Scala

Donderdag 21 mei 2026 is het weer tijd voor onze Techday: hét vaste moment waarop we kennis delen, elkaar inspireren en nieuwe ideeën direct in de praktijk brengen. Deze editie pakken we het aan als een conferentie in het klein. Drie sprekers, drie verhalen, één middag – drie verhalen voor de prijs van één. Wat kun je verwachten? **Dirk neemt een kijkje onder de motorkap van AI** AI voelt voor veel mensen als magie. In deze talk probeer ik de magie weg te nemen door een kijkje te nemen onder de motorkap. Een essentieel bouwblok van moderne AI is een neuraal netwerk. Als je begrijpt hoe een neuraal netwerk werkt, is het een stuk makkelijker om te begrijpen hoe en waarom een LLM werkt. De beste manier om iets te begrijpen is door het te bouwen, vanaf scratch. Dus dat gaan we in deze talk doen. Door dat te doen leren we over artificial neurons, activation functions, backpropagation en meer. **George vertelt hoe AI Cyberaanvallen verandert** George Schizas (extern), voormalig IT Manager, nu werkzaam als CISO, vertelt over zijn ervaringen in de Cloud Cyber Security en hoe hackers met behulp van AI nieuwe aanvalsmethoden kunnen gebruiken om kwetsbaarheden op te sporen en te exploiteren. Hij geeft voorbeelden van manieren om in Kubernetes omgevingen in te breken en noemt manieren om dit tegen te gaan. **Roland duikt in de wereld van de fraude fabriek** Als ontwikkelaar kom je dagelijks in contact met technologie en de laatste jaren natuurlijk ook vaak met AI. JIJ snapt heel goed wat de voordelen en de gevaren zijn, maar hoe leg je complexe onderwerpen als AI gegenereerde afbeeldingen, Voice Phishing en Hallucinaties uit aan je ouders, de buurvrouw, of je kinderen? Ik neem jullie mee in een realistische situatie waarin Anna en haar familie opgelicht wordt met behulp van verschillende technieken en hoe dit oplichters-landschap met behulp van AI verandert. **Wanneer:** Donderdag 21 mei 2026 **Wat:** Techday – conferentie-editie “AI kansen en valkuilen” **Voor wie:** Iedereen (!) die nieuwsgierig is en wil leren **Agenda** 14:45 - 15:00 - Inloop 15:00 - 16:00 - Neurale netwerken 16:15 - 17:15 - AI risico’s en kansen 17:15 - 18:00 - Eten 18:00 - 18:45 - Fraude fabriek We zien je graag op de Techday!

**RSVP here via EventBrite [here](https://www.eventbrite.nl/e/you-and-your-brand-a-casual-networking-hour-tickets-1984283125243).** Expand your visibility. Join a casual online time to share about you, your brand and business, and learn more about other business owners, locally and globally. Share upcoming events and workshops, too. After each business owner gets the spotlight to share, we then move into a topic-oriented discussion. This month, the topic is begin chosen by [Isabella Maria Noguera, MSc](https://www.linkedin.com/in/isabellamarianoguera/) over of Be Your Brand Consulting. Every session closes with gratitude and a creative activity, so have a pen and paper, tablet, or something available in case we write/create/draw. **RSVP here via EventBrite [here](https://www.eventbrite.nl/e/you-and-your-brand-a-casual-networking-hour-tickets-1984283125243).** *-* *\*\*\*The only requirements are a minimum age of 18 years old, be a business owner or preparing to launch,* *and **at least three attendees** register to make it a worthwhile hour for everyone.\*\*\**

We’re excited to welcome everyone attending RustWeek 2026 for another collaborative day of coding! This year, we’re partnering up with [Zed](https://zed.dev/) and [Kiesraad](https://www.kiesraad.nl/) (Dutch Electoral Council) to bring you some fun challenges to hack on. Your friendly hackathon organizers are still pulling together details but we'll open the Discord channel soon with more details including hackathon tracks, prizes, and schedule for the day. And you will not be alone! * **From Kiesraad**, the Electoral Council’s Abacus engineers will be on-site to collaborate with you on software for election results and seat allocation, with several good first issues and challenges, and they would love your input and proof-of-concept ideas! * **From Zed**, we will have no less than seven devs from the Zed team ready to pair with you. This will be a great chance to get started with Zed (if you don't use it already), and work on some cool issues and projects together. You do **not** need a ticket to the RustWeek conference to attend the hackathon. The hackathon is free of charge; we will provide coffee, tea, lunch and refreshments. The hackathon will be held at Kinepolis, the same venue as the conference. Schedule Doors open: 9:00 Opening: 9.30 Hacking Begins: 10.00 Demos and wrap up: 6.00 We will keep you supplied with food and drinks during and after the hackathon. Looking for more fun things to do during RustWeek? Take a look at our activities page: https://2026.rustweek.org/events/social-activities/.

In a world where new frameworks, tools, and trends seem to appear every week, it’s easy to forget where true technical strength and innovation come from: the fundamentals. At Back to the Future of Code, we invite developers to **explore the foundational building blocks behind modern software**. Three speakers will each offer a different perspective on these fundamentals and highlight why they’re still at the heart of great engineering. Talks: 🎤 **Frontend Framework Dependency: Are we skipping the hard part** → Ramona Domen (Software Engineer and Impact Leader) Ramona shows how modern frontend frameworks still depend on HTML, CSS, and JavaScript. And why mastering these foundations makes you a more deliberate and powerful engineer. 🎤 **Why Great Engineers Don’t Just Write Code** → Sarah Gruneisen (Engineering Leader & Leadership Coach ) Sarah’s talk highlights how many engineers, especially women, have their strategic and technical strengths overlooked in favor of their “people skills”. She reveals how those very skills drive real technical impact and invites us to broaden our definition of engineering excellence. 🎤 **Women in Tech: Bug or Feature?** → Maaike Wachters (Software Engineer) Maaike uncovers the hidden history of female tech pioneers whose groundbreaking ideas laid the foundation for the way we code and innovate today. **Program** * 17:15 – 18:00 Walk in and dinner (vegetarian options) * 18:00 Intro WeCode and KVK * 18:20 Talks and Q&A (in English) * 20:00 – 21:00 Snacks and drinks **Who should attend?** This event is especially designed to spotlight and elevate women’s voices in tech by giving them a place on the stage. Everyone is welcome to join. **How to get there** KVK is located at Sint Jacobsstraat 300, 3511BT Utrecht. (KVK has two buildings on the same street, so look out for number 300) * By car: Paid parking is available at Q-Park La Vie or Paardenveld. * By train: The nearest train station is Utrecht Centraal, about a 10-minute walk. * By bus: Take lines 1, 3, 6, 7 or 27 to bus stop Sint Jacobsstraat. * By bike: There are bike racks available close to the location. You need to bring identification because we're in a goverment building. (ID-card, drivers license, passport). **Change of plans?** Please cancel your RSVP so someone on the waiting list can take your spot. Thank you! **Photography** We will be taking photos during the event to capture the atmosphere and share highlights afterward online. If you’d rather not be photographed, let our team know. **Questions** If you have any questions or need special accommodations, please contact us at wecode@kvk.nl.

We’re back! On **May 21st**, PuXu returns to Acato in Utrecht for a meetup dedicated entirely to **Research**. **Speaker 1: Emmanuelle Savarit** Emmanuelle is a UX researcher with 20+ years of experience. She's built and led research teams at Facebook, Just Eat Takeaway, LSEG (Refinitiv), and Thomson Reuters. She ran her own UX research agency for 10 years. She's written two books, hosts the UX Research Club podcast, and now focuses on helping researchers increase their strategic impact, including navigating AI. In short: she knows what it takes to move research from tactical to strategic, and she's coming to Utrecht to talk about it. **Special Offer:** Emmanuelle is the author of *The UX Research Powerhouse*. As a PuXu attendee, you can [pre-order your copy](http://clicks.meetup.com/ls/click?upn=u001.NY3oBFzZ5LJDG7YcnfSAKt-2FPbu0mdbClRwu8GKKRoO80nKlP-2FLm90aUF5CQqytHZ3qPz_74u5-2F-2BkTZmgMdnIu03cC4mmjtImPovdZ1zhiEax5tCGl-2BX4fyxb41gNAMGCWV5p-2F3ZXnrHzXrYb-2FEX1gm6iU0hCqBeZf0X8TDiJ-2FF2Pb5b0AYKY0z73yUDJwsJeyVUq2KtnZTX6IPrsDNa2UkzczY3hKG3S2HRTZ-2F-2F-2B5qIwx3CPXatPQFxQ52SkLNZ5jtWr2BsPEXqg9XUqI4UVveDZFOzr6Jpxsj6HpP5WPTNn9JfRQGsEK6lvy8Funa0EQyQ5-2Fcs-2B47BimpzF-2BEXne3mS-2BZNzrupqrFFi2fX4yIrWqpynPk6sL8GL1wQYphmXVe60iss42yhd4nNcrL3QnxXpmXREmBBaQDTLdBvlEgh-2BlmcKlZdw6YOLqURK9zvY-2FZT5KaZSep0LjLq0ckOBsBXggyUAiy01ioYfPSic9ypG0U9487DG53iY3jWQMuNSrHZokvJpDhdJ90J3JwMV8sFus1jAghL1xl0LlFTEJpqn6t0IDZ1Yply0uZ5X2veN2tA6ExM9KeLmTIDEk7ps7HLzVl7BhlE3HPR0nzpsaeXQjsAOoU-2BnH0eHPtBMoFi4jTJ-2BzcDaUWHmnZT1Xq5B2aktBwrvpQR2rC-2B2F3HcHTn3UrTwP8UrRAlyo7TVk8S34miQEhNN6-2BmmpLC1LwWfU-2FC5CHRq0sQuuBynnS2qztg0oS1no5qCyhZ0QvtvBawQvEzT9) at a **15% discount** and get it signed during the event! **Speaker 2: Sabine Bakker** Sabine is an inclusive user research consultant at the Accessibility Foundation, supporting organizations with making their products and services accessible for users of all (dis)abilities. She knows the challenges that UX teams face in demonstrating their added value from her 10+ years of experience at the tech start-up Blendle, cybersecurity scale-up Zivver, and low-code SaaS Mendix. She now helps teams with gaining a competitive edge through inclusive research and co-creation “from a to y”. Her talk will point you to the importance of user experiences that are not reflected in the training data of LLMs and the “curb cut”-effects to be gained which no synthetic persona will provide. **Speaker 3: Bo Kusters** Service Designer at the Dutch Tax Administration. With millions of users, the team often sees the same generic functional and emotional needs recurring in their user research. To avoid reinventing the wheel every time, they developed an interactive, tarot-style card game. With this clever deck, they make complex user insights tangible, allowing internal teams to apply this data directly in their daily work. Learn during this session how to successfully translate abstract research data into a practical design tool that actually works for your team. **Event details** **When:** May 21 \| 18:30 – 22:00 **Where:** Acato, Oudegracht 231, Utrecht **Cost:** Free \(Includes snacks & drinks sponsored by Visma \| ProActive\) **Capacity:** 50 spots Stay tuned for more updates! Later this week, we’ll also share our *Utrecht Visitor Guide* for those traveling in to make a day of it. See 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!

Come discuss books and make new friends 🌈✨ How the meeting works: While we are waiting for everyone to arrive, we have tea and get comfortable. Once most of the group is seated (please aim to arrive on time to help with this!) we go around introducing ourselves. From there we have a loosely structured discussion that can go in whatever direction feels natural. Once we've talked about everything we want to related to the book we often hang out for a while later to chat about unrelated things. For May we will be discussing He, She and It by Marge Piercy. This one is unfortunately not available at the library, but is available to purchase on several websites. In the middle of the twenty-first century, life as we know it has changed for all time. Shira Shipman's marriage has broken up, and her young son has been taken from her by the corporation that runs her zone, so she has returned to Tikva, the Jewish free town where she grew up. There, she is welcomed by Malkah, the brilliant grandmother who raised her, and meets an extraordinary man who is not a man at all, but a unique cyborg implanted with intelligence, emotions--and the ability to kill.... The meeting will take place at De Uithoek handarbeidlokaal, an 8 minute cycle / 20 minute walk away from Utrecht Centraal. Everyone is welcome who has read the book (or DNF, and is okay with spoilers) by the time of the meetup. The book club is hosted in English. Please update your RSVP if you find out you cannot attend. Hope to see you there! 🏳️‍🌈📚

**Please note: the new name of the bar is GOTO. On Google Maps it's still Bloemerbar.** **Join us for Maytime Drinks for Expats & Locals!** The days are getting longer, the weather is warming up, and it’s the perfect time to meet new people! ☀️ Join us for Maytime Drinks for Expats & Locals and enjoy a laid-back evening of great conversations, cultural exchange, and new friendships. **What to expect** * A lively and inclusive atmosphere to enjoy good company. * Conversations with a diverse mix of locals and internationals. * A laid-back evening of cultural exchange, friendships, and fun. **Who should join** * **Expats** looking to expand their social circle and make new friends. * **Locals** eager to share their culture and connect with an international crowd. * **Anyone** looking for a relaxed, social evening filled with great energy and good vibes. Don't miss out - **RSVP now** and join us for an unforgettable evening! Join the WhatsApp group: brand.page/expatslocalswhatsapp Follow us on Instagram: instagram.com/expats.locals Become a Welcomer: https://www.expatslocals.com/become-a-welcomer

Come along, lovely queer hikers! 🌿✨ This time we’re serving an easy-going queer nature moment with a short loop through **Landgoed Heidestein** near Zeist. Think dreamy forest paths, shimmering fens, a peaceful forest pond, and heather fields - a lot of diversity for such a short walk :) We’re teaming up with **Cocktail (COC’s group for LGBTQIA+ refugees & asylum seekers)** for this event, so besides soaking up nature, we’re creating space for connection, sharing stories, and learning from each other’s journeys and experiences. Expect a vibe that’s part hike, part picknick, part wholesome community exchange. 🌈 Bring your snacks and blankets, as we’ll pause along the way for a relaxed picnic moment together. Because queer joy isn’t just about where we go, but who we walk with. 💖 **Practical info** 📏 **Distance:** 5 or 7 km (loop walk) 📍 **Start:** Bus stop Prinses Margrietlaan, Zeist (5km option) Driebergen-Zeist station (7km option) 🏁 **End:** Back at the starting point 🥾 **Level:** easy - chill pace 🤝 **Meeting point:** outside the train station **Driebergen-Zeist at 13:45** or bus stop **Prinses Margrietlaan (Zeist) at 14:20** ❗You’re welcome to join from another direction. If you come by car you can park at P+R Driebergen-Zeist. Please note: we published this hike with Cocktail simultaneously, which is also why we lowered the participant number from Hiking Queer NL's side. Pack your: 🍱 snacks 🚰 water 🧥 rain coat/umbrella ☀️ sun screen 🏳️‍🌈 anything else you might need ❌ If you signed up and cannot make it in the end, please cancel your RSVP attendance so we know how many people will show up and someone else can take your place instead. 💗 A voluntary donation helps us to keep the Meetup group up and running :) you can either pay via a Tikkie or in cash after we finish the hike. *Hiking Queers Netherlands & Cocktail (COC)*

We're doing another city escape! Please note that we're gonna play a game. During the game we'll focus on that. After the game there's time to take pictures and have a drink. I have a discount, so it's +/- €5,- per person. Tickets are not refundable. Don't sign up if you're not planning to join. Join [our chat](https://chat.whatsapp.com/DtI6sOESSE797Q5dR1RzVG) to stay tuned.

(english/german below) **Bitcoin Pizza Dag!** Op 22 mei 2010 betaalde programmeur Laszlo Hanyecz 10.000 BTC voor twee pizza's — de eerste gedocumenteerde aankoop met bitcoin. Hij plaatste een bericht op een forum waarin hij BTC aanbood voor pizza; een andere gebruiker ging akkoord, bestelde de pizza's en leverde ze af. Die transactie werd later bekend als "Bitcoin Pizza Day". Laszlo bewees dat Bitcoin als ruilmiddel gebruikt kan worden. **Sluit je bij ons aan voor pizza-avond bij De Pizzabakkers! (vanaf 18:00)** RSVP zo snel mogelijk; we moeten reserveren bij De Pizzabakkers en er is beperkte plek. Zorg dat je je geladen Lightning-wallet meeneemt! *** **English: Bitcoin Pizza Day!** On May 22, 2010, programmer Laszlo Hanyecz paid 10,000 BTC for two pizzas — the first documented purchase using bitcoin. He posted on a forum offering BTC for pizza; another user accepted, ordering pizzas and delivering them. That trade later became famous as "Bitcoin Pizza Day," Laszlo proved that Bitcoin can be used as a medium of exchange. **Join us for pizza diner at De Pizzabakkers! (from 18:00)** Please RSVP as quick as possible as we need to make a reservation at De Pizzabakkers and there is only limited space. Be sure to bring your loaded lighting wallet along with you! *** **Deutsch: Bitcoin Pizza Tag!** Am 22. Mai 2010 zahlte Programmierer Laszlo Hanyecz 10.000 BTC für zwei Pizzen — der erste dokumentierte Kauf mit Bitcoin. Er postete in einem Forum und bot BTC für Pizza an; ein anderer Nutzer akzeptierte, bestellte die Pizzen und lieferte sie aus. Dieser Tausch wurde später als "Bitcoin Pizza Day" bekannt. Laszlo bewies, dass Bitcoin als Tauschmittel verwendet werden kann. **Begleite uns zum Pizza-Abend bei De Pizzabakkers! (ab 18:00)** Bitte antworte so schnell wie möglich; wir müssen bei De Pizzabakkers reservieren und es gibt nur begrenzten Platz. Nimm unbedingt deine geladene Lightning-Wallet mit!

Discover Utrecht on foot with our friendly tour guides! This tour will take place at 10:00 AM on Friday, the 22nd of May, and will take one and a half hours (until 11:30 AM). There are 35 spots available. The tour is free of charge for RustWeek attendees. The tour starts at Kinepolis (the conference venue). Feel free to join our Discord at https://discord.gg/FSwaWZdk6k if you have questions! Our Discord and the RustWeek website, https://2026.rustweek.org/events/social-activities/, offer more activities.

We'll start into the weekend with some Sport and what is better than having a bike tour on Friday 22nd May? If you'd like to bike along, sign up here! We expect this to take about 4 to 5 hours. On the route, we will see at least two beautiful castles, and we’ll have a pause in Breukelen where we will get a snack! **This tour is for everyone. You don't have to prepare anything, it's enough to be at the bike rental at the time.** The following information is for the curious: You can see the [tour](https://www.komoot.com/de-de/tour/2884792439?share_token=aCVbZHeYrkmmS52GP5uwrR7Q3EweCrOv65hA2MpYgtf4nSaL8V&ref=wtd) on the app [Komoot](https://www.komoot.com/). It's approx. 46km, **we may adapt it as a group on the day. As last year we’re very flexible and adaptive!** The bike rental is payed by Stichting Rust Nederland. Many thanks to Erik Jonkers for the sponsoring and to Jana Dönszelman for helping with the meetup page and organization. **Agenda** 1. We'll meet at the bike [rental place](https://willemstraatbike.nl/contact/) it is near to the conference venue. (5 Minutes by bike) 2. Everyone receives their bike. 3. We’ll go over “Hogeweidebrücke” 4. We’ll see Kasteel Nijenrode and get a snack at the marketplace of Breukelen 5. We’ll see Schloss Zuylen 6. We ride back to Utrecht and return the bikes! Looking for more fun things to do during RustWeek? Take a look at our activities page: [https://2026.rustweek.org/events/social-activities/](https://2026.rustweek.org/events/social-activities/)

**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

**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** TBD

Bring your work or your hobby, hang out, and code with us. Follow @buckeyecocoa for more information.

Welcome, readers! Our May read is **_Kindred_ by Octavia E. Butler.** The story follows Dana, a Black woman living in 1976 California, who is suddenly pulled back to a Maryland plantation before the Civil War. She learns her survival is tied to a white slaveholder’s son. Forced to move between centuries, she must endure the brutal realities of slavery while fighting to hold on to her identity. Tense, intimate, and unforgettable, Kindred explores how the past refuses to stay buried. Looking forward to discussing with everyone! We will meet at Zaftig Brewing Co in their event room in the back. We are welcome to bring in our own food, but **drinks must be purchased at the bar.** Happy reading! 📖

Join us as we get together to see Paul Rudd in the latest comedy-drama-musical from John Carney, POWER BALLAD! The film follows a washed-up wedding singer, a fading boy band singer and a stolen hit song. Here’s a description, trailer and plan for this event: DESCRIPTION: Rick, a washed-up wedding singer, and Danny, a fading boy band star, bond over music and a late-night jam session. When Danny turns Rick's song into a hit, Rick sets out to reclaim the recognition he believes he deserves. Power Ballad is written/directed by John Carney, the master of the modern musical and creative mind behind Once, Begin Again and Sing Street! It stars Paul Rudd, Nick Jonas, Peter McDonald, Marcella Plunkett, Havana Rose Liu and Jack Reynor. BUZZ & ACCLAIM: The film premiered to rave reviews at this year’s Dublin International Film Festival where critics call it “a sure-fired crowd-pleaser” that “just might be the feel-good hit of the year!” Others say, “Paul Rudd delivers a career-best performance in this charmer” that’s both “hilarious and deeply moving!” SUMMER OF ICE CREAM, VOL 2: SHAKE NO. 8! Ranked the #1 Ice Cream Shop in Columbus in 2024, this is the perfect place to kick off our Summer of Ice Cream and grab a sweet treat after the show! Their menu features an array of traditional, specialty and vegan shakes, hot cocoa, and more! You can check out their full menu here: [https://www.shakeno8.com/menu.php](https://www.shakeno8.com/menu.php) PLAN: We’ll plan for a 7pm-ish showing and will meet in the lobby area about 20 minutes before the show. Once showtime is announced, advance ticket purchase is advised! Once you have yours, please list your seat number in the Comments section of this event. We'll head to nearby Shake No. 8 immediately following the show! Should be a fun one, Dan