Ecommerce Meetups Berlin
Connect with Berlin's Ecommerce Professionals

E-Commerce over Breakfast Berlin
Fri, Sep 4, 7:00 AMA curated meetup for e-commerce operators to share learnings, strategies, and ideas. Free for e-commerce operators (approval required). Apply via Luma: [https://luma.com/r4ipii5m](https://luma.com/r4ipii5m) Exact location will be shared after approval.

PyData Berlin 2026 August Meetup
Wed, Aug 19, 4:00 PMWelcome to the PyData Berlin August meetup! We would like to welcome you all starting from 18:00. There will be food and drinks. The talks begin around 18.30 and the doors will close at 18:45. **Make sure to arrive on time!** Please provide your first and last name for the registration because this is required for the venue's entry policy. If you cannot attend, please cancel your spot so others are able to join as the space is limited. **Host**: **GetYourGuide** is excited to welcome you to this month's version of PyData. \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* The Lineup for the evening **Talk 1: From Discovery To Transaction: Personalizing Marketplaces with Intent-Aware Ranking** **Abstract**: In the world of online marketplaces, growth can be a double-edged sword: with a larger supply and user base, making the “perfect match” becomes harder to achieve. For GetYourGuide—a global online marketplace for travel experiences—this meant a single, static experience no longer worked equally well for a diverse global audience. To move past this “one-size-fits-all” limit, we shifted from treating users as one monolithic group to predicting intent in real time. By analyzing user behavior, we found two common planning modes. Discovery users are exploring what’s possible in a destination. Transaction users return with a clearer goal and are closer to booking. In this talk, we’ll explain how we built a segmentation framework and a production service that updates these segments in real time using machine learning. We’ll show how these user segments feed into our activity ranking models to personalize results and improve relevance across the search journey. We’ll close with measured impact on engagement and conversion, and what this approach can unlock for other marketplaces moving beyond static user experiences **Speaker**: Kaan Isik and Mihail Douhaniaris **Bio**: * Kaan Isik is a Senior Data Scientist at GetYourGuide where he works on the Activity Ranking team. As a member of this team, he focuses on developing and optimizing the learn-to-rank deep learning model that powers real-time activity recommendations for millions of travelers worldwide. His work directly impacts how users discover activities across GetYourGuide's platform, making their travel planning more personalized and efficient. * Mihail Douhaniaris is a Senior Data Scientist at GetYourGuide, where he specializes in marketplace search & ranking algorithms to improve search relevance. His work helps travelers find experiences that match their preferences more effectively. Beyond his role, Mihail is interested in responsible AI, ML observability, and the challenges of deploying machine learning at scale. **Talk 2: Speeding up PyFixest's fixed effects demeaning with new algorithms and Rust** **Abstract**: Fixed effects regressions are ubiquitous in applied data science: they are employed for difference in difference models, switchback designs, variance reduction... Based on the structure of fixed effects, the standard approach to fit fixed effects models at scale can become very inefficient. Therefore, we have developed a new strategy that works extremely well when the default solver struggles. In the talk, I will introduce fixed effects modeling, how it is usually implemented computationally, explain intuitively when/why the default solution can be slow, and introduce our new strategy that is implemented in the rust crate "within" and can be called from Python and R and is already available via the pyfixest regression library. **Speaker**: Alexander Fischer **Bio**: During the day, Alexander works as a data science lead on auction and experimentation topics at trivago. During the night and weekend, he works on open source. Most of his time goes into a package for linear regression - pyfixest - for which, around 4 years ago, we had the stated goal to “make fixed effects regression in Python as nice as in R” before the agents would start writing all of the code. Looking back, we almost succeeded! =) **Lightning talks** There will be slots for 2-3 Lightning Talks (3-5 Minutes for each) between the two main talks. Kindly let us know if you would like to present something :) \*\*\* NumFOCUS **Code of Conduct** THE SHORT VERSION Be kind to others. Do not insult or put down others. Behave professionally. Remember that harassment and sexist, racist, or exclusionary jokes are not appropriate for NumFOCUS. All communication should be appropriate for a professional audience including people of many different backgrounds. Sexual language and imagery are not appropriate. NumFOCUS is dedicated to providing a harassment-free community for everyone, regardless of gender, sexual orientation, gender identity, and expression, disability, physical appearance, body size, race, or religion. We do not tolerate harassment of community members in any form. Thank you for helping make this a welcoming, friendly community for all. If you haven't yet, please read the detailed version here: https://numfocus.org/code-of-conduct \*\*\*

🌞 Einladung zum Sommerfest 2026 🌞
Sat, Aug 22, 1:00 PM🍊🥑😎 Liebe Freund\*innen, Unterstützer\*innen und Kooperationspartner\*innen, wir laden herzlich ein zu unserem diesjährigen Sommerfest bei Über den Tellerrand. 🗓️ Wann: Samstag, 22. August 2026, ab 15 Uhr bis ca. 19 Uhr 🌳 Wo: Open Air im Cherusker-Park (bei schlechtem Wetter drinnen bei „Über den Tellerrand" in der Roßbachstr. 6) Lasst uns zusammenkommen, den Sommer und unsere Community zu feiern – mit leckerem Essen, guten Gesprächen und für neue Verabredungen! 🍽️ Vegetarisches Mitbring-Buffet Wir freuen uns sehr, wenn ihr für unser Picknick einen Beitrag mitbringt. 🔥 Flammkuchen-Aktion Zusätzlich zum Buffet machen wir gemeinsam vegetarische Flammkuchen – Teig kneten, belegen, backen und natürlich zusammen genießen. Für alle, die Lust haben, gibt es: 🎨 Kreide-Malfläche – zum kreativen Austoben 🏓 Spiele – Tischtennis, Bälle & Schläger sind da 🎶 Wer mag, bringt ein Instrument mit – Live-Musik ist immer willkommen! Ausklang: Gegen 18 Uhr räumen wir wie immer gemeinsam auf und lassen das Fest gemütlich ausklingen. Ende ca. 19 Uhr. Für unsere Planung meldet euch gern hier an: [https://bit.ly/4hkgqSn](https://bit.ly/4hkgqSn)  Wir freuen uns auf einen schönen gemeinsamen Nachmittag mit euch! ☀️ Euer Team von Über den Tellerrand e.V.

OpenSpace Networthing Workshop
Sat, Aug 22, 1:00 PM**meet, share and co-create** every month with interesting **entrepreneurs** from diverse backgrounds at our **OpenSpace Networthing Workshops**. **Bring food**, a **slide** or two of your project or anything you want to share with the community. 1. **Boarding time**: 15:00-15:30, where we ask these questions like: What is one meaningful goal you would like to achieve with the help of the FirstFriday Community and why is it important to you? 2. **Intro-Round**: tell your name, what you do, what you bring into the community and what the community can do for you to bridge the gap. 3. **Pause** to eat the food and network 4. **Workshop** with **Milap Singh**, where we learn, build, co-create and deploy together a meaningful community project based on the needs of our community. 5\. Finish the food and drinks

Toastmasters Public Speaking - Practice effective Communication
Tue, Aug 25, 4:50 PM🎤 **What Happens at a Toastmasters Meeting?** We change the time to 7pm please aarive 10 minutes earlier. Curious about Toastmasters? Come experience it for yourself! At **Toastmasters Center Berlin**, our meetings are designed to help you grow as a speaker, listener, and leader — in a fun, supportive environment. Here’s what you can expect: ✅ **Warm Welcome** – Guests are always greeted with open arms. No pressure to speak — just observe and enjoy! ✅ **Prepared Speeches** – Members deliver inspiring, informative, or entertaining speeches they've crafted. ✅ **Impromptu Speaking (Table Topics)** – A fun challenge where volunteers speak on surprise topics for 1–2 minutes. Great for thinking on your feet! ✅ **Constructive Feedback** – Every speaker receives thoughtful evaluations to help them improve. ✅ **Leadership & Roles** – Members take on meeting roles that build confidence and leadership skills. Whether you're looking to overcome stage fright, sharpen your storytelling, or simply meet like-minded people — this is the place to start. 🗓️ **Join us as a guest — no experience needed!** 📍 **Toastmasters Center Berlin** 💬 **Grow your voice. Share your story.**

Börse, Investment und Trading Stammtisch
Sun, Aug 23, 3:00 PMMeinungsaustausch, Investmentideen, Buchbesprechungen, Charttechnik, Fundamentalanalyse. Wir diskutieren über die Themen Börse, Investment und Trading. Verkehrssprache ist deutsch. Egal ob Anfänger, Profi oder "will nur mal gucken": jeder ist willkommen und kann mitreden. Ablauf: Es gibt eine Diskussion zur Einschätzung der aktuellen Marktlage (Schwerpunkt USA) unter Erläuterung der geeigneten Indikatoren und ich zeige, wie ich eine konkrete Aktie im letzten Monat gehandelt habe inklusive der dazu verwendeten Handelsregeln (\*\*\*keine Anlageberatung, nur Veranschaulichung zu Bildungszwecken\*\*\*). Die Veranstaltung ist insbesondere geeignet für aktive Händler in Einzelaktien, Optionen und Rohstoffen. Es geht viel um technische Analyse und technische Markteinschätzung, aber auch um fundamentalanalytisch basierte Einzelaktienauswahl, Volatilitätshandel und Optionshandel. Es gibt ein Musterdepot, dessen Struktur und Performance als Diskussionsgrundlage dienen soll. Jeder kann seine Meinung dazu äußern. Das Musterdepot findest Du bei wikifolio.com unter https://www.wikifolio.com/de/de/w/wf000bit01 Meinen Youtube-Kanal findest Du hier: https://www.youtube.com/channel/UCCmOeA2-rAS2P8YZNp11N6Q Kryptowährungen spielen thematisch nur eine untergeordnete Rolle. Der Kurzvortrag mit Diskussion startet pünktlich 17.15 Uhr. Wer viel Aufmerksamkeit braucht, kommt einfach zu spät und wird von allen angeschaut :-) Wer noch Kontakte knüpfen oder quatschen möchte, sollte schon ca. 16.30 Uhr kommen. Die Veranstaltung endet ca. 19 Uhr. Die Veranstaltung findet in einem öffentlichen Café statt.
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