Contractors

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 🕒 **Agenda** 18:30 – Doors open 19:00 – Talk + Q&A 20:40 – Pizza, Drinks and Networking \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- **RSVP now to save your seat!**

! All sessions in English except for 24.03, 21.04, 09.06, 28.07 & 01.09- these sessions will be in German ! Wanting to connect deeper with your partner? Looking for new ways to be intimate? Hoping to foster love, awareness, and communication in your relationship? Take some quality time away from the daily grid and explore Tantra together through embodied practice. The practice is designed to foster deeper intimacy, attunement and harmony between the two of you. Tantra invites you to allow your life force energy to flow without inhibition and to cultivate it for self-realization. Part of the practice is about inviting in more opening. Openness creates union, resistance creates separation. Deep connection, more pleasure and joy are a result of experiencing more openness. Tantra is for everyone! All couples are welcome regardless of sexual orientation and experience level. Not in a romantic relationship? Feel free to bring anyone you'd like to practice Tantra with. **What to expect:** * **Discourse, demo practice and Q&A**: learn about Tantra through discourse, ask your questions * **Tantra meditation practice**: presence, movement, sound and breath * **Sharing before and after practice**: share about your fears and desires & reflect on your experience * **Cozy studio setting**: enjoy a comfortable and intimate environment * **No partner-exchange:** practice only with your partner * **Fully clothed:** you may keep your clothes on during the entire practice **What to bring:** * Wear comfortable clothing * Water bottle to stay hydrated **Tickets:** 69€ per couple. Please purchase your ticket via [sophieheldens.com](https://www.sophieheldens.com/tickets?utm_source=meetup&utm_campaign=datenight) **Location:** Praxis Köpi Köpenicker Straße 175 10997 Berlin Kreuzberg Walk to the second courtyard and take the stairs to the front door on the left. **Please note:** Praxis Köpi is located on the 5th floor and there is no elevator available. Only book a ticket if you can walk the stairs. The benefit: a beautiful private studio with loads of natural light. **!! Please arrive 10 minutes early so we can start on time !!** Once we start the session, I can’t let you in anymore because it disturbs the class. Please do yourself and the group a favour by coming on time. Thank you! **Workshop facilitator** Hi! My name is Sophie. My passion for Tantra is rooted in a deep spiritual yearning and an inner knowing that Tantra is my path. My desire to teach Tantra has been sparked by having witnessed my own growth and healing as a result of these practices and it is inspired by a vision to create a more beautiful world. I create a space that is loving and nurturing, with a strong emphasis on ensuring that you feel save and supported. My workshops are gentle yet transformative, spiritual yet grounded and always heart-centered. I'm passionate about bridging the wisdom of ancient Tantra with modern-day practices. For more information, feel free to visit my website: [www.sophieheldens.com](https://www.sophieheldens.com?utm_source=meetup&utm_campaign=datenight)

Today we are working at Moxy Humboldthain, near Gesundbrunnen train station, with big desks and available food/drinks. Note: We use Telegram for communication [https://spam-destroyer.com/check/jelly](https://spam-destroyer.com/check/jelly) 😴 Tired of working by yourself? 🌡️ Too hot to work at home? 🍫 Contents of your fridge or your laundry distract you 💻 Come join other freelancers and remote workers for coworking ☕️ There are no membership requirements, free WiFi, some power sockets, a large desk, some affordable coffee, toasted sandwiches and drinks! ⏰ We'll be there from 10:00, but feel free to stop by any time. • WHAT TO BRING • Whatever you need to work on your own project / tasks :) • QUESTIONS? • Join our Telegram chat group to ask any questions: [https://spamannihilator.com/check/jelly](https://spamannihilator.com/check/jelly) • MORE EVENTS? • To have more events, we need more organisers. If you would like to help out, please get in touch [😀](https://emojipedia.org/grinning-face/)

Wie beschreibst du Freundschaft? Join us for our next German Sprachcafe as we cover the topic of Freundschaft (friendship)! Our event begins with a brief moderation at 19:00 where the host will introduce the topic, explain the conversation guidelines, and create groups of different German ability. In your group you will converse with a native German speaker on the topic of Freundschaft. What is friendship to you? How do you grow in friendship? What do you look for in a friend? What makes you a good friend to others? These topic and more will be discussed with the participants in each group. So practice your German, whatever your level. Make mistakes, have fun, and improve in your language ability. Light snacks and drinks will be served to people in attendance. This event is free of charge! Our event officially ends at 20:30. Weather your just starting learning German, an intermediate, or growing in your language abilities, you are invited to join! This event is hosted by [Zoarkirche](https://efg-zoar.de/) and [Community Church Berlin](communitychurchberlin.de)

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)

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

Tired of working solo from home? Craving good coffee and a dose of human connection while you tick off your to-do list? Join us for our **weekly coworking cafe session every Tuesday** – a casual space for remote workers, freelancers, creatives, and anyone who loves the idea of working together instead of alone. 🌿 *** **📍 Location:** The social hub ( https://maps.app.goo.gl/tjQwRDCTwHHNg9tG6?g_st=com.google.maps.preview.copy )**📌 Important Note:** We’ll be **reserving a table at The Social Hub every Tuesday**, so if you RSVP, please make sure you can attend. If your plans change, kindly **update your RSVP in advance** so others can take your spot and we can manage the reservation better 🙏 The Social Hub is a **great space to work** — comfortable seating, reliable internet, good coffee ☕, and food options available if you’d like to grab something while working. **🕙 Time:** 9:30 AM – 16:00 PM (Join when you can, leave when you must but if you want to sit with the group then please do come by 10:00 AM) **🎯 Agenda:** Work side by side, get inspired, and share a few laughs (and maybe a croissant). Whether you're deep in focus or need a nudge to stay productive, you’ll be in good company. *** **Why join?** ✔️ Stay motivated ✔️ Get sh\*t done ✔️ Make new connections ✔️ Share ideas, inspo, and mini brain breaks ✔️ Enjoy great coffee & cozy vibes ☕ There’s no rigid structure – just a friendly, respectful atmosphere to **work quietly**, **chat during breaks**, and build a rhythm together. **💬 Notes & Community Vibe:** 🌈 This space is **LGBTQ+ friendly**, and we’re committed to creating a **safe, welcoming, and inclusive environment** for everyone – no matter your background, identity, or how you work. 🔁 This event happens **every Tuesday** – so if you miss one, no worries! You can always RSVP for the next. 👥 We’re trying to build a small, consistent **community**, so spots are **limited** to keep the vibe cozy and collaborative. 🔌 Bring a charged laptop – outlets may be limited 🍽️ Please support the hotel by ordering a drink or snack

***Welcome to the Actors Gym!*** * A fun, supportive training ground where actors play, experiment, and build their craft. * *Through engaging games and exercises, you’ll develop core acting skills and bring them to life by performing a short script at the end of every session.* * This drop-in class welcomes both new and intermediate actors eager to learn, stretch, and have fun. ‍ **DURATION:** 60 – 90 mins (depending on numbers) **ABOUT YOUR COACH:** Geoff is a dedicated professional teacher and actor. He is also active as a writer, director and producer of small-scale projects here in Berlin. He has performed on many stages – as actor, host, and improvisor – and in many short films, across the UK and Germany. He loves to meet and work with new actors, and has a real passion for discovering new talent. His acting profile may be found [HERE](https://www.filmmakers.eu/en/actors/geoff-mills). ‍ **SPOTS:** Everyone is welcome. Beginner-friendly. €15 General Admission (*pay at venue*) Free to members of [DNA Arts](https://www.dna-artclub.com/) \- a vibrant community of artists and performers\. **DNA** members have access to over 5 dance classes and 5 creative workshops each week, covering everything from singing, writing, and marketing to theatre, including also 5+ shows weekly, all completely free for our members.

Today we are working in a beautiful location at Alexanderplatz with desks, power sockets, free WiFi, available food/drinks and air conditioning. We will be working on the second floor of the building with a beautiful view of the Fernsehturm. NOTE: We don't share the venue location publicly. Find out where it is by joining our Telegram chat group: **[https://spam-destroyer.com/check/jelly](https://spam-destroyer.com/check/jelly)** 😴 Tired of working by yourself? 🌡️ Too hot or too cold to work at home? 🍫 Contents of your fridge or the laundry distracting you? 💻 Come join other freelancers and remote workers for coworking! ☕️ There are no membership requirements, free WiFi, some power sockets, a large desk, some affordable coffee, toasted sandwiches and drinks! ⏰ We'll be there from the start time, but feel free to stop by any time. • WHAT TO BRING • Whatever you need to work on your own project / tasks :) • QUESTIONS? • Join our Telegram chat group to ask any questions: [https://spam-destroyer.com/check/jelly](https://spam-destroyer.com/check/jelly) • MORE EVENTS? • To have more events, we need more organisers. If you would like to help out, please get in touch [😀](https://emojipedia.org/grinning-face/)

The Language Café is primarily aimed at people who are struggling with their mental health which can make it hard to go to regular courses. We want to create a safe space for everyone to learn and practise without pressure. Everyone is welcome! Please try to be on time so we can all get started together :) We mainly practise on a beginner/lower intermediate level and adapt to everyone's prior level of German. The Language Café will focus on teaching you the most important words and phrases and basic grammar in German. The content of the course is adapted to real life. (everyday life in Germany, dealing with authorities, etc.) We will cover different topics every week and you can join us anytime, since the topics do not necessarily build on each other. The Sprachcafé is for free. \*If you cannot make it please cancel your participation so someone else from the waiting list can join, thank you!\* \| \| \| \|

**Build for Everyone — Accessibility for Mobile** Flutter Berlin is hosting a joint meetup with Kotlin User Group Berlin and CocoaHeads Berlin, focused on building accessible mobile apps. **Location:** Hedwig-Dohm-Haus, Berlin We’ll cover both strategy and hands-on implementation — from understanding platform differences (Android, iOS, cross-platform) to real-world accessibility pitfalls and live testing. With: **Important:** Registration is via Luma, not Meetup. Please register here: https://luma.com/xo7d3vb4

**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)**

**Investors Networking Meetup: How to Build a Purchase Pipeline with Achim Amann, CEO of Black Label Properties, with + 1.000 transactions in the last 20 years** Many investors manage to acquire one property. Far fewer build a reliable **purchase pipeline** that allows them to scale strategically over time. In this meetup, we focus on exactly that: how to think **beyond single transactions** and develop a structured approach to s**ourcing, evaluating, and executing deals**, while aligning your investments with smart tax strategies. Join us on **May 29th at 4:00 pm** at the Black Label Villa for an afternoon of practical insights, open discussion, and high-level networking with serious investors and like-minded professionals.

**Berlin, let’s talk agents. 🚀** We’re bringing the local AI community together for another evening focused on the fast-evolving world of **generative AI and autonomous agents** — and how teams are turning them into practical, scalable solutions. The meetup will feature a short session on what it really takes to **operationalize AI agents**: from design and deployment to oversight, orchestration, and management in production environments. After that, the floor is yours — with plenty of time to meet other builders, exchange perspectives, and continue the conversation over food and drinks. **What to expect:** 🎤 A featured talk on building and managing AI agents in practice 👀 A closer look through live demos 🤝 Informal networking with AI practitioners, builders, and innovators 🍻 Discussions with the Berlin data & AI community over drinks and pizza Whether you’re already experimenting with multi-agent systems or just starting to explore the space, this meetup is a chance to hear how others are approaching the challenge, share ideas, and connect with peers in Berlin.

**Important time note:** Please plan on arriving between 5:30 and 6:00 as the elevators lock after 6 and you'll need to message us and we'll need to come get you. The building address is 4450 Bridge Park The entrance is 6620 Mooney St, Suite 400 You will need to scan your ID at the door to get a visitor badge. **Abstract** Like it or not, AI agents are now capable of turning a quickly written paragraph of requirements into a pull request that is ready to be integrated into real-world production applications and it's now our responsibility to make sure AI doesn't go rogue and take down prod - or corrupt our data by misunderstanding the requirements or our existing schemas. In this session we'll explore strategies to protect our codebases through unit and integration testing, documentation, and code review along with additional ways of providing context and guard rails to our AI agents as they carry out the work we've assigned them to do. By the time we're done, you'll have a firm grasp of the problem and understand some helpful options for protecting your codebase from vibe coding mishaps getting YOLOed into prod. **YouTube Link** TBD

It’s time to take control of your mental health. How do you get rid of stress, anxiety and uncertainty? These emotions are buried deep in your reactive mind. Find out what the reactive mind is, and in the process find yourself. Have you ever suffered from a traumatic experience, a deep loss or been through a painful breakup? Has your ability to communicate suffered as a result? And after that, even though you "moved on" did you find that things were never quite the same? Have you ever looked at childhood photos, or reminisced your early life and wondered where that happiness and spark went? Are your emotions out of your own control? Have you ever felt, even if you aren’t aware of it, that possibly you are getting in your own way of your happiness and success? How does this affect your self-confidence? Find out what is at the root of all stress, anxiety, depression and self-doubt. Find out how and why you hold yourself back from achieving your goals and having the life you have dreamed of. As soon as you learn what is at the root of these unwanted conditions, you’ll see it is something you can DO something about. You will not be labeled or categorized at this MeetUp.

Some trained COUNT volunteers work together once a month at RMH (http://www.rmhc-centralohio.org/volunteer.php) as Housewarmers (usually on the 1st Sunday from 1 – 5 PM). Some schedule other shifts at their convenience. You may try this out with less fuss by following a "Fast track" or go through the normal process. Fast track • Arrange a time to shadow a COUNT volunteer. Call Dave Nohle at 614-268-9558 (cell). • Show up and try it out. • Complete application, etc. later. Normal process • Complete an online application (http://rmhc-centralohio.org/volunteer/). • Attend orientation in advance. • At orientation you will complete forms agreeing to keep family/patient info private and allowing a background check and tour the facility. • Complete one training shift. Daily shifts are: morning 9 AM - 1 PM, afternoon 1 - 5 PM and evening 5 - 9 PM. • Schedule shifts online using the on the RMH scheduling system (http://www.volgistics.com/ex/portal.dll/?FROM=32895). The Ronald McDonald House (RMH) provides housing and meals for families with sick children. The Columbus RMH is the largest in the world with 137 rooms. COUNT has been volunteering there since May 2014. Housewarmers work with RMH guests to provide a home-like environment - greet, assist with family needs, answer phones, give tours, assist with checkin/checkout, prepare guest rooms after checkout, clean facility, laundry, restock supplies and staff the front desk. RMH Housewarmers volunteer at least one four-hour shift a month. All Housewarmers must complete an application and agree to a background check before they can be full fledged volunteers.

Feeling down? Sometimes depressed? Can't focus? Negativity & stress? Recent losses? Creativity in career and personal life hindered by mental blocks? Sometimes we never fully recover from traumatic experiences. Whether it was yesterday, last week or a year ago, traumatic experiences - a loss of a loved one, losing a job, a breakup - can leave you scarred. You talk about it and feel a little better, but it never goes away. After you hang up the phone, it's still there; the sadness, the cloud, the over-thinking, the worry, the guilt. You try to focus, but you're blocked. You try to look forward into new experiences, new relationships but a cloud is hanging over you, casting a shadow on what you once considered a bright, cheerful future. What happened to your courage? Your strength of character? You're 'why not' attitude? Whoever said 'time heals' must have had a special time machine, because after weeks, months, years, you're wondering - when exactly does that kick in? Sometimes it seems like drinking or drugs are the way to go. But they wear off, and now the problem is still there with added side effects from the drugs. At this free local Meetup event we will talk about: * What causes grief, anxiety and depression to become chronic. * Is it possible to regain your joy and happiness even after traumatic experiences? * How to break away from negativity and focus on the future * What are the steps to take to get control of your mind and your emotions? Learn about a safe, gentle, do-it-yourself counseling that can be done in the comfort of your own home. Let's explore safe, effective solutions for healing from traumatic experiences. Be sure to click on the red "Attend" button below to come to the event. We look forward to seeing you there. This group is sponsored by the Dianetics & Scientology Life Improvement Center.

Bring your business cards and network in person with other business professionals! Gold Star Referral Clubs is one of the most established professional networking organizations in the country, with multiple groups in central Ohio. Join us!

**How to take control of your subconscious and harness its power!** Join us for an eye-opening lecture where the speaker will break down complex ideas in a clear and practical way. You’ll gain insights into: ✅ The true definition of the subconscious ✅ How it generates unwanted emotions ✅ Its real purpose and function ✅ What determines the pressure it exerts on you And the most important topic: **How do you take control of your subconscious!** But this isn’t just another lecture where you sit and listen passively. It’s interactive and engaging—you can ask questions at any time. 📅 Reserve your spot now! Seats are limited, so don’t wait too long to sign up. Location: 1266 Dublin Rd, Columbus, OH 43215 Hosted by the Hubbard Dianetics Foundation

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!