/events/7429445270809112576/)] *** We’re hosting another panel discussion—but this time, we’re talking about the elephant in the room that nobody likes to bring up! **Let's be completely honest: managing data incidents and building on-call rotations isn't sexy.** It is not a shiny new framework, it is not a trendy buzzword, and it definitely does not bring back fond memories. Instead, it usually reminds us of stressful 3 AM pages, silent pipeline failures that went unnoticed for months, and tense debates over who actually "owns" a broken dataset. **Because it is messy and stressful, companies rarely talk about it openly.** But at this event, we are finally pulling back the curtain. **We will go behind the scenes to see how different companies actually handle production data failures in real life,** so you can bring practical tips and hard-won strategies back to your own team. *** ### **Some of the things we’ll cover:** * **Defining the mess –** Drawing the line between a minor data quality issue and a true incident, and deciding who actually owns the fallout when pipelines and models break. * **Detection, observability, and the role of AI –** How teams spot silent failures, combat alert fatigue, and how emerging AI tools are actually being integrated into incident detection and management. * **The honest reality of being on-call –** A look at how rotations are structured, how teams handle escalation paths, and a candid discussion on on-call burnout in data teams. * **Response, recovery, and blameless culture –** What happens in the first 30 minutes of an outage, how to rebuild stakeholder trust, and how to run postmortems that lead to lasting, systemic changes. *** ### **🎤 Meet Our Speakers** We’ll hear from three data professionals working in very different industries, each bringing their unvarnished stories of production data failures—and what they learned from them. * **Rodel van Rooijen –** VP Engineering, Data & AI **@Palm** * **Katalin Nagy –** Data Platform Engineer **@Adyen** * **David Robinson Hayes –** Senior Manager Data & ML Engineering **@Catawiki** **🎙️Moderator: Başak Tuğçe Eskili -** ML Engineer **@[Booking.com](http://booking.com) &** Co-founder **@Marvelous MLOps** *** ### **Why Attend?** * **✨ Get the unvarnished truth:** Hear the behind-the-scenes stories and painful mistakes that are usually kept quiet. * ✨ **Go beyond the hype**: Skip the slide decks and join an open, practical conversation about what works and what doesn't. * ✨ **Bring home actionable tips**: Walk away with concrete strategies to improve your team's alerting, on-call setup, and incident response. *** ### **🍕🥤 Practicalities** * **✔** Drinks & Pizzas (yes pizzas 🍕!!) provided * **✔ IN-PERSON ONLY** (Because real, honest conversations about stressful topics are best had face-to-face!) * **✔** The panel will open into a broader discussion with everyone attending—your own stories, questions, and 3 AM nightmares are highly welcome! **🚨 Limited Spots Available!** To keep the discussion interactive, space is limited. RSVP now to secure your seat. We look 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!

## **Join us on June 4th for an intensive, hands-on bootcamp co-hosted with Databricks.** This session is designed to take you from the fundamentals to a deep understanding of the Lakehouse paradigm, all while working directly within a Databricks environment. Whether you manage a data team, build data products, or are looking to solidify your technical foundation, this bootcamp offers the perfect blend of theory, practice, and networking. #### **What’s on the Agenda?** The Databricks vision: A deep dive into the Lakehouse paradigm and platform breadth. Hands-on Lab: Get under the hood of a live Databricks environment. We’ll cover workspace navigation, basic exercises, and industry best practices. Official Accreditation: You will have the opportunity to take the Lakehouse Fundamentals Accreditation on-site. Expert Q&A: Get your specific questions answered by the Databricks experts in the room. Networking: Connect with fellow customers to share insights and build local collaborations. #### **The Essentials** 📅 Thursday, June 4th ⏰ 8:30 AM – 4:30 PM 📍Turbinetanker, Tt. Vasumweg 44, 1033 SC Amsterdam ⚠️ Important Registration Note ⚠️ To ensure the best experience for our community, all registrations will be initially waitlisted and screened. Please ensure you register with your professional email address. Secure your spot on the waitlist now and get ready to master the Lakehouse! https://events.databricks.com/databricks-fundamentals-revodata/waitlist

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.

*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/)

'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

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!

* 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.

Do you love books, or have you been wanting to get into reading more? Then this might just be the event for you! At this book swap everyone brings one or a few books they no longer need. We put them all out on the table and from there it's up to you, see if something catches your eye and take home whatever you'd like to read next. Any language is welcome, so bring whatever is sitting on your shelf! At the end of the meetup you can take back the books you brought that weren't picked up, or leave them with the organiser who will donate them to a local secondhand shop. ⚠️ If you're unsure whether you can make it, please free up your spot for someone else.

**The Behavior Gap: Where Products Win or Lose** Teams today have more data than ever, and yet many still struggle to understand why customers adopt, engage with, or abandon their products. Teams sprint, ship faster, and chase more signals… all while metrics stall and confidence drops. The missing piece isn’t more data. It’s often the behavioral insight between the metrics, explaining why the numbers move in the first place. Dashboards can tell you what customers did, but understanding why they did it (and how to influence what they do next) requires a deeper blend of insights. This session is about closing that gap. Drawing from real-world experience designing and scaling products as [ZoCo Design](https://zocodesign.com/)’s CEO, [Lacey](https://www.linkedin.com/in/laceypicazo/) will share how to cut through the noise and identify the insights that actually change behavior—moving people, and moving metrics. You’ll learn: * Why understanding customer behavior is a quant and qual challenge * How to spot the signals that actually predict behavior change * Where AI accelerates insight, and where it creates distraction * How to get meaningfully closer to customers, without adding more tools This talk reframes how to evaluate performance and identify what levers actually improve it, helping your team to make smarter bets with greater confidence. Every meaningful outcome is driven by behavior change. And when you know how to design for behavior, you stop guessing, and start building things that work. **About Our Speaker** [Lacey Picazo](https://www.linkedin.com/in/laceypicazo/) is the Founder and CEO of ZoCo, a healthcare product studio that turns complex, high-stakes ideas into products that drive real-world adoption. She partners with healthcare organizations to uncover critical care delivery insights, focus product strategy through behavior design, and build solutions that patients and providers actually use. Thanks to our 2026 sponsors: [Clarivoy](https://www.clarivoy.com), [What Box Consulting Group](https://www.whatboxconsultinggroup.com), [Conductrics](https://www.conductrics.com), and [Piwik PRO](https://piwik.pro) More info at [cbusdaw.com](https://cbusdaw.com)

**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

Topic to be announced. **THANK YOU** *Franklin University* for hosting our meetup! To learn more about *Franklin University*, please visit their website: https://www.franklin.edu/ **DIRECTIONS** Franklin University Fisher Hall 300 E. Main St, Columbus, OH 43215 Map: https://maps.app.goo.gl/jxjBA2hUmS5qrvhq8 Parking is FREE! Please park in Lot C in front of Fisher Hall. See attached map. NOTE: Map the address only. When mapping with Google Maps it may use the Fisher Hall at OSU, which is NOT correct. **Want to sponsor the pizza and/or bar tab?** Please contact me if you would like to sponsor this meetup's pizza and/or bar tab: angelo@mandato.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. So please RSVP for a head count!

Click Here For More Videos: https://www.facebook.com/share/r/17bwkttXhV/ *********************************** Salsamante Dance Academy will be at Swerve Every Tuesday Night to share the Rhythm & Energy of Bachata & Salsa. These are Beginner Level lessons to get you comfortable and understand the two dances. Spread the Good News to all. Swerve Dance & Fitness Complex 640 Lakeview Plaza Blvd A, Worthington, OH 43085 Bachata 7pm-8pm Salsa 8pm-9pm $15 - One Lesson $20 - Both Lessons