Payment Systems

While we are approaching the middle of the year and KotlinConf is just over - we are thrilled that Trade Republic hosts us again! So mark the date! **Line-Up:** 👉 **Lists, Sequences, and Flows: Scaling Data Processing in Kotlin without Melting Your Memory.** *by Daniela Valero* In this talk, Daniela shares her journey of meeting a major backend deadline while managing a data pipeline's memory footprint. You’ll learn how to transition from eager List operations to lazy Kotlin Sequences and jOOQ Streams (using database fetchSize chunking) to keep memory usage flat. Finally, we’ll explore using Kotlin Coroutines and Flow to introduce safe concurrency so your data processes quickly without straining your database. 👉 **The show must go on** Kotlin-based Kafka dead-lettering solution without external (system) dependencies *by Blagoja "Baki" Stamatovski* **👉 Job Market Insights from a Kotlin developer** *by* Ivan Gafurov **Speaker Bios:** 🗣 **TDB**

**PLEASE REGISTER YOUR ATTENDANCE ON [LUMA](https://luma.com/72kv5zxm)​** Join IBM x KI Park for an afternoon exploring **how AI-driven automation enables scalable, resilient enterprise operations across the stack.** ​Hear real use cases from leading organisations, exchange peer insights and connect with practitioners and solution builders. **Why join:** * ​Gain a better understanding of how AI-driven automation is reshaping business operations, security and enterprise resilience * ​See how leading organizations move from AI adoption toward autonomous workflows across the enterprise stack * ​Learn how to scale intelligent automation in complex, growing tech ecosystems * ​Discuss how operating models and collaboration evolve around automation * ​Share challenges, compare approaches and gain practical lessons from peers ​**Agenda** * ​14:00 – 15:00 **Registration & Coffee** * ​15:00 – 15:45 **Opening keynotes** * ​Dr. Florian Schutz, Managing Director, KI Park * ​**The Enterprise Complexity Ceiling: Why the Tech Stack Isn’t Getting Smaller, A discussion of AI-infused Automation to the architecture of organizations** by Sebastian Grodzietzki, Principal DACH Automation Developer Ecosystems Leader & DACH Quantum Ambassador Leader, IBM * ​15:45 – 17:30 **Case perspectives & peer insights** * ​"**Building Autonomous Networks: From AI Potential to Value**" by [Karim Kotobi,](https://www.linkedin.com/in/karimkotobi/) Vodafone, Global Digital Product and Transformation Leader * ​"**Why MCP is Only the Plumbing: Building the Contextual Foundation for AI Agents**" by [Bastian Maiworm](https://www.linkedin.com/in/bastianmaiworm/?locale=de), Amber Tech, Co-founder * ​"**Rethinking SaaS Engineering: How Small Teams Run and Evolve Enterprise-scale Systems in the AI era**" [Matthias Heicke](https://www.linkedin.com/in/matthiasheicke/), CTO / Co-Founder, Sweap.io * ​17:30 – 18:10 Fishbowl Discussion – Audience participation/Interactive * ​18:10 – 19:30 Networking & Drinks ​**Who should attend** * ​Tech decision-makers across the enterprise stack * ​Platform, product and engineering leaders Limited seats. Free event · An RSVP on Meetup does not guarantee participation. To attend, registratation via [LUMA](https://luma.com/72kv5zxm) is required. Only confirmed participants will be admitted and will receive a confirmation email. We look forward to welcoming you to the event! \*\*\*\*\* *​By registering for this event, you agree that your registration data will be shared with KI Park and IBM for the purpose of event organisation, communication related to the event and relevant follow-up. Each organisation will process your data in accordance with their respective privacy policies. KI Park ([https://kipark.de/datenschutzhinweise/](https://kipark.de/datenschutzhinweise/?utm_source=luma)), IBM ([https://www.ibm.com/de-de/privacy](https://www.ibm.com/de-de/privacy?utm_source=luma)).*

Join us for the **Data Berlin Meetup**, an evening of talks, insights, and networking for the data community in Berlin. RSVP on Luma at https://luma.com/s9868ww4. **Agenda** **6:30 PM – 7:00 PM** — Registration and Networking **7:00 PM – 7:10 PM** — Welcome and Opening Remarks — Data Berlin Meetup Team **7:10 PM – 7:35 PM — Rewiring the Engine: Taming Billions of Audience Data at Scale** **Speaker:** [Adedeji Rodemade](https://www.linkedin.com/in/adedeji-rodemade/), Team Lead Data Analytics Engineering **7:35 PM – 7:40 PM — Short Break** **7:40 PM – 8:05 PM — Creating a Parallel Universe: How We Evaluate The Impact of Ad Campaigns in the Physical World** **Speaker:** [Majid Mostafavi](https://www.linkedin.com/in/majid-mostafavi/), Team Lead Data Science **8:05 PM – 8:30 PM — From Snaps to Footsteps: Experiments for Measuring Offline Impact** **Speaker:** [Mihaela Tsankova](https://www.linkedin.com/in/mihaela-tsankova-48560453/), Group Manager, Marketing Science at Snap **8:30 PM – 9:30 PM — Closing Remarks and Extended Networking** **About our host** **[Adsquare](https://www.adsquare.com/?utm_source=luma)** helps brands connect people and places in a **privacy-first** world with **location intelligence** — data and tools for planning, activation, measurement, and attribution across digital marketing and drive-to-store campaigns. **Looking for a job?** Browse data & AI roles in Berlin (updated daily): [databerlin.net/jobs](https://databerlin.net/jobs) **Want updates or more info?** Subscribe to our newsletter: [databerlin.substack.com](https://databerlin.substack.com). Follow us on [LinkedIn](https://www.linkedin.com/company/data-berlin?utm_source=luma). Join our [Slack community](https://join.slack.com/t/data-brln/shared_invite/zt-2ued0xvdu-aihzi2cKEwD_6_KDRd_1ag?utm_source=luma).

**Join us for an inspiring Women’s Empowerment Meetup! 🌟** Connect with like-minded women, share your stories, and empower each other in a supportive and inclusive environment. This event is designed to foster connections, build confidence, and provide valuable insights for personal and professional growth. **✨ What to Expect:** * **Engaging Discussions:** Participate in thought-provoking conversations on topics that matter to you. * **Networking Opportunities:** Meet and connect with women from diverse backgrounds. * **Empowerment Exercises:** Take part in activities designed to boost your confidence and self-awareness. **🌐 Prepare for the Meetup:** Before attending, we encourage you to complete the **[Energy Snapshot](https://wearephilia.com/)**[ ](https://wearephilia.com/)**[Exercise](https://wearephilia.com/)**. This exercise will help you gain deeper insights into your energy levels and prepare you for a more enriching experience at the event. **📲 Learn More & Join Us Elsewhere:** To learn more about who we are, discover other upcoming events, and find out how you can get involved with our community, visit this page: **[Philia Meetups Overview](https://wearephilia.notion.site/Welcome-to-Philia-cfdfbff0725b421a9555bb2ae6f9dd20)** Don’t miss this opportunity to empower yourself and others in a dynamic and supportive setting. We look forward to seeing you there! **Register now and be part of something amazing!**

Join us for a casual Product Round in Neukölln — a relaxed evening for product people who enjoy meaningful conversations and a user-first mindset. 🗓 When? Every last Thursday of the month (Join the Discord channel to get 🔔 reminders and 📍 location updates: [https://discord.gg/6cKgFKXY4f](https://discord.gg/6cKgFKXY4f) Currently moving there to keep the community and events free and accessible for everyone.) 👋 Who it’s for • Designers (UX / UI) • PMs & POs • Developers & Engineers • Researchers • Aspiring product people 💬 What to expect • Casual conversations about real product work • Sharing experiences, challenges, and learnings • Getting to know other product people in Berlin • No talks, no presentations, no pressure • Just drinks, chats, and good company 🚫 Please note This is a no-sales, no-pitch, no-dating space. The goal is simple: connect, exchange, and enjoy the conversation. If you care about building products with users in mind and want to meet like-minded people — this is for you. See you there! 😊 Phil

**The TypeScript Berlin meetup is back!** After a long break, we're reviving the meetups for 2026 and we'd love to see you there. Whether you've joined us before or you're coming for the first time, welcome! Come round for talks, snacks, good conversations, and a chance to connect with other TypeScript devs in Berlin. *** **🎙️ Interested in speaking?** We have an ongoing call for speakers for this event as well as future ones. [Fill it out here](https://tally.so/r/jaGa1J). *** **📅 Schedule** * 18:30 - Doors open, drinks and snacks 🍕 * 19:00 – Welcome 🤝 * 19:05 - Talk 1: "**Type-Driven Architecture: Stop Validating, Start Designing**" by [Mahesh Haldar](http://in.linkedin.com/in/haldarmahesh) 🎙 * 19:35 - Talk 2: "**Soundness holes in TypeScript’s type system**" by [Alexey Orlenko](https://www.linkedin.com/in/oleksiiorlenko/) 🎙 * 19:50 - Break 🥤 * 20:05 - Talk 3: "**Prisma Next: AI-Native, Graph Migrations, Extensions & Middleware**" by [Will Madden](https://www.linkedin.com/in/willmadden/) 🎙 * 20:35 - Talk 4: "**Prisma Next Performance**" by [Serhii Tatarintsev](https://www.linkedin.com/in/sevinf/) 🎙 * 20:50 - Wrap-up * 21:00 - Doors close 👋 *** This meetup is organised by [Prisma](https://www.prisma.io/). By attending the event, you agree to abide by our [Code of Conduct](https://www.prisma.io/event-code-of-conduct). For questions, reach out to events@prisma.io

**Exciting news: The second LeadDev Berlin meetup 2026 is here** Get ready for the upcoming LeadDev Berlin Meetup! Join us for our next LeadDev meetup on May 28th, and enjoy an evening of networking and lightning talks. Drinks and nibbles will be provided on the night, thanks to Zalando. **Date: Thursday, May 28th, 2026** **Time: 6 - 9 pm** **Location: Zalando BHW, Hedwig-Wachenheim-Straße 7, 10243 Berlin** **Spaces are limited - you must RSVP to attend.** **Note: Please bring a Photo ID with you. It will be required to enter the venue.** **Schedule:** **06.00 pm** \- Arrival\, networking and refreshments **06.30 pm** \- Welcome from host \- Zalando **06.40 pm** - [CJ Jenkins](https://www.linkedin.com/in/christina-jenkins/) \- Using AI Embeddings To Generate More Performant Features **07.00 pm** - [Ruben Nagoga](https://www.linkedin.com/in/ruben-nagoga-89666717/) \- How Ways Of Working Are Evolving **07.20 pm** \- Break **07.45 pm** - [Karima Mzoughi](https://www.linkedin.com/in/karima-mzoughi-0992b598/) \- Beyond Delivery: How Engineering Leaders Drive Real Business Impact **08.00 pm** \- Closing remarks **08.05 pm** \- Networking **09.00 pm** \- Close You can also [join our Slack workspace](https://click.pstmrk.it/3s/leaddev.com%2Fjoin-slack/d6eN/Oee1AQ/AQ/a9b371b4-7191-44ca-9609-20d7a87b5535/2/mdj-K8GnZN) to keep up to date with everything in our Berlin community. **Join the channel #leaddev-berlin or #berlin.** If you need further information or have any questions, please email [hello@leaddev.com.](http://hello@leaddev.com./) Here is a friendly reminder of our [Code of Conduct](https://click.pstmrk.it/3s/leaddev.com%2Fcode-conduct/d6eN/Oee1AQ/AQ/a9b371b4-7191-44ca-9609-20d7a87b5535/3/U3Fu0fY6qI) to help protect the safety of our community. Don't forget to share this with your colleagues who may be interested, and keep an eye out for upcoming meetups later this year. **Thank you to our Berlin meetup partner Zalando.**

Social picnic for singles (35+) who want kids and a family someday. Future Parents Social is designed for single adults (35+) who are open to having a child in the future, whether through intentional co-parenting, a meaningful connection, a long-term relationship, or modern family building. This social picnic welcomes open-minded people interested in genuine human connection in a relaxed and intentional atmosphere. The meeting is focused on thoughtful conversations with others who share similar values and future intentions. Monbijoupark, Berlin 6:00 PM – 8:00 PM Limited to a maximum of 16 participants (up to 8 women and 8 men) Advance payment required. More information and tickets via Eventbrite: [https://www.eventbrite.de/e/future-parents-social-tickets-1990288767280](https://www.eventbrite.de/e/future-parents-social-tickets-1990288767280) Due to the limited number of spots, reservations are confirmed only after payment. Please bring your own snacks and drinks. Languages: English, German, Spanish

**Move Capital. Move Talent. Move Africa.** Africa is the youngest continent on earth. By 2050, 1 in 5 people globally will be African. Yet African startups still receive less than 1% of global VC funding. What is the real problem? Is it time to tap into the estimated $95–100 billion USD in remittances sent by the diaspora? This Africa Day, in partnership with the Westerwelle Foundation, which has just published The German–Africa Investment Report, we will go deep into the gaps to explore : 📈 How Africa’s startup ecosystem is growing 🌍 Which New markets are rising, and how to pay attention to them 💡 Which segments pose the greatest returns outside of FinTech 🤝 How to take the best next step as an investor, proven by research. The event welcomes: Founders, Investors, Operators, the diaspora, and Institutional partners looking to make their moves into the African Market with intention. To our network members and partners who have been looking to make the move from remittances → to investment, from fragmented effort → to ecosystem building. This event is for you. Culminating from this event will be our delegation trip to #Nigeria and #Ghana in September in Collaboration with GITEX Nigeria and South Africa, and Namibia in November. Move Africa. #AfricaDay #AfricaRising #AfricanDiaspora #InvestInAfrica #AfricanInnovation #investment #funding # VC #Angelinvesting #African Excellence #Excellence #Leadership #FutureOfAfricaEvening Programme **SCHEDULE** 18:30 Arrival Networking reception Guests arrive. No job titles on badges — just names and country of origin. The room begins to know itself before the panel starts. 19:00 Opening Welcome & the diagnosis — 10 mins The host frames the evening in plain language. Not a speech — a provocation. Four sentences stating the diagnosis. Then the panel takes the stage. 19:10 Panel · 50 mins The conversation — moderated, flowing, unscripted Four panellists. One moderator. The conversation moves through the diagnosis naturally — from the wealth gap, to the talent drain, to the trust deficit, to the intention trap. No fixed questions. The moderator's job is to keep the room honest and the conversation moving toward one inevitable question: so what do we do about it tonight? 20:00 Panel · Open floor The room joins the conversation — 20 mins Not a Q&A. The moderator selects three or four people in the room — pre-identified — to add their perspective. Brief, pointed contributions that deepen the diagnosis rather than repeat it. The panel responds. The room feels heard. 20:20 Break Drinks — 20 mins The panel comes off stage and into the room. Guests speak directly with panellists. The conversation continues informally — which means it deepens.

This week we are discussing **Tove Ditlevsen:** Childhood. 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.**

**Rust Berlin Talks** is back for another evening of talks, shared ideas, and networking. Join us to learn, share, ask, and connect. If you work with Rust professionally, use it in side projects, contribute to open source, or are simply curious to learn more, you are very welcome. **Agenda** * Doors open: 18:30 * Start: 19:00 * Talks * Open mic / lightning talks * Networking **Speakers** Egor Lebedev - Welcome and a short note from the RustRover team Wolf Vollprecht - Pixi - A cross-platform package manager written in Rust Florian Gilcher - LLM Policies **Speaker Bios** Wolf Vollprecht is the founder and CEO of prefix.dev, where he builds open-source software supply chain infrastructure for the conda ecosystems. Core projects include Pixi (a cross-platform package manager written in Rust), rattler (crates to work with Conda packages), and rattler-build. With \~7 years in the conda ecosystem, including creating Mamba during his time at QuantStack, Wolf has a lot of experience in making package management fast, reproducible, and secure. Florian Gilcher used to be part of the Rust team in several positions and served as a member of the Rust Foundation board. He is also a co-founder of the Rust Berlin meetup. Today, he’s training Rust at Ferrous Systems, a company he co-founded. **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!

Looking to unwind, meet fellow founders, and connect with others in the startup world? Join us for a casual evening of good food, great company, and a friendly **poker tournament** with a €5 entry and €10 re-buy, 5/10 cent blinds that increase by 10 cents every hour. **What to Expect** **7:00 – 7:30 PM:** Check in & Mingle **From 7:30 PM:** Poker game begins (friendly competition, beginners welcome!) 🎟️ **€10 including Entry & Snacks + €10 Poker Chips to Play with, rebuy up €50.** **Everyone is welcome! Whether you’re a pro, a beginner, or just here to learn, we’ll divide tables based on experience. Please indicate your level with your name tag:** **🟢 Green – No clue, here to learn** **🟠 Orange – Beginner / Intermediate** **🔴 Red – Advanced / Professional** **✅ Spaces are limited, so claim your spot through this [SIGN UP FORM](https://forms.gle/QCjXZXioTk5V4wTh9)** **and [Join the WhatsApp Group Founders & Startups Poker Night ](https://chat.whatsapp.com/HZqJkAGiXQ51GECyLiQohZ)[♠️](https://chat.whatsapp.com/C02KYYSMS8cGgKocAoOhkk) where I will be sharing more details later**

* German below -
Please bring clean indoor shoes with you to the location <3 The event fee varies between 5 to 10 Euros. 

Hey You!
On Friday I will teach you a few basic steps of shuffling. We will break down the steps, in your time, in your style.
We will explore your own flow of your body to different kinds of music and how we can use it in shuffling. I want to create a safe space for everyone who is just starting their shuffle journey or is already on the path. 

Address:
Milastraße 4
10437 Berlin
“Aziza-tanzt Tanzschule” 

Hallo Du!
Diesen Freitag möchte ich Dir ein paar Basic-Schritte vom Shufflen zeigen. Wir werden die Schritte langsam durchgehen, in deiner Zeit, in deinem Tempo.
Wir werden den eigenen Flow entdecken und wie Du deinen Körper zu verschiedner Musik im Shufflen integrieren kannst.
Ich möchte für jede Person einen Safe-Space erschaffen, egal ob Du ganz Neu bist oder schon etwas gelernt hast. 

Adresse:
Milastraße 4
10437 Berlin
“Aziza-tanzt Tanzschule”

🍕 **Data & AI Lunch Meetup – Pizza & Exciting Conversations** 🍕 The next **DVC Data & AI Lunch Meetup Berlin** is coming up! We’ll gather for a **shared lunch** and discuss everything around **Data & AI**. **When:** Friday, May 29, 2026, 12:30 PM **Where:** Monte Mente, Das Center am Potsdamer Platz **Cost:** Self-pay **Topic:** Exchange on Data & AI Join us for a great time of pizza and discussion on the latest developments in the **data world**! Looking forward to an exciting exchange with you! 🍕🤝 [#Data](https://www.datavaluecreation.com/search/posts?query=%23#Data) [#AI](https://www.datavaluecreation.com/search/posts?query=%23#AI) [#Meetup](https://www.datavaluecreation.com/search/posts?query=%23#Meetup) [#Networking](https://www.datavaluecreation.com/search/posts?query=%23#Networking) [#Innovation](https://www.datavaluecreation.com/search/posts?query=%23#Innovation) [#DataStrategy](https://www.datavaluecreation.com/search/posts?query=%23#DataStrategy)

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

Westerville Pride Festival Sat\. June 6\, 2026 \| 5 PM \- 8 PM If you're thinking of attending, or being a sponsor, vendor, or volunteer, visit our website at https://www.westervillequeercollective.org/pride for more information! Location and other info will be announced soon :)

**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)

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.

Couldn't make Knowledge? Or want to debrief the dancing robots or Autonomous Workforce? Join us for a Knowledge '26 recap, insights sharing, a couple rounds of golf, and fun at Topgolf. As always, drinks and food will be provided. More details to come — mark your calendar, RSVP, and save your spot today!

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.

**✅ Bachata Mondays with Todd Smith!** **👉 Beginner Bachata Class** **$15 In Advance / $20 At the Door** . 7:00 pm – 7:15 pm … Registration 7:15 pm – 8:15 pm … Beginner Class . **👉 Intermediate Bachata Class** **= $15 In Advance / $20 At the Door** . 8:15 pm – 8:30 pm Registration 8:30 pm – 9:30 pm Intermediate Class . **👉 If You Take Both Bachata Classes** **= $25 In Advance / $35 At the Door** . **👉 Buy Advance Tickets Now at:** . https://columbussalsadancing.com/bachata-mondays-dance-class-tickets/