Payment Systems

Dear Kotlineers, After a slightly longer break than planned - we are back! This time we meet in the chambers of **voize GmbH** \- one of Berlin's \(if not the\) most flourishing startups\. As the flowers open and the days stretch long, we're dancing into May with some talks. **Line-Up:** 👉 **Coroutines behind the scenes** by *Sergey Shkurov* Have you ever wondered how Kotlin coroutines actually work under the hood? In this talk, we dive into the JVM bytecode behind suspend functions and reconstruct the state machines step by step. You’ll follow a hands-on exploration of real compiled code and see how continuations and suspension actually work. 👉 **YOUR TOPIC HERE** by *TBD* **Speaker Bios:** 🗣 *Sergey Shkurov* A Kotlin enthusiast since 2019. 🗣 *YOUR NAME HERE* TBD

A social evening designed for people who want more than small talk. We bring together 20+ founders, builders, and operators from AI, product, and tech — across different nationalities — for a structured format that actually leads to real conversations. The format: * 18:00–18:30 · Arrive & mingle freely * 18:30–19:30 · Same-industry conversations * 19:30–20:30 · Cross-industry conversations * 20:30–21:00 · Open floor The structure is light — no forced icebreakers, no pitching. Just a framework that makes it easier to find the people worth talking to. 📍 Spreegold Mitte, Neue Grünstraße 18, 10179 Berlin 🗓 Thursday, April 30 · 18:00–21:00 Capacity: 30 people Spots are limited — register to secure yours.

We're thrilled to welcome you to the Berlin Ethereum Meetups! Join us as we explore technical and non-technical topics and new ideas, collaborate on projects, and connect and grow our community! Our meetups are open to all - from those new to Ethereum to long-standing community members and developers. 🗓️ **Agenda** *(subject to change)* 🕕 6:30 - 6:45 pm - Arrivals 🕡 6:45 - 7:00 pm - Ecosystem & Community Updates by Eniko (Ethereum Foundation) 🕡 7:00 - 7:20 pm - Building a Truly Trustless Ethereum Wallet for Android by Dirk Jäckel (independent developer) *Every Ethereum wallet you've ever used secretly trusts a server, and they all silently query centralized RPC providers. This talk presents a different approach: an Android wallet library that eliminates the RPC dependency entirely.* 🕖 7:20 pm - 9:00 pm - Open discussions and community networking 👩‍💻 Full Node is also excited to offer free coworking for all event attendees on the day of the meetup, starting from 9:00am. Feel free to come by Glogauer Str. 6 early and get some work done! Berlin is one of the most vibrant hubs for Ethereum builders, researchers, and advocates of privacy, decentralization, and open-source technology. Whether you’re here to learn, contribute, or simply connect, join us as we continue building the next chapter of Ethereum in Berlin. The talks will be recorded and uploaded to our [Youtube channel](https://www.youtube.com/@ethereumberlin). Subscribe to stay up to date! Apply to speak at our future meetups: [Speaker Application](https://forms.gle/5y9Y5ywZC7pSEqpV9)! The event is sponsored by [Gnosis](https://www.gnosis.io/). To learn more about Ethereum, go to [ethereum.org](http://ethereum.org/) (content available in many different languages).

We are excited to announce our next meetup, which will again be hosted at the beautiful [HubSpot](https://www.linkedin.com/feed/#) Berlin offices. Get ready for rooftop views, snacks, drinks and plenty of opportunities to learn and share. Agenda: • 18:30 – 19:00: **Arrival and Registration** • 19:00 – 19:15: **Welcome & Opening Remarks** • 19:15 – 19:45: **Impulse talk** on "Challenges of measuring ROI in AI projects" from Stefan Kiefer, VP Customer Experience at Octonomy AI • 19:45 – 20:30: **Panel Discussion** with **Dr. Katharina Prohl-Schwenke**, author of "Customer Success Management" (Springer Professional) & Co-Founder of the CustomerSuccess Academy, **Julian Janecke**, Head of Customer Success at nilo and **Stefan Kiefer**, VP Customer Experience at Octonomy AI. • 20:30 – 21:00: **Networking** A heartfelt thank you to our friends at **HubSpot** for providing the location & Drinks. Food will be provided by **addressable value**. Expect an exciting and engaged discussion and feel free to bring questions of your own.

**Join us for our next Machine Learning in Healthcare meetup in Berlin — proudly sponsored by the QUEST Centre!** Pizza is still back! Yes, we fought for it in 2025, and we continue to do so in 2026. Come hungry. We are very happy to announce our speaker **Prof. Grégoire Montavon**, who is a Professor at Charité Universitätsmedizin Berlin at the Institute of AI in medicine (IKIM) and a Research Group Lead in the Berlin Institute for the Foundations of Learning and Data (BIFOLD). He received a Master's degree in Communication Systems from the École Polytechnique Fédérale de Lausanne in 2009 and a Ph.D. in Machine Learning from the Technische Universität Berlin in 2013. His research focuses on methods and applications of Explainable AI (XAI). A particular goal is to develop approaches that integrate well with state-of-the-art machine learning (ML) models used in medical diagnosis and research, so that these models can be verified and explored for insights. **His talk´s title is:** **Tackling Imperfect Data Environments via Robust and Explainable AI** **Abstract:** In this talk, I will present novel techniques for learning in imperfect data environments, specifically addressing challenges such as mislabeling and spurious correlations. Central to these new approaches is the design of new loss functions and Explainable AI techniques that can isolate artifact-inducing components during or after training, allowing them to be systematically removed from the final model. *** 📍 **Location:** “Atrium” conference room, 5th floor, Spreepalais, Anna-Louisa-Karsch-Straße 2, 10178 Berlin 🕕 **Doors open at 6:00 pm** — Talks start **at 7:00 pm!** * 6:00–7:00 pm — Arrival, food, and networking * 7:00 pm — Welcome by the hosts, followed by the talk + Q&A * 8:00 pm — More networking (and possibly more pizza) ⚠️ *Pro tip:* Sometimes only one of the four elevators is working! 📢 **IMPORTANT:** If you RSVP but later realize you can’t make it, *please release your spot* so others can join. *** This meetup is made possible with the kind support of the **QUEST Centre for Responsible Research at BIH**, who are providing both the venue and the delicious refreshments. We look forward to seeing you there!x

This event takes place in **Schöneberg**! Meet us at 6:00pm at the Mittelpunktbibliothek Schöneberg in the Haupstraße 40 (enter the park, and it's on your left). **Agenda:** 18:00-18:10 - *Arrival, greetings, warming up* 18:10-19:10 - *Quiet reading* 19:10-20:00 - *Chatting and sharing thoughts about our books* Can't wait to read with you guys! L&F

Hello everyone, After a great restart last month, we’re happy to invite you to the next Rust Berlin meetup at the JetBrains office. We’ll stick to the classic format: an evening with two main talks, followed by time to connect, discuss, and catch up with the community. Finger food and drinks will be available throughout the evening. **Agenda** * Doors open: 18:30 * Start: 19:00 * Short welcome and updates from JetBrains * 2 talks (20–30 minutes each) * Open mic / lightning talks (optional, a few minutes each) * Networking **Speakers** Egor Lebedev - Welcome and a short note from the RustRover team Till Adam - Slint-MCP In this talk, Till will walk you through the implementation of the MCP server for the Slint GUI framework - and how it's implemented in Rust. He will walk you through the implementation from design to implementation. Gaurav Gahlot - Rust meets Kubernetes This talk is a hands-on walkthrough using kube-rs. We'll connect to a cluster, query pods, watch real-time events via async streams, and build a minimal controller - all in Rust, all running live. **Speaker Bios** Till Adam is the CCO at KDAB and has been working on open-source since the 90s. Originally a C++ company, KDAB has been working with Rust for the last 8 years. One of their biggest projects is CXX-Qt. Their specialization on the Rust side is use in hybrid, high-performance, high-correctness codebases. Gaurav Gahlot is a Software Engineer with experience building scalable platforms with Go, Rust, and Kubernetes. He maintains the CNCF Akri project and actively contributes to open source. **Open mic & future talks** We’ll reserve a few short slots for anyone who wants to share something with the group. This can be a quick idea, a project, or an experience. Slides are optional. If you’re interested in giving a longer talk at a future meetup, this is also a good opportunity to connect with the organizers. **Venue & access** Please arrive on time. We will have someone at the entrance to let people in between 18:30 and 19:15. After that, access becomes more difficult as the doors are locked and require manual opening. **Registration** The venue has limited capacity and events typically fill up with a waiting list. If you register and can no longer attend, even at short notice, please un-RSVP so someone else can take your spot. Looking forward to seeing you all!

**Das Treffen ist offen für w/m/d Personen.** Die Selbsthilfegruppe Berlin Prenzlauer Berg findet in der Regel am ersten Sonntag im Monat von 15:00 bis 17:00 statt. Zum Thema: **Wellenreiten statt Untergehen – Gefühle verstehen und lenken** Schwierige Gefühle werden im Alltag oft unterdrückt oder als störend empfunden. Dabei sind Traurigkeit, Angst oder Wut essenzielle Signale unseres Systems, die uns auf unerfüllte Bedürfnisse hinweisen. **Die Schwerpunkte des Treffens:** * **Wahrnehmung schulen:** Emotionen frühzeitig erkennen, bevor sie uns kontrollieren. * **Die Botschaft entschlüsseln:** Gefühle als Datenquelle für persönliche Bedürfnisse verstehen. * **Resilienz stärken:** Methoden zur Regulation, um auch in stürmischen Phasen stabil zu bleiben. Wie können wir Distanz zugewinnen, ohne den Kontakt zu sich selbst zu verlieren? Zeit für alle, die ihre emotionale Kompetenz in einen echten **Ressourcenblick** verwandeln möchten. Mit Selbsthilfegruppen schaffen wir einen geschützten Raum für emotionale Entlastung und gegenseitige Unterstützung. Die Teilnehmenden begegnen sich wertschätzend und geben sich gegenseitig lebensnahe Hilfe. Durch den regelmäßigen Austausch werden Selbstbewusstsein und Selbstwertgefühl gestärkt und das soziale Netzwerk erweitert. Die Teilnahme an den Gruppen unterstützt dabei, ein individuelles Krisennetzwerk sowie einen persönlichen Krisenplan aufzubauen. Ergänzende Übungen helfen, bestehende Bewältigungsstrategien zu erweitern und den Umgang mit herausfordernden Situationen nachhaltig zu verbessern.

This week we are discussing **Deborah Levy:** August Blue. We look forward to seeing you! If you have book suggestions, would like to vote on our next reads, or join us for additional activities, please ask someone at the meeting to add you to our WhatsApp group. Just a heads up: **The cafe only accepts card payments for amounts over €10**, so you may want to bring some cash for smaller orders. **Also, if you're unable to attend, please update your RSVP so that someone from the waiting list can take your spot.**

Збираємо компанію людей з бізнес середовища: підприємці, виробники, менеджери, C-level, спеціалісти з досвідом у проєктах, операційці, маркетинг, комерція. Формат простий: гриль, знайомства, жива розмова про проєкти, досвід, ринки, настільні ігри, гітара, легка неформальна атмосфера без сцени і без формального нетворкінгу. Зустріч у суботу, 2 травня, о 14:00. Планується 15-20 людей. Можна прийти з другом. На борту вже близько 15 людей. Сфери: виробництво, HR, real estate, sales, e-commerce, інвестиції, маркетинг. Збираємо людей з реального бізнес контексту. Без наставників, астрологів, коучів і подібних форматів. Участь безкоштовна, кожен бере щось з собою по формату гриля. Локацію надішлю після підтвердження участі. Якщо хочете приєднатися - напишіть коротко про себе і компанію. Це допоможе зібрати сильне оточення. Далі надішлю всі деталі. ⸻ ENG We are gathering people from a business environment: founders, manufacturers, managers, C-level, specialists with project experience, operations, marketing, commercial roles. Format is simple: grill, introductions, live conversations about projects, experience, markets, board games, guitar, relaxed informal atmosphere without stage and without formal networking. Meeting on Saturday, May 2 at 14:00. Planned group size is 15-20 people. You can come with a friend. Already around 15 people confirmed. Areas include manufacturing, HR, real estate, sales, e-commerce, investments, marketing. We are bringing together people with real business background. No mentors, astrologers, coaches or similar formats. Participation is free. Everyone brings something in grill format. Location will be shared after confirmation. If you would like to join, please write a short intro about yourself and your company. This helps keep the group strong. I will then send full details

# Tired of dating apps or surface-level events? This is different. This is a **2-hour guided relational experience** designed to help you connect with other singles in your city — without small talk, pressure, or performance. **What happens:** • You join a 2-hour guided online session • You meet a small group of folks practicing Ethical Non-Monogamy in Berlin and open to new connections • You’re led through structured connection exercises • Within 48 hours, you meet the same group in person • You stay connected afterward via WhatsApp **This is for you if:** • You’re done with shallow or random social spaces • You want deeper, more intentional connection • You’re open to a structured experience If you’re just browsing or looking for something casual, this likely won’t be a fit. **Important:** Spots are limited and booking happens through our website. 👉 Reserve your spot & stay in the loop with new events every month: [[https://consciousconnections.com/join](https://consciousconnectionsclub.com/join)] **When:** Online session: [11 AM - 1 PM] In-person meetup: within 48 hours (details shared after booking) Most people come alone. Most leave having met people they genuinely want to see again.

**⭐ DOORS OPEN AT 19:30. PLEASE ARRIVE BEFORE 8PM! ⭐** The Creative Code Stammtisch is a casual show-and-tell for artists, makers, designers, coders, performers, learners and anyone interested in the use of computing skills for artistic expression. The event is free and open to all, regardless of age, origin, gender or experience. Beginners and first-timers should feel especially welcome! You don't have to be a coder yourself 😃 HOW TO FIND US? Find Prachtsaal Studio by crossing the courtyard next to Cafe Augusta on Jonasstr. 22, 12053 Berlin. WHAT SHOULD I EXPECT? We start with quick introductions, then open the floor to anyone who wants to present something. There are usually around six 10-minute slots available, plus time for questions from the audience. First-timers are encouraged to share their work. Topics range from net art to computational design and interactive installations all the way to wearable electronics or generative poetry. If you’re wondering whether your own project might fit, take a look at the [Stammtisch archive](https://creativecodeberlin.github.io/Stammtisch/) to see what others have shared in the past. This event is *not* just for coders! New-media artists and anyone working with technology in their art are very welcome to share. If you enjoy art and/or technology, you’ll likely have a great time, and maybe even learn something new! BEGINNERS WELCOME! If you’re new to creative coding, you can find beginner-friendly resources at [creativecode.berlin/learn](https://creativecode.berlin/learn). THIS IS YOUR SPACE We do our best to create a welcoming environment for all people regardless of race, ethnicity, color, religion, gender identity, sexual orientation, national origin, age, disability, or genetics. People from group generally underrepresented in open-source, art, and technology fields are warmly encouraged to come by. And if you know someone who might enjoy this meetup but isn’t sure it’s for them, let them know they’ll be welcome! SAFE SPACE POLICY We support the Berlin Code of Conduct: [berlincodeofconduct.org](http://berlincodeofconduct.org/) Please read and make sure you agree with its content. ACCESSIBILITY Prachtsaal Studio is located on an easy to access ground floor. We're very sorry to say that the bathrooms are not wheelchair accessible yet. DO I NEED TO SPEAK GERMAN? We speak mostly English so international guests are more than welcome! Our team also speaks French, Italian, Spanish, Dutch, Finnish and German... though language availability may vary depending on which organizers are present :) CONTACT Raphaël de Courville team@creativecode.berlin +49 (0) 176 70070572 or get in touch via [creativecode.berlin](https://creativecode.berlin/) *** The featured artwork of the month is by https://www.instagram.com/ii_v.i We'd love to feature your work on the cover for the next Stammtisch! Please send an image at team@creativecode.berlin

Most of us would know peruvian cuisine for its famous civeche, but there're actually lots more delicious seafood, meat and vegetable dishes to discover. This is a small delightful restaurant serving refined peruvain cuisine with an impressive wine list. Please do not sign up unless you are sure to attend. Late cancellations or no shows will be deleted from the group immediately.

**⚠️ IMPORTANT: REGISTRATION MANDATORY ⚠️** Registration on **Luma** is **REQUIRED** to attend this event. **Link: https://luma.com/1rmr2buu?utm_source=meetup** Your registration is subject to host approval. You must complete the registration process on lu.ma to receive the full event location details and confirmation of your attendance. **Please note: Without approved registration on Luma, you will NOT be able to access the event location or attend.** We are excited to host a **BLISS x JetBrains** workshop featuring **Ivan Dolgov**, who will guide us through an interactive session on the field of *LLMs for Code Generation*. ​ **Title:** *Master LLMs for Code Gen* 📅 **Date:** 30th April 🕕 **Time:** 18:00 📍 **Location:** TU Berlin, Marchstrasse 23 MAR 0.011 (ground floor to the left) ​The session will last around 2 hours, followed by a networking session with JetBrains and fellow AI enthusiasts (and free pizza!🍕). Bring your laptop! *** ​**🔍 In this workshop, we will cover:** * ​💡 **The Architecture of Code Models:** Understanding the "under the hood" mechanics of LLMs trained specifically on source code. * ​💡 **Prompt Engineering for Developers:** Mastering the art of context-injection to get high-quality, compilable code outputs. * ​💡 **Evaluating Code Quality:** Techniques for validating LLM-generated code and identifying potential security or logic pitfalls. * ​💡 **JetBrains AI Integration:** How professional IDEs integrate these models to enhance productivity without sacrificing developer control. *** ​**👥 Who should attend?** ​This workshop is specifically designed for *women and underrepresented gender minorities.* Because we will be diving into the technical nuances of code generation, we are looking for: * ​**Students** with foundational knowledge of **python** * ​Aspiring engineers and researchers eager to bridge the gap between ML theory and practical dev tools **⚡ FINAL REMINDER ⚡** **You MUST register and be approved on Luma to attend. The event location will only be visible after your registration is confirmed by the host. Link: https://luma.com/1rmr2buu?utm_source=meetup** *** We are **BLISS e.V.**, Berlin’s AI community connecting like-minded individuals passionate about machine learning and data science. Our **BLISS Workshops** connect **students and young professionals with industry partners**, offering an inside look into **how machine learning is applied in real-world settings** \- from research and development to deployment\. ​​​BLISS Website:[ https://bliss.berlin](https://bliss.berlin/?utm_source=luma) ​​​BLISS Youtube:[ https://www.youtube.com/@bliss.ev.berlin](https://www.youtube.com/@bliss.ev.berlin?utm_source=luma)

It feels like we just saw each other 🤷. Join members of the local design and UX community for our monthly breakfast. For May we’re stopping in for Rooh’s popup breakfast/cafe concept. You know someone is getting the lobster yuzu croissant, and that’s not even the prettiest thing on the menu!.

WQC has weekly Thursday night social nights at the Westerville Java Central. Come and grab a coffee and connect with the community: low stakes, chill environment, and tasty drinks. No registration is required; come as you are.

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

Connected Westerville Night of Networking flips the script on networking, with surprises and connections that'll make you say, "Who knew networking could be this much fun?!"

Practical AI for Power BI Developers A year ago, “agentic AI” was mostly hype for Power BI teams. Today, it deserves your undivided attention. For Power BI pros, there is now a real opportunity to reduce repetitive development work, accelerate delivery, and help developers do more, but only when strong DataOps practices are in place to make AI workflows effective. This session is a no-nonsense introduction to effective AI patterns for Power BI and Fabric development. Along the way, we will make sense of the growing pile of terminology, including skills, plugins, hooks, and MCP. You will see examples of how modern AI tooling can help with development tasks across Power BI and Fabric, along with the prerequisites, guardrails, and DataOps principles needed to use it responsibly. Whether you're burned out on AI hype or already using Copilot CLI daily, this session will show you the foundations that are finally making AI-assisted development genuinely useful.

Join the CONNECTED Westerville Mastermind Group for a dynamic afternoon of B2B networking! This event is perfect for professionals looking to expand their business connections, share insights, and foster collaboration within the community. Whether you are a seasoned entrepreneur or just starting out, this event offers a valuable opportunity to exchange ideas, build relationships, and grow your network in a supportive environment. Connect with like-minded individuals, explore potential partnerships, and discover new opportunities for professional growth. Don't miss out on this chance to enhance your business network and take your career to the next level with CONNECTED Westerville Mastermind Group! We meet the 4th Monday of every month from 11am-1pm. Welcome and general networking from 11am - 11:30am with core meeting 11;30 - 12:30 and a final round of networking from 12:30 - 1pm.

Join other experienced and aspiring agile coaches and professionals to: * develop and practice your coaching skills in a peer-to-peer environment * share current successes and challenges in your work environment and get support from each other * learn from each other, build better relationships and experiment with new ideas ***NOTE:*** Pre-registration is required for this event. **Please arrive 10 minutes early** to check in at the security desk.