Mapping

📆 Agenda * 19:00 Welcome to the PUB (Python Users Berlin) – setting up * 19:15 Main talk * 20:00 Lightning talks * 20:30 Social gathering 🎙 Main talk by [Sam Bail](https://www.meetup.com/de-DE/members/57634242/): PySpark PySpark is a powerful library that brings Apache Spark’s distributed computing capabilities to Python, making it a key tool for processing large-scale data efficiently. In this talk, data engineer and analyst Sam Bail provides a structured and hands-on introduction to PySpark, starting with an overview of Apache Spark, its architecture, and its ecosystem, such as Databricks. Learn about Spark’s core concepts, such as the DataFrame API, transformations, lazy evaluations, and actions, before setting up a lab environment and working with a real dataset. Plus, gain insights into how PySpark fits into a broader data engineering ecosystem and best practices on running PySpark in a production environment. 👩‍💻 About [Sam Bail](https://www.meetup.com/de-DE/members/57634242/) Data engineer and engineering leader with 10+ years building platforms and teams across healthcare, marketplaces, and data infrastructure at NYC tech startups. I teach data engineering courses on LinkedIn Learning and O’Reilly, focused on making complex topics accessible to everyone. I also founded Bright Nights Social, an alcohol-free nightlife community that’s produced 100+ events across NYC. You’ll probably find me on a dance floor or running around Berlin this summer (training for the Berlin marathon). 📚 Resources * [Apache Spark](https://spark.apache.org/) * [PySpark](https://spark.apache.org/docs/latest/api/python/index.html) * [PySpark DataFrame API](https://spark.apache.org/docs/latest/api/python/getting_started/quickstart_df.html) ⚡️ Lightning talks We would like you to give a lightning talk (shorter than 10 minutes) about what you are doing with Python. 📍This will be a face-to-face meeting.

You were hired by Spaniard Captain de Ordaz (who's accompanied by the somewhat creepy Mother Iris) to learn about the fate of a previous expedition and recover its treasures. After getting stranded on a British controlled island, you acquired a sloop you set sail for St Martin's and have recovered both halves of the treasure map. This is an ongoing campaign but we have space for 1 or 2 folks to drop in either just for this session or perhaps for more. Diverse group, laughs over maths, beginner friendly. Check [our Discord](https://discord.gg/G89xuyCwS) for questions.

📢 WICHTIG 📢 Diesmal organisieren wir das Treffen draußen, im Tilla-Durieux-Park gegenüber The Playce in Potsdamer Platz. Wir sitzen auf dem Gras, wo der Boden flach ist. Wenn möglich bring bitte Picknickdecken mit.

Bachata (the dance of our generation) is a social couple dance like Salsa - no choreography. The community in Berlin is active daily - you will meet a lot of open-minded people and make new friends quickly! Every Thursday we have Bachata dance classes in Berlin - we are usually a group of around 20 people (95% beginners): 🕖 19:00 class: Beginners-+ Bachata Technique (0-1+ years experience) • No partner needed - we switch (for couples: partner rotation is optional). • You can start from zero in any of these classes! 📍 Adress: Jakob-Mierscheid-Steg ([Google Maps Link](https://maps.app.goo.gl/pjXopSSqAt55FQGW9)) - near S+U Hauptbahnhof We are down by the river. • Price: 12€ per class (10er-card = 100€). ✅ Dance teacher contact: [WhatsApp-group](https://chat.whatsapp.com/IWKPsid0cBDAUHCWKZNL2B) / [Instagram](https://instagram.com/mahir.bachata.berlin) 🇩🇪: Bachata (der Tanz unserer Generation) ist ein sozialer Paartanz wie Salsa - keine Choreographie. Die Bachata-Szene in Berlin ist groß und täglich aktiv - du wirst schnell viele offene Leute kennenlernen und neue Freundschaften schließen! Jeden Donnerstag findet dieser Bachata Tanzkurs statt - wir sind meistens eine Gruppe von 20+ Leuten (95% Anfänger): 🕖 19 Uhr Kurs: Anfänger-+ Bachata Technik (0-1+ Jahre Erfahrung) • Kein Partner nötig - wir wechseln (für Paare ist der Partner-Wechsel optional). • Du kannst in diesen Kursen jederzeit von null starten! 📍 Adresse: Jakob-Mierscheid-Steg ([Google Maps Link](https://maps.app.goo.gl/pjXopSSqAt55FQGW9)) - Nähe S+U Hauptbahnhof Wir sind unten am Wasser. • Preis: 12€ je Kurs (10er-Karte = 100€). ✅ Tanzlehrer Kontakt: [WhatsApp-Gruppe](https://chat.whatsapp.com/IWKPsid0cBDAUHCWKZNL2B) / [Instagram](https://instagram.com/mahir.bachata.berlin) Schreib uns gerne eine Nachricht, wenn du offene Fragen hast! Wir freuen uns auf dich ❤ Bachata Classes Berlin

We're gonna have another Game Creators Hangout! The Hangout is a place where those who create games or are interested in it meet up and talk about whatever they like. Its a place for the community, but also to connect people from different communities. It does not matter whether you're a veteran game dev, just started school or just dabble in creating games in your free time - all of you are welcome here. Accessibility: There is a small step at the entrance. Seating is available inside as well as outside. Some tables are only accessible via a few steps. For this evening, the bar is smoke free, but usually it is a smoker bar. \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-German\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- Es ist Zeit für einen Game Creators Hangout! Der Hangout ist ein Ort, an dem sich diejenigen, die Spiele machen oder daran interessiert sind, treffen und über alles sprechen, was sie möchten. Es ist ein Ort für die Community, aber es geht auch darum, Menschen aus verschiedenen Communities zu vernetzen. Es spielt keine Rolle, ob du ein\*e erfahrene Spieleentwickler\*Inn bist, gerade die Schule angefangen hast oder nur in deiner Freizeit gerne Spiele erstellst - alle sind hier willkommen. Barrierefreiheit: Am Eingang der Bar befindet sich eine kleine Stufe. Es gibt Sitzmöglichkeiten drinnen und draussen. Einige der Tische und Stühle sind nur über 2 Treppenstufen erreichbar. Die bar ist an diesem Abend rauchfrei, aber normalerweise eine Raucherbar.

We're helping spread the word about the upcoming Berlin FinOps Foundation Meetup and would love to see more of our Meetup community there. Please note: **registration is handled by the FinOps Foundation**, not through Meetup. Secure your spot here: [https://community.finops.org/event/berlin-finops-foundation-meetup-july](https://community.finops.org/event/berlin-finops-foundation-meetup-july) The event brings together FinOps practitioners, cloud cost leaders, and community members for networking and knowledge sharing. If you're interested in FinOps, cloud financial management, or connecting with peers in the Berlin area, this is a great opportunity to join the conversation. We're also excited that Henrique Amorim, who recently started as the FinOps Foundation's EMEA Community Lead, will be joining this event. Henrique is eager to connect with the community, share ideas, and discuss the future of the FinOps community across Europe. Bring your questions, feedback, and thoughts on where the community should go next. Register via the FinOps Foundation event page above and we'll see you there.

Join us for the **Berlin DevOps Summer Meetup**: our last edition before the summer break! We're excited to be hosted by **Parloa** for an evening of interesting talks, discussions, and networking. There will be food and drinks provided, and plenty of time to connect with fellow DevOps enthusiasts. **📌 Please register at least 24 hours before the event.** We need to share the attendee list with the Parloa office in advance, and **spots are limited**. \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- **Agenda** 18:30 Open Doors, Networking with Food and Drinks 19:00 Welcome words by Parloa and BLN DevOps team 19:25 **Running K8s with AI: Automating** **the SRE Lifecycle with Grafana MCP and GitLab** 19:50 **The Pipeline Was Green — AI Agents and CI Trust** 20:15 Short Break 20:30 **Managing Uninvited Guests: Securing Open Source Dependencies** 20:55 Networking 21:30 Closing ➡️ Interested in hosting an event? Fill out our [Call for Hosts](https://docs.google.com/forms/d/e/1FAIpQLScBpga8Yp-QAQt2lGskZWOThaKyQ_MbMbZaNcklgeXxqr5Vrg/viewform?usp=sf_link) and let's set up a meeting. \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- *Christoph Ebeling* **Running K8s with AI: Automating** **the SRE Lifecycle with Grafana MCP and GitLab** What does it look like to run 30+ microservices, 8 databases, and a Kafka cluster almost entirely through AI agents? This talk walks through a practical demo of automating the full SRE lifecycle: from incident investigation to deployment validation, using Grafana MCP and the GitLab Agent Platform, and where humans still need to stay in the loop. *Serhii Vasylenko* **The Pipeline Was Green — AI Agents and CI Trust** We’ve spent years building CI/CD pipelines that tell us when code is "technically correct," but are they capable of telling an autonomous AI agent if a change is safe to apply? This talk explores a real-world incident where an AI-powered automation -- pairing Renovate with Claude Code -- successfully executed a "green" pipeline that broke a critical QA cluster for three days, how the team reacted, and how we evolved our vision toward the future of human-agentic collaboration with code. *Frithjof Hoffmann* **Managing Uninvited Guests: Securing Open Source Dependencies** Open source software is the ultimate neighborhood party, but what happens when an uninvited guest slips through the door? This talk digs into the messy reality of dependency hell and its role in software supply chain security: from typosquatting attacks to maintainer account takeovers, and the abandoned projects with known CVEs quietly living in your codebase rent-free.

***Join us this summer to hike in Eifel National Park and discover Monchau and the Holy Roman town of Aachen.*** **HOW DO I JOIN THIS EVENT?** Click on link below to get complete info and to sign up for this event by getting your ticket. [https://urbanaturetravel.com/event/monschau-eifel-national-park-hiking](https://urbanaturetravel.com/event/monschau-eifel-national-park-hiking) **SPECIAL OFFER FOR NEW USERS** * 10% New User Discount using promo code: **MEETUP10** * Valid for this trip or any other trips available on our website. **WHY GO?** Fire, water, air and earth. Almost no other region in Germany is dominated by the elements as much as the Eifel uplands. The landscape reflects the geological development of millions of years in fast motion: valleys crossed by rivers, the cones of extinct volcanoes, dry maars which have become moorland, bizarre rock formations and layers of different hill ranges. The Eifel region was settled by Celts, Romans and Franconians amd the the products of their cultures are still there to be admired: romantic towns such as **Monschau also know as the "Pearl of the Eifel"**, with half-timbered houses dating from the Middle Ages, the fascinating remains of Roman structures and imposing castles such as “Burg Eltz”. The town is also surrounded by beautiful countryside and is a great base for hiking and outdoor activities. **WHAT ARE SOME OF THE HIGHLIGHTS?** * **Exploring Monschau "Pearl of the Eifel":** Charming and picturesque village with preserved half-timber houses in the Eifel mountains on the Rur River Valley. Monschau exudes with history, architecture & romance. * **Hiking in the Eifel Region:** This region was shaped by volcanic activity and although the last volcano erupted about 10,000 years ago, evidence of the Eifel’s turbulent past can be seen in the crater lakes, called maars, that pepper the Vulkaneifel landscape. The region also boasts some of the loveliest fairy tale towns and medieval castles in the country. * **Short Guided tour of Aachen:** Aachen is known for its history and culture, as well as its thermal springs and spa. The city was the preferred residence of Charlemagne, and was the place where **31 Holy Roman Emperors** were crowned Kings of the Germans. It's also famous for **Aachen Cathedral**, a **UNESCO World Heritage Site**, which was built in the 8th century and is considered one of the most important examples of Carolingian architecture. * **Aachen Cathedral:** Aachen Cathedral was the very first site to be granted **UNESCO World Heritage** status in Germany, and with good reason: built in around 790 to 800, the cathedral is of world importance in terms of the history of art and architecture, and is one of the great examples of church architecture. The final resting place of Charlemagne, it was also where German emperors were crowned for 600 years. * **Aachen Thermal Baths (Optional):** In Aachen, water and wellness have a long tradition. While in former times, the Romans relaxed in the therapeutic waters of the Aachen mineral springs, today, the Carolus Thermen thermal pools offer the perfect escape from everyday life. Perfect way to finish the day. **TRIP DETAILS** **Start & End Date:** Saturday, 4 July 2026. **Meeting Location & Time:** * **Option A:** Dusseldorf Hbf at 7:00 am on Saturday morning. * **Option B:** Meet outside Aachen Hbf at 8:30 am on Saturday morning. * **Note:** Exact meeting location will be provided in the WhatsApp group for this trip. **Finishing Location & Time:** * **Option A:** Dusseldorf Hbf at 10:00 pm. * **Option B:** Aachen Hbf at 8 pm. **Hiking Distance:** 15 km – Hiking in the Eifel uplands & exploring Monschau - "Pearl of the Eifel" & Aachen. **Hiking Difficulty:** Easy to Intermediate – Hiking at relaxed pace on well-marked paths, moderate/low elevation, no experience required. **What is Included ?** * Community Guide & Leader for the entire trip. **Note:** English is the main language spoken in the trip. * All public transportation from the meeting location to the finishing location (Based on the ticket option selected). * Short guided tour of Aachen city. * Short guided tour of Monschau "Pearl of the Eifel". * Guided hike. * Access to a Google photos album dedicated to this trip, where you can share all your amazing pics & videos. * Access to a WhatsApp group only for the confirmed participants. **Where is Aachen located?** * One hour by train from: Dusseldorf & Cologne. * Two hours by train from: Brussels. * Three hours by train from: Amsterdam. **WHAT IS THE PLAN ?** 🕖 **7:00 AM – Meet at Düsseldorf Hbf** Meet your guide and fellow participants at Düsseldorf Central Station before departing towards Aachen. 🚆 **7:15 AM – Train to Aachen** Enjoy a relaxed morning train journey through western Germany. 🏛️ **8:45 AM – Arrival in Aachen** Meet the rest of the group joining from other locations before continuing together towards Monschau. 🚌 **9:15 AM – Bus Journey to Monschau** Scenic ride through the beautiful Eifel region. 🏡 **10:20 AM – Arrival in Monschau & Start Hiking** We begin our scenic 14 km hike through picturesque forests, river trails, and rolling hills surrounding Monschau. 🌲 **12:30 PM – Forest & Riverside Trails** Follow the beautiful Rur River through peaceful woodland paths and rocky landscapes. 🥪 **1:30 PM – Lunch Break with Scenic Views** Relax and enjoy a break surrounded by the beautiful Eifel countryside. ⛰️ **2:15 PM – Hilltop Viewpoints over Monschau** Climb to panoramic viewpoints overlooking Monschau’s famous half-timbered houses and valley landscapes. 🏘️ **4:00 PM – Free Time in Monschau** Explore the charming old town, cafés, bakeries, and the famous “Venice View” of Monschau. 🚌 **5:00 PM – Bus Back to Aachen** Return journey through the scenic Eifel countryside. 🏰 **6:30 PM – Aachen City Walk** Discover one of Germany’s oldest cities, once home to Emperor Charlemagne and the coronation site of Holy Roman Emperors. ♨️ **8:00 PM – Optional Thermal Bath Visit** Relax and unwind at Aachen’s famous thermal baths or enjoy free time in the city center. 🚆 **9:00 PM – Train Back to Düsseldorf** Begin the return journey home after a full day of hiking, history, and beautiful scenery. 🕙 **10:00 PM – Arrival at Düsseldorf Hbf** End of the trip. **FOR FUTURE TRIP UPDATES** Please do join our WhatsApp / Telegram channel for updates about our future trips including possible early bird discounts, contests etc. 1. [WhatsApp Channel](https://go.unt.global/travelgroup) 2. [Telegram Channel](https://t.me/urbanaturetravel)

1 EURO DONATION FEE PER PERSON IS REQUIRED (on site, in cash), to pay back the Meetup subscription fees and support my Events. READ THE DESCRIPTION WITH THE INFO (IMPORTANT). We take a walk in Berlin to meet new people or people we already know 😁 It's a way to spend a few hours together on a Sunday afternoon. **How it works?** The concept is very simple: * We meet at Alexanderplatz Station at 14,00 o'clock (we use the Whatsapp Chat to find each other: I will post there my exact location in the station) * I wait for people for 10 minutes, till 14,10, then we start to walk direction West, crossing Museum Island and Mitte 🏛️🏘️ * We reach Tiergarten and we will cross the entire park, seeing some of its interesting points🌲🌳☘️ * We finally reach Café am Neuen See: https://maps.app.goo.gl/kSui84icxyU6hQG56 to sit down together to take something to drink or eat 🥐☕🍪 * The total length of the walk is about 8kms I consider that the event will last in overall around 4 hours (2 hours of walk and 2 hours at Café am Neuen See), but people are free to stay together longer, if they want 🙂 What I provide is leading the walk and the people at Café am Neuen See, but I do not force anyone to stay shorter or longer. I do not provide a "personal support" for people who arrive after 14,10 (do not write to me expecting "private support"). You are responsible to check for the weather and decide if come or not. Thanks for understanding. If you have to contact me, make it via Whatsapp, not here on Meetup. WHATSAPP GROUP 💬 to find each other (join it, we use this group to find and synchronize us) [https://docs.google.com/document/d/157uLVXObKt1a4NqqvPa09NJW-050YBwHLW-7DbOD8R8/](https://docs.google.com/document/d/157uLVXObKt1a4NqqvPa09NJW-050YBwHLW-7DbOD8R8/)

Join us for our second hike of the summer! We will start by meeting at (or at least boarding) the **10.40 RE2 (3112)** at **Ostkreuz** station, **Platform 1**. We will arrive at Lübben (Spreewald) at 11.25. *Note that if you miss this train, then the next one does not arrive until 11.56, so you will certainly miss us and won't be able to catch up!* The hike will go from Lübben to Schlepzig, along the canals and lakes of the beautiful Spreewald region. *(See photos for a rough route -- this is not necessarily accurate!)* The walk will be about 15 km and take about 4-5 hours. Bring lunch, snacks & water, comfortable walking shoes, and maybe even some sunglasses. We will stop a couple of places along the way, but will not stop long enough to order food, so bring your lunch! At the end of the walk, in Schlepzig, there is a Whisky brewery and a Biergarten. We will visit one or both. You can also get food at both. Then, we will take the 18:57 bus back to the starting point of Lübben Bahnhof. From there, we will catch the 19.34 RE2 (3129) back to Ostkreuz, arriving at 20.23. *(If you really want to, and if we get to Schlepzig in time, then you can also take the 16.52 bus to Lübben, then the 17.34 RE2 back to Berlin.)* **Note: We will reschedule this if the weather is too rainy. So definitely check back here before going!**

Zur Aktionswoche gegen Einsamkeit des [Kompetenznetzwerks Einsamkeit ](https://kompetenznetz-einsamkeit.de/aktionswoche)veranstalten wir von [platoniq.health](https://www.platoniq.health/de) ein kostenloses und unverbindliches Walk & Talk Format. Begleitet von kleinen wissenschaftlichen Einblicken und psychologischen Impulsen spazieren wir gemeinsam im Treptower Park und tauschen uns über das Thema Freundschaft und Einsamkeit aus. Eingeladen sind alle, die sich für das Thema soziale Beziehungen interessieren.

You can sleep in on the Sesquicentennial (observed), we’re shifting to the following Friday. But join the local UX community for a chat and some biscuits to catch up. If you were in CA for Figma Config, tell us all the lines and you can tell me how I can animate an SVG without coding it by hand, and why I’d even want to. Thanks to the team at Nationwide of supporting the group.

Most people use LLMs by feel: ask a question, read the answer, decide whether it “seems good,” and move on. That works for casual use. It does not work when you are building software, automating workflows, writing important documents, or relying on AI for anything that needs to be repeatable. In this talk, we’ll look at how to improve and evaluate the inputs and outputs of LLMs using practical measurement techniques. We’ll cover how prompt changes affect results, how to compare outputs, how to build simple evaluation sets, and how math-based methods like similarity scoring can help you move beyond guesswork. This will be beginner-friendly, so even if you don't know anything about AI, you should get something out of it. However, this will be a little more technical than our intro talks. You do not need to be an AI researcher, but programmers and technically curious attendees will get a lot out of it. We’ll cover: * Why “it looks good” is not enough * How to improve prompts by changing the input, context, and constraints * How to compare LLM outputs more systematically * Basic evaluation techniques for accuracy, consistency, and usefulness * How embeddings, cosine similarity, and scoring can help evaluate results * Where automated evaluation works — and where humans still need to stay in the loop By the end, you’ll have a practical mental model for treating LLMs less like magic and more like systems you can test, measure, and improve. LOGISTICS AND PARKING: The talk starts at 7:00 PM. The first half hour is reserved for everyone to get set up and mingle. Free pizza and drinks! The cheapest parking option is to find street parking, which will only cost you a few bucks. Otherwise, park in the nearby veteran's museum lot for $8. It's highly recommended you avoid the nearby $15 garage parking.

We have moved to guild.host. Look us up there. https://guild.host/events/buckeye-cocoaheads-rcavwd

Let’s meet and discuss John Updike's Rabbit, Run, the first in his series of four novels following the life, hopes, and disappointments of former local basketball star, Harry "Rabbit" Angstrom, as he fitfully confronts and evades adulthood.