Scalability

The next **Berlin C++ Meetup** hosted by think-cell takes place on **Tuesday, May 26**. Join us for an evening with the Berlin C++ community! This meetup is a chance to step away from your day to day work, meet other developers, exchange ideas, and have real conversations about modern C++ in a relaxed setting. \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- ## **Talk** ### **Contract assertions on virtual functions** *Timur Doumler – Citadel Securities* Contracts assertions were introduced in C++26, but they cannot be applied to virtual functions. To close this gap, we first need to answer the question: how should contracts assertions behave in the presence of inheritance and runtime polymorphism? In this talk, Timur explores why this problem is harder than it looks. He reviews existing approaches from other languages, such as Eiffel, D, and Ada, highlights why they don’t fully translate to C++, and outlines the key design challenges involved. He then presents a concrete proposal for how contract assertions on virtual functions could work in C++, balancing correctness, safety, and usability. Along the way, the talk touches on good API design, the true meaning of the Liskov substitution principle, and how to reason about program correctness. \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- 📅 **Date & Time:** Tuesday, May 26, 2026 – 18:30–21:30 📍 **Location:** Le Wagon Coding Bootcamp, Rudi-Dutschke-Straße 26, 10969 Berlin 5th floor 🕒 **Agenda** 18:30 – Doors open 19:00 – Talk + Q&A 20:40 – Pizza, Drinks and Networking \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- **RSVP now to save your seat!**

We are back in the c-base! Do you already run NixOS and want to talk to other people or want an introductory session with some NixOS users. Just bring your machine! Usually there are no topics, we just sit in front of our computers, talk about stuff, debug some problems or review some PRs on nixpkgs. There are drinks usually available from the c-base bar. If you can't find us. just ask around or ask in irc (#krebs on hackint)

Wir bieten allen Interessierten die Möglichkeit, mit Elektronik zu basteln. Workshops und Vorträge zu verschiedenen Themen rund um Elektronik und Software sind willkommen. Von Arduino bis zu komplett selbst entwickelten High-End Schaltungen sind wir für alle kreativen Ideen offen. Wir haben auch Gruppen rund um das Nähen, Programmieren, Retro Computer. Wir treffen uns immer am Dienstag und am Freitag ab 18:00 Uhr. Egal ob Anfänger oder Profi – hier seid Ihr jederzeit Willkommen. Ihr könnt mit anderen fachsimpeln oder auch mit unserer Hilfe Eure ersten elektronischen Gehversuche starten. Wenn zeitgleich in den vorderen Räumen Workshops oder Vorträge stattfinden, kann hinten Werkstattbetrieb stattfinden.

Join our Women’s Circle at "Das Kabbalah Centre" in Berlin, hosted by Rachel Wende. Language: English. This event is open for new and current students. Amount: EUR 05.00 - 15.00 [Register here](https://onehouse.kabbalah.com/de/events/womens-circle-rw-26mai26-1778598265129619/) Living a purpose-driven life is something we all strive for. Such a life promises that we are using our talents, sharing of ourselves, and working towards goals that are fulfilling and inspiring. Staying on the path requires daily effort and yet, with all the responsibilities that we have as women, sometimes that purpose-driven life seems like a worthy goal for sometime after we’ve fulfilled the needs of our partners, children, and jobs. Join us for an intimate women’s circle as we share insights and tools for how to revitalize our search for our purpose. Learn how to get out of patterns and routines that keep us from making the changes we deeply desire. Our path to fulfillment lies within each of us; we only need to tease it out. The Kabbalah Centre Berlin Hauptstraße 27 Entrance E / 1 Floor 10827 Berlin

Planning to go on parental leave while working in tech? You probably have a ton of questions, and we will do our best to get you answers. Whether you're expecting, currently on leave, planning ahead or wanting to support your teammates, navigating parental leave comes with a lot of new challenges. Technical careers require us to stay up to date and living in Germany adds another layer of bureaucratic hurdles to the mix. To help you feel more prepared, we have selected panelists who've been through it and will share their experiences openly: what worked, what surprised them, and what they wish they'd known. We'll cover the practical and bureaucratic side, the career side, and we'll reserve time for your questions. **🗓️ Agenda** 6:30 Arrival and networking 7:00 Welcome and Intro 7:10 Panel Discussion: Planning Parental Leave in Tech 9:00 Event ends **Panel: Planning Parental Leave in Tech** ● **Saranya Parvathi Ganesan**, Senior Software Engineer @Immoscout24 ● **Sinny Kumari**, Associate Engineering Manager @Red Hat ● **Vanessa Ating**, Senior Frontend Engineer ● Moderated by: **Vaishali Thakkar,** Confidential Computing Expert @SUSE **🍕 Food and Drinks** There will be vegetarian and vegan food and beverages sponsored by our host Bettermile. 🗣️ **About the Panelists** **Saranya** I’m a mother to a four-year-old daughter and currently work as a Senior Software Engineer at ImmoScout24. I have over 12 years of experience in software development, primarily in backend engineering with Java, Kotlin, AWS, Node.js, and serverless technologies. Prior to moving to Germany, I worked as a Software Engineer at PayPal and Ford in India. I’m passionate about mentoring, continuous learning, and staying hands-on with technology while building scalable and reliable systems. **Sinny** [Sinny](https://sinnykumari.wordpress.com/) is a mother to a four-year-old and an Engineering Manager at Red Hat. Prior to stepping into engineering leadership for the [DNF](https://en.wikipedia.org/wiki/DNF_(software)) team, she spent over a decade as a Software Engineer developing core OpenShift [operators](https://github.com/openshift/machine-config-operator), performing ABI analysis, and more. She is also an Open Source enthusiast and has contributed to projects such as Fedora and KDE. **Vanessa** I’m a Software Engineer with over five years of experience building scalable, accessible web applications across the full stack. I specialize in frontend development with React, TypeScript, and Next.js while also bringing solid backend experience to deliver complete end-to-end solutions. I’m passionate about creating design-driven interfaces that deliver real value to users. 📍**About Bettermile** We’re Bettermile, and we’re essentially here to fix the parcel logistics. We’ve built an AI-powered SaaS suite that turns the chaos of dynamic routing and complex addresses into a smooth, efficient experience. Based in Berlin-Kreuzberg, we’re a 150-strong international crew (36 languages and counting!) that ditches the corporate ego for creative freedom and actual autonomy. With flexibility, a kid-and-pet-friendly office, and a culture that’s high on drive, we’re setting a new standard for last mile. **☂️ About the FLINTA label** This event is labeled as FLINTA (women, lesbians, intersex, non-binary, trans and agender) as we make it a mission to empower women and other underrepresented minorities in the tech community. 💗 **Code of Conduct** We are dedicated to providing a safe and welcoming experience for everyone who participates in our events. By attending our event, you agree to the Berlin Code of Conduct: https://berlincodeofconduct.org/en 📸 **Media Consent** We may be taking photos of this event for social media posts. If you do not want to be photographed, please let the organizers at the event know. We will make sure to respect your privacy. 👋 **About Empowered in Tech** We are a local community in Berlin dedicated to empowering FLINTA (women, lesbians, intersex, non-binary, trans and agender) people to excel in their tech journey. Our events offer study groups, technical workshops, hackathons, networking events, panel discussions, lightning talks, and social events. Stay in touch with the community! Join our Slack: [https://bit.ly/EmpoweredInTechSlack](https://bit.ly/EmpoweredInTechSlack)

BHNT #112: the fifth BHNT in 2026. The title is inspired by the issues around Bambulab (Boo). Your hacks do not have to be connected to the title (bonus points if they do though) Please RSVP and bring your hacks! There are 8 dynamically allocated Slots that consist of 5min presentation + 5min conversation with the audience. To refresh your memories or get familiar with the concept - see some old hacks here: [https://bhnt.c-base.org](https://bhnt.c-base.org/) Hope to see you - looking forward! [RSVP here](https://platform.openmeet.net/events/bhnt-112-bamboo-hacks-8zv0v)

Women Techmakers Berlin and SPICED Academy are joining forces to host an evening focused on both building *efficient AI systems* and navigating the real challenges of building a *career in tech*—beyond just learning technical skills. ## Talks Talk 1: Confidence Beyond Skills - What Really Holds Women Back in Tech Careers - by Marina Matveevskaia Many women in tech keep investing in new courses, skills, and certifications, yet still feel stuck or “not ready enough” to take the next career step. In this talk, we will look beyond technical competence and explore the less visible factors that often shape career growth much more strongly — such as self-trust, fear of visibility, internalized expectations, and the emotional impact of burnout or layoffs. I will share common patterns I see in highly capable women and why “just improving skills” is often not the real barrier. Participants will leave with new perspectives and simple reflection tools to better understand what is holding them back and how to move forward in a more sustainable and aligned way. Talk 2: Efficient Agentic Systems - by Jane Waithira Let Classical ML Do the Heavy Lifting, Let Agents Do the Thinking There’s a temptation to throw an LLM at every problem—but the most effective systems take a different approach. This talk explores how to combine deterministic, classical machine learning for predictable tasks with LLM-powered agents for reasoning and decision-making—so you can build systems that are fast, cost-effective, and reliable. ## Speakers **Jane Waithira:** Jane Waithira is an innovative, solution-oriented developer working in AI/ML, currently at SAP in Germany, where she integrates applied AI and GenAI for SAP's own cloud infrastructure. With over five years of experience building production AI systems, Jane has established her skillset in practical applications of ML and GenAI. Her talk will provide attendees with a practical framework for building efficient agentic systems that combine deterministic classical ML with the flexibility of LLM-powered agents. [https://www.linkedin.com/in/waithira-macharia/](https://www.linkedin.com/in/waithira-macharia/) **Marina Matveevskaia:** Marina Matveevskaia is a Professional Identity and Transition Coach working primarily with women in tech and international professionals in Germany. With over 14 years of experience in the IT industry, including leadership roles, she understands the unique pressures and challenges women face in fast-paced, male-dominated environments. In her coaching practice, Marina focuses on burnout prevention, impostor syndrome, and career transitions, helping highly capable women build sustainable and fulfilling career paths. She also collaborates with the German Employment Agency (Arbeitsagentur) as an AVGS coach, supporting women in their return to the labour market. [www.linkedin.com/in/marina-matveevskaia](http://www.linkedin.com/in/marina-matveevskaia) ## Why Attend? * Learn from women working in Tech * Get inspired by real stories and practical advice * Connect with like-minded people in a supportive space * Discover career paths across Tech & AI * Network with the WTM & SPICED community Join us for an evening of inspiring talks, practical insights, and meaningful connections in the heart of Berlin’s tech community. ## About SPICED Academy SPICED Academy is a Berlin-based tech bootcamp that helps people transition into tech through intensive, hands-on training. They offer both in-person and online programs across data analytics, data science, web development, and AI, with a strong focus on real-world projects and career support. https://www.spiced-academy.com/en ## Inclusivity Statement Women Techmakers Berlin is committed to creating a **safe, inclusive, and welcoming space**. This event is open to people of all genders who support diversity in tech.

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** *by Blagoja "Baki" Stamatovski* **👉 TBD** **Speaker Bios:** 🗣 **TDB**

🕢 Doors open at 18:30 and sessions start at 19:00. Freestyle vocal workout at and play session. €8-20 😌 Flow is a state of being… an experience when you allow yourself to be 100% fully engaged in the present moment in a feedback loop between clarity and satisfaction. It is an undeniable sensation where things seem to be more effortless, pleasurable, in sync, and you can easily sense a connection with something greater than yourself; this is what we will create…: • a connected and mindful meditation where it is possible to blissfully surf the cutting edge of the present moment together… • a game where it’s possible to feel excited and calm in the same moment, and everyone can win as much as they like… Scott Bolden, founder of Das Baumhaus Berlin will share some very easy, practical and effective methods developed during the last 12 years of facilitating the “Improvisational Groove Orchestra” (I.G.O.) improv vocal jam sessions. Within 20 minutes participants learn to use the common sound space to create resonance in the form of improvisational music where it is quite common to experience some real flow moments… It is very easy to participate, no musical talent or training is required so anyone is welcome to join. All of the session is done with eyes closed to avoid visual distractions and keep focus on the co-created sound space. During these sessions we will also have short breaks for feedback and refreshment. Important – Please be on time. It is very important to understand the methodology and warm up in the group before joining in! 🎤 @21:00 - Freestyle vocal workshop and practice session. €8-15 Have you ever wanted to learn how to do freestyle vocalizations? Maybe you are on your way and would like to just have a fun workout session with other vocal freestyle enthusiasts. All levels welcome. Links to sound samples - https://www.baumhausberlin.de/events/flow-a-guided-vocal-sound-bath-meditation/

Join us for an evening on the practical side of AI agents. We'll dig into context engineering and why relevance matters more than prompt tricks, then look at what it takes to run autonomous agents safely alongside humans. Food and drinks provided — stick around after for networking. ✍️ RSVP asap as capacity is limited so grab your spot asap! 📅 **Date and Time** Wednesday, May 27, 2026 from 18:00-20:45 📍 **Location** [EBCONT office, beyond Quartier Heidestrasse, 34, 10557 Berlin](https://maps.app.goo.gl/aQGPgteqhQ2yrmx96) 📝 **Agenda** 18:00 – Doors open, arrivals and check-in 18:20 – Welcome note by EBCONT 18:30 – **Agent Builder Hope is not a strategy — relevant context for data driven agents** by Anderson Queiroz — Elastic *What are agents and context engineering? And why we think the "center of gravity" for context engineering is much more about relevance and your data than only prompts and memory management.* 19:00 – Q&A & quick break 19:15 – **Adapting to AI in Security** by Jenny Pinheiro — Tines *Best practices for autonomous AI and human interaction in the context of workflows.* 19:45 – Pizza, drinks & networking \*\*\* Invite your friends and join us for an evening of learning and networking with fellow engineers and speakers! Thank you to **EBCONT** for hosting and to **Tines** for teaming up with us on this one!

**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)).*

Women’s Full Body Strength, Hormonal Balance & Body Confidence A welcoming women-only personal training class designed to help you feel stronger, more confident and more connected to your body. Through a mix of full-body strength training, body sculpting, conditioning and supportive coaching, you’ll improve fitness, build strength and support your overall hormonal wellness in a positive and empowering environment. This class also focuses on women’s health, including: • PCOS-friendly training • Hormonal balance & metabolism support • Stress-conscious and sustainable exercise • Building confidence and body awareness Suitable for beginners to intermediate fitness levels. NOTES: * Wear comfortable activewear that makes you feel confident and free to move * Use clean shoes or socks * Please bring water and a towel * Arrive 5 minutes early so you can settle in and enjoy the session.

This is another event from the "All in Kubernetes" event series. This group is focused on using Kubernetes for everything. All in Kubernetes. Data, databases, AI, ML, and all kinds of stateful workloads on Kubernetes and Talos. *** **Schedule:** 6:00-6:30pm - Open doors, pizza, drinks & networking 6:30-7:15pm - (Em)Powering Postgres with Talos and Simplyblock - [Chris Engelbert](https://www.linkedin.com/in/noctarius/?utm_source=luma), Simplyblock 7:20-8:05pm - How Talos Makes It Easier To Build a Cluster Management Platform - [Utku Özdemir](https://www.linkedin.com/in/utkuozdemir/?utm_source=luma), Sidero Labs 8:05-8:45pm - Drinks & Networking **​Who Should attend:** Anyone interested in talking and learning about Data, AI and Stateful workloads on Kubernetes and Talos. ​ **When & Where:** May 27th, 2026, 6:00pm Antler office, Jägerstraße 32, 10117 Berlin Sponsored by [Sidero Labs](https://www.siderolabs.com/), [simplyblock](https://simplyblock.io/) and [Antler](https://www.antler.co/)

**Bob on Tour – IBM Bob live erleben 💙** Wie fühlt sich ein agentischer Coding Assistant im echten Entwicklungsalltag an? Bei **Bob on Tour** kannst Du IBM Bob gemeinsam mit Expert:innen hands-on ausprobieren. In einem eintägigen, technisch fokussierten Format arbeitest Du an realistischen Coding-Aufgaben, von geführten Labs bis zur Anwendung auf eigene Use Cases. Dabei lernst Du, wie Bob Entwicklungsworkflows ergänzt, Codebasen verständlicher macht und mehrstufige Aufgaben unterstützt. **Das nimmst Du mit:** ✅ Sicherer Umgang mit den wichtigsten Bob-Funktionen ✅ Praktische Erfahrung mit agentischer Coding-Unterstützung ✅ Impulse für reale fachliche und technische Problemstellungen 👉 **[Jetzt anmelden und IBM Bob live erleben](https://luma.com/5g0x9318)**

**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** https://youtube.com/live/BltmWMH1zG0?feature=share

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

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!

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! 📖

QA or the Highway is a one-day, affordable, regional, professional conference featuring real-world experience and thought leadership in the QA and testing industry. This is a ticketed event please register here: https://www.qaorthehwy.com/ Featured Keynote Speakers: **Matthew-Hope Eland** **(Wizard at Leading EDJE)** \- An AI Specialist and Wizard at Leading EDJE who is known to teach software engineering\, AI\, and data science concepts in the most ridiculous ways possible\. Matt has used machine learning to settle debates over whether Die Hard is a Christmas movie\, reinforcement learning to drive the behavior of digital squirrels\, data analytics to suggest improvements to his favorite TV show\, and AI agents to play board games and create an AI agent with the personality of a dog\. Matt is the author of "Data Science in \.NET with Polyglot Notebooks" and "Refactoring with C\#" as well as several LinkedIn Learning courses\. Matt helps organize the Central Ohio \.NET Developer Group\, runs several blogs and a YouTube channel\, has a Master’s of Science in Data Analytics\, and is a current Microsoft MVP in AI and \.NET\. **Tatyana Arbouzova** **(CEO at Innovate QA)** \- Tatyana Arbouzova is an engineering and business leader with a strong background in Quality Engineering across multiple industries\, including Big Tech\, Healthcare\, and Entertainment\. She has held leadership roles at world\-class companies such as Microsoft\, VMware\, Disney\, and The Pokémon Company International\, where she focused on building quality\-driven cultures and scaling teams to deliver high\-impact products\. With decades of experience\, Tatyana has helped organizations transform their quality practices so teams can deliver software efficiently\, confidently\, and with measurable business outcomes\. Today\, Tatyana advises software companies on adopting AI to optimize quality practices and improve how software is delivered at scale\. She is also a passionate community builder and the founder of Innovate QA\, a thriving Seattle\-based community and conference for quality professionals\.