Payment Systems

We will be hosting our May Meetup. Thanks to Amazon for sponsoring us. Please note that you have to show sign up with your real name and show a Photo ID to the building security before entering the building. Every visitor will have their photo taken that will be printed on their paper visitor badge. This is a requirement from the building security. If you are not ok with that, please do not sign up. You can not bring a +1, everyone needs to sign up. Please only sign up if you plan to come, we will keep notes. *Excited to announce our talks:* **pg_lake: Unifying transactional and analytical data with Postgres** by Celeste Horgan, Sr. OSS Developer Advocate at Snowflake. The common wisdom goes: data is either transactional or analytical, and workloads are OLTP and OLAP-shaped to match. The reality of generating and using data is different, and often we need a bit of both. The pg_lake extension brings OLAP workloads to OLTP Postgres. This talk will explore the pg_lake extension, including how to build it, and demos of using it with modern data workloads in object storage like Amazon S3. We’ll create simple data pipelines with no ETL and high performance analytics. **I Didn't Know Postgres Could Do That!** by Robert Treat, Principal Database Engineer at AWS and PostgreSQL Major Contributor. PostgreSQL is often thought of as "The Database for DBAs", but what more and more developers are finding out is that what makes Postgres "The Worlds Most Advanced Open Source Database" is its wide array of features, many of which are really geared towards engineers building applications on top of Postgres. In this talk, we'll look at some of the features in Postgres you may not have seen in other database systems, and talk about how you can make use of those features in your applications. Queries, indexing, data types, and more will all be up for discussion as we show you examples of just what Postgres can do.

Amazon Aurora DSQL is a groundbreaking technology that has a potential to re-define the entire DBMS solutions. Yet there are lots to uncover, lots to learn on the resource! Therefore, we are inviting you experts on Aurora DSQL with an engaging hands-on workshop to experiment uses of Aurora DSQL, and also learn on the topic. **Build a Multi-Region, Active-active Rewards App with Aurora DSQL** In this workshop, get hands-on experience with Amazon Aurora DSQL, a serverless distributed SQL database that delivers active-active high availability. Learn how to build a retail rewards points application with active-active resiliency across multiple Availability Zones and two Regions. Explore how ACID transactions and active-active replication work in Aurora DSQL. Discover best practices for data model and application design and more. You must bring a laptop to participate. This is a hands-on workshop with a practical deep dive into Amazon Aurora DSQL. You work through independent tasks that you need to complete, with support of AWS Facilitators. The event will also begin with an expert talk: "The Evolution of Resilience - Lessons Learned from 25 Years of Infrastructure Architecture" - further details ahead! **When?** 7th of May\, Thursday\,\| 12:30 \- 18:00 **Where?** AWS Office - BER 21 - Tamara-Danz-Str. 13, 10243 Berlin. **How?** [Fill out this form ](https://forms.gle/CMoz6qGraX8HBHVU6)to apply. Limited seats are available. You can only participate in the workshop if you receive a confirmation mail from us (**kadir@berlinawsug.de**). You need to bring your own laptop to this workshop. ❗**Registration - Read Carefully**❗ Participation is free of charge. Your workshop resource usage is also covered. You will be provided a sandbox AWS account. Therefore, you won't need an AWS account! ❗Please register with your full name by filling out this form: [Registration Form](https://forms.gle/CMoz6qGraX8HBHVU6) ❗You need to bring your own laptop to this workshop. Make sure AWS CLI is installed. Contact us if you're not sure how. ❗A confirmation e-mail from Meetup is not relevant. **You can participate only if you receive a confirmation from us: kadir@berlinawsug.de** \-\-\- **Additional Information** **This event is wheelchair friendly.** Help us spread the word, and invite your friends & colleagues! If you're attending with wheelchair and need assistance, please mail us: organisers@berlinawsug.de for further details. Would you like to host AWS UG Event at your company? [Register here](https://bit.ly/aws-host) Would you like to speak at AWS UG MeetUp? [Submit your topic here](https://bit.ly/aws-talk)

Welcome to the Berliner Bitcoin-Stammtisch, where we gather to talk about the digital currency that's worth more than gold and sometimes causes more drama than a Netflix series. Join our tribe of business beings, developers, and activists who believe that Bitcoin is the future of money, and El Salvador seems to agree! Here you can learn the ropes of Bitcoin, from buying your first fraction to safely storing your private keys. Our current hangout spot is Friedel Richter on Torstraße, because ROOM77 is closed until the last block is mined. You can pay in Bitcoin ₿ or Lightning ⚡ and enjoy awesome regional food with an international twist. So come join the fun, the food, and the revolution! We're waiting for you. 🍔🍔🍔

Hallo liebe Java User Group Mitglieder! Diesmal haben wir Peter Kranz mit seinem interaktiven Talk zu den unterschiedlichen Java-Versionen zu Gast. Wir freuen uns euch zu sehen (virtuell oder vor Ort). * 18:00 Uhr: Einlass * 18:30 Uhr: Talk * ab 19:30: Ausklang des Abends Dank an [adesso](https://www.adesso.de/de/unternehmen/standorte/nuernberg.jsp) für Location, Bier und Pizza! \-\-\- Java entwickelt sich seit Version 9 im Halbjahresrhythmus weiter – mit Records, Pattern Matching, Virtual Threads und vielen weiteren Features. Doch wer hat schon die Zeit, 17 Releases im Detail zu verfolgen? Die Fülle an Neuerungen ist enorm, und je nach Projekt und Interesse sind ganz unterschiedliche Features relevant. Ein klassischer Vortrag kann hier nur einen starren Pfad durch die Feature-Landschaft bieten. Dieser Talk geht einen anderen Weg: als interaktiver Dungeon Crawler. Das Publikum entscheidet gemeinsam, welchen Themenkomplex es als Nächstes erkunden will – Moderne Sprach-Features, Concurrency, APIs, JVM-Tooling oder experimentelle Preview-Features. Jede Entscheidung führt tiefer in den Dungeon und schaltet neue Level frei. So entsteht bei jedem Vortrag ein einzigartiger Pfad durch die Java-Versionen 9 bis 26. Wie in einem echten Dungeon Crawler sammelt das Publikum dabei XP und wird am Ende einer Klasse zugeordnet – vom Warrior mit Fokus auf Performance bis zum Wizard der Sprach-Features. Ob Einsteiger:in oder erfahrene:r Entwickler:in: Jede Session liefert praxisnahe Einblicke in genau die Java-Features, die das Publikum am meisten interessieren. Kein Vortrag gleicht dem anderen – und der einzige Weg, alles zu sehen, ist wiederzukommen. \-\-\- Dein Vortrag bei der Java Usergroup Nürnberg! Hast du dich in letzter Zeit in deinem Projekt oder privat mit einem interessanten Thema beschäftigt? Vermutlich ist das nicht nur für dich selbst interessant! Hast du Lust, selber einmal einen Vortrag bei der Java-Usergroup Nürnberg zu halten? Wir sind nicht nur auf Java-Themen fokussiert, sondern beschäftigen uns gern mit und um alles über Software Entwicklung und IT. Wir wollen bei der JUG nicht nur bekannten Speaker\*innen eine Plattform geben und die neuesten State-of-the-Art Technologien vorstellen. Wir freuen uns auch besonders, wenn wir Themen aus unserem technologischen (Arbeits-)alltag Raum geben zu können. Melde dich gerne bei uns, wenn du dazu Lust hast, wir geben wenn gewünscht gerne auch Hilfestellung bei der Vorbereitung!

This meetup hosted by **Venture Cafe Berlin** focuses on **Food Security**— exploring how innovation in foodtech can help Europe to build geopolitical resilience. This event gives the foodtech and startup ecosystem a much-needed macro lens, reframing innovation not just as a market opportunity but as a strategic lever for Europe’s resilience, sovereignty, and long-term geopolitical stability. This event is prepared in cooperation with Food Hack. Join **founders, investors, ecosystem builders, and curious minds** for open conversations, practical insights, and meaningful connections. **What to expect:** * **Info & Demo Tables (5:00–8:00 PM):** Discover startups, technologies, and ecosystem initiatives. * **Mentor Hours:** Guidance on public affairs, regulation, and government relations for startups. * **Workshops & Talks:** * *Outliving Your Diet: How Metabolic Flexibility and Protein Intake Drive Human Healthspan* * *Can innovation in foodtech help Europe to build geopolitical resilience?* * **Networking & Beats:** Meet fellow innovators, exchange ideas, and connect in a relaxed atmosphere. Come learn, share, and connect with the **Berlin tech community**. More info and speakers here: https://community.venturecafeberlin.org/events/55 *Note: To avoid queue at the door you can pre-register for check-in on the above link.* \-\-\-\-\-\-\- For the latest Berlin Tech News, Events & Jobs head to **[techinberlin.com](https://www.techinberlin.com/)**

Here we go again! The OWASP Berlin organizing team is happy to welcome you to the Wolt office at Stralauer Allee this time. Join us for an evening of knowledge sharing, networking, and discussions on all things IT Security. Whether you’re a seasoned security professional or just starting out in the field, this is a great opportunity to connect with the community and learn from experts. **The Talks** * *When Git History Lies: Commit-Date Spoofing as Malware Cover*, Sarthak Taneja * *From Prompts to Production: Finding Business Logic Failures in AI-Generated Applications at Scale*, Nohé Hinniger-Foray, Escape * *Having fun with Domains: ccTLDs, gTLDs, sTLDs, eTLDs ...*, Tim Philipp Schäfers, Mint Secure

Join Aiven and Google Cloud for a hands-on lab to learn building data infrastructure for AI applications in production, and how to run OpenSearch in production for AI and GenAI workloads. ***IMPORTANT: Please register on* \*\*\*[HERE](https://bit.ly/4sLWiua) \*\*\**to secure your sport.*** This interactive, instructor-led workshop is designed for developers and data engineers who want to build and run real-world data pipelines using open source tools. Note: Bring your laptop, we’ll be shipping code together. Agenda: \* 5:00pm\~5:30pm: Check-in, Food, Networking \* 5:30pm\~7:30pm: Tech talks and Hands-on Workshop \* 7:30pm\~8:00pm: Q&A, wrap-up ⚡️ Workshop 1 — Foundations: Build Your Own Pipeline ​Start from scratch and assemble a complete data pipeline using Aiven services. \- Provision and manage services -Connect systems into a unified pipeline ​- Build an observability setup \- ​Query real\-time data across services using SQL ​​ ⚡️ Workshop 2 — Advanced: Real-Time Retail Streaming Pipeline ​Go deeper with a real, production-inspired use case. \- ​Design and implement a high\-quality streaming pipeline \- Work with real\-time retail data flows \- Apply best practices for scalability and reliability What you’ll learn: * Deploy and scale OpenSearch for production * Best practices for vector and hybrid search * Build efficient real-time data pipelines * Design and optimize RAG architectures ​Why attend? * Build a production-style data pipeline * Learn how to connect Kafka, ClickHouse, OpenSearch, and PostgreSQL into a working, real-time architecture. * Learn by doing and Apply proven patterns * Provision services, stream data, and run queries yourself using both UI and CLI workflows. * Walk away with practical approaches you can reuse for streaming, analytics, and observability use cases. Who Should Attend: Developer and data engineer, interested in moving from prototype to production with OpenSearch. ​ **RSVP is not enough. You must apply for a ticket here:** [https://bit.ly/4sLWiua](https://bit.ly/4sLWiua)

### **It is never too late to discover Your voice.** ‍ This workshop series is created for those who are just beginning their journey as performers, as well as for those who are looking for fresh inspiration and a deeper connection to their artistic expression. The programme consists of **five interactive workshops** designed to explore the many dimensions of voice and stage presence. Each session combines **playful exercises, vocal training, creative exploration, and stage time**. After introducing the theme of the day, we immediately bring it into practice by performing in front of one another in a supportive and encouraging environment. ##### **PROGRAMME:** **04 April** — *Basics of Singing* Primal Sounds & Vocal Registers **11 April** — *Vocal Fundamentals* Colors, Effects & Techniques **18 April** — *Inspiration & Inner Voice* Creative Flow & Spiritual Guidance **25 April** — *Stage Movement & Stage Presence* **02 May** — *Overcoming Stage Fright* ##### **TICKETS:** **Per Workshop:** regular: 25€ for DNA. Members: 20€ **Full package (discounted):** **‍**regular: 125 > 115€ for DNA. Members: 100 > 89€

Life gets heavy sometimes — and we believe no one should carry that weight alone. This discussion circle is a supportive space where we gather to speak openly about our struggles, mental health journeys, and personal challenges — without fear of judgment. Whether you’re facing anxiety, burnout, grief, or just feeling lost, this is a time for real talk, real people, and real healing. 
We’re not therapists or professionals — we’re humans navigating life, just like you. What we offer is empathy and understanding. 
What to expect:
• Respectful conversations
• Listening without pressure to fix
• Optional prompts to get things flowing
• A calm, welcoming environment 
Come as you are. You don’t need to have it all figured out. 
The event takes place every 2nd and 4th Sunday of the month and is donation based. If possible, please consider helping us cover the location and Meetup expenses with a small contribution. :) Paypal (Friends&Family): mhps.berlin@gmail.com

Liebe Bitcoinerinnen, wir laden euch herzlich zu unserem nächsten Les Femmes Orange Meetup ein — ein Raum von Frauen, für Frauen, die sich für Bitcoin begeistern oder einfach neugierig auf das Thema sind. Egal, ob du schon lange im Bitcoin Space bist oder gerade erst eintauchst – komm vorbei, tausche dich aus, vernetze dich mit anderen Frauen und lass dich inspirieren. Dieses Mal treffen wir uns im **Restaurant Huong Que**. Im schönen Bergmannkiez. Je nach Wetter sitzen wir draußen oder drinnen. Für Fragen, Feedback und Infos: Les Femmes Orange Berlin **Telegram-Gruppe** https://t.me/+ccJ7AYxrz4FjOTdi Wir freuen uns auf euch!

**IMPORTANT! Please register at** [Luma Page](https://luma.com/9svvrv99) ​Vibecoding is no longer the question. What matters is what you actually do with it. **​On May 9** at **Spiced Academy (Berlin)**, we meet to figure that out in practice — using **[Lovable](https://lovable.dev/)**. No lectures, no slides. You open the tool and start working. ​[Projector Global community](https://www.linkedin.com/company/projector-global-community/) ambassadors and mentors will guide you through the basics, help you navigate the process, and answer your specific questions. **​This event is for those who:** — already have some experience in vibecoding — want to test a tool hands-on instead of watching demos — are stuck on something specific and want a real answer ​Come with a question. Even better — submit it during registration. ​We recommend creating an account in advance so you can jump straight in. **Mentors** During the session, you’ll be supported by experienced builders and designers: * **[Vitalik Kotik](https://www.linkedin.com/in/vitali-kotick/)** — CEO & Co-Founder @Superapp, ex-Bolt Senior Product Designer * **[Yevheniia Liubchyk](https://www.linkedin.com/in/yevheniia-liubchyk/)** — Product Designer @Zoi * **[Olha Kirdiaieva](https://www.linkedin.com/in/olha-kirdiaieva/)** — UX Designer @JUPUS * **[Danilo De la Fuente](https://www.linkedin.com/in/danilo-de-la-fuente-product-manager/)** — Founder @Arma Music, Product Manager They’ll be there to help you unblock, give direction, and support your ideas in real time. **​Tool Partner — Lovable​** This event is supported by [Lovable](https://lovable.dev/) \- an AI\-powered tool for building products faster\, without getting stuck in complexity\. ​Lovable helps you turn ideas into working solutions, experiment quickly, and focus on what matters - logic, flow, and outcomes. ​Participants will receive free credits to explore the tool during the session. Learn more: [https://lovable.dev/](https://lovable.dev/?utm_source=luma) **​Venue Host​​​** Hosted by [Spiced Academy](https://www.spiced-academy.com/en) — a Berlin tech education hub focused on hands-on learning in AI, Data, UX/UI, and Product, and building a strong tech community. **Hosts**​​​ This event is organized by [Projector Global Community](https://www.linkedin.com/company/projector-global-community/) ambassadors (by [Projector Institute](https://prjctr.com/en/about)): * ​​​[Emiliia Karpiuk](https://www.linkedin.com/in/emiliiakarpiuk/?utm_source=luma) * ​​[Julia Savchuk](https://www.linkedin.com/in/yuliia-savchuk/?utm_source=luma) **​​​​Photos & Video** ​​​​Please note that we will be taking photos at this event. By attending, you agree to be photographed, and grant the organisers permission to use this footage online and for marketing purposes (e.g., on social media or our websites).

Important: Register on the [AICamp event website](https://www.aicamp.ai/event/eventdetails/W2026050708) is required for admission. Join Aiven and Google Cloud for a hands-on lab to learn building data infrastructure for AI applications in production, and how to run OpenSearch in production for AI and GenAI workloads. This interactive, instructor-led workshop is designed for developers and data engineers who want to build and run real-world data pipelines using open source tools. **Note:** Bring your laptop, we’ll be shipping code together. **Agenda:** \* 5:00pm\~5:30pm: Check-in, Food, Networking \* 5:30pm\~7:30pm: Tech talks and Hands-on Workshop \* 7:30pm\~8:00pm: Q&A, wrap-up ​ **⚡️ Workshop 1 — Foundations: Build Your Own Pipeline** ​Start from scratch and assemble a complete data pipeline using Aiven services. \- Provision and manage services -Connect systems into a unified pipeline ​- Build an observability setup \- ​Query real\-time data across services using SQL ​​ **⚡️ Workshop 2 — Advanced: Real-Time Retail Streaming Pipeline** ​Go deeper with a real, production-inspired use case. \- ​Design and implement a high\-quality streaming pipeline \- Work with real\-time retail data flows \- Apply best practices for scalability and reliability **What you’ll learn:** * Deploy and scale OpenSearch for production * Best practices for vector and hybrid search * Build efficient real-time data pipelines * Design and optimize RAG architectures **​Why attend?** * Build a production-style data pipeline * Learn how to connect Kafka, ClickHouse, OpenSearch, and PostgreSQL into a working, real-time architecture. * Learn by doing and Apply proven patterns * Provision services, stream data, and run queries yourself using both UI and CLI workflows. * Walk away with practical approaches you can reuse for streaming, analytics, and observability use cases. **Who Should Attend:** Developer and data engineer, interested in moving from prototype to production with OpenSearch.

Welcome to Sunday Tech Coffee. This is a **networking** event for those in the tech industry in Berlin. We are usually inside and to the right. Ask the barista/bartender if you can't find us.

Customer identity resolution becomes increasingly complex as organizations scale across multiple systems, regions, and data formats. Traditional rule-based approaches often fail to keep up with data variability, require constant manual tuning, and struggle with real-time processing needs. This session presents a practical approach to building a scalable identity resolution pipeline using AWS services and modern AI techniques. The architecture combines data ingestion through Amazon S3 and AWS Glue, transformation pipelines using Spark on EMR, and machine learning models deployed via SageMaker for entity matching and standardization. Graph-based relationship modeling is implemented using Amazon Neptune to improve resolution accuracy by incorporating household and shared attribute context. We will walk through how machine learning models can be used for name and address normalization, how intelligent blocking strategies improve matching efficiency, and how feedback loops can be introduced to continuously improve accuracy. The session also highlights how serverless components such as AWS Lambda can be used for orchestration and real-time processing. **SPEAKER BIO** Mosaic Syed is a Senior Data Engineering and Cloud Solutions Architect with over 20 years of experience designing and delivering scalable, secure, and high-performance data solutions across global enterprise environments. https://www.linkedin.com/in/mosaic-basha-syed-92300856 **CALL FOR SPEAKERS** Learn more: [https://www.awscolumbus.com/get-involved/](https://www.awscolumbus.com/get-involved/) **THANK YOU** *VEEAM* for hosting our meetup! To learn more about *Veeam*, please visit their website: [https://www.veeam.com/](https://www.veeam.com/) **DIRECTIONS** 8800 Lyra Dr #450 · Columbus, OH go to 4th floor. **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

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.

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.

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?!"

**Total Eclipse of the Chart: School Redistricting Dashboards** In this presentation, we will explore the utilization of maps, sets, and SQL within a Tableau dashboard to help provide “what-if” analyses generated through the use of a mapped dashboard, providing different scenarios and the potential implications of these. While in this use case we are focused on a large school district, the concepts of utilizing existing data to explore the future impacts of modifying different geographic boundaries can be useful to many industries, balancing the mix of maps with visual analytics. **About Our Speaker** Robert Kramer is the Data Systems and State Reporting Coordinator at South Western City Schools in Grove City. He has worked there for 17 years, serving previously in the roles of Data Analyst, Programmer, and Operations Coordinator. Prior to working at South Western, he worked as a Systems Engineer at Pinnacle Data Systems in Groveport. He graduated in 2005 from The University of Toledo with his Bachelor’s in Computer Science and Engineering, and a minor in Mathematics. Robert resides in Obetz with his wife, and their 15 and 12 year-old daughters. He was also just elected to his 3rd four-year term on the Obetz City Council. 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)