Sierra Club

Jesteś pasjonatem radia, elektroniki, lub ciekawią Cię tajniki łączności ? Dołącz do naszego hackerspace, gdzie odkryjemy fascynujący świat krótkofalarstwa! Niezależnie od tego, czy jesteś doświadczonym radioamatorem, czy dopiero zaczynasz swoją przygodę. Przyjdź, posłuchaj, dowiedz się, jak działają anteny, odbiorniki, i nadajniki. Łączymy pasję do techniki z duchem DIY – stwórz z nami coś niezwykłego! Are you passionate about radio, electronics, or intrigued by the mysteries of communication? Join our hackerspace and discover the fascinating world of ham radio! Whether you're an experienced radio amateur or just starting your journey, come along to listen, learn how antennas, receivers, and transmitters work, and dive into the technical side of things. We combine a passion for technology with the DIY spirit—create something extraordinary with us!

Zapraszamy wszystkich zainteresowanych muzyką i syntezatorami na codwutygodniowy jam session w naszym spejsie. Umiejętności muzyczne nie wymagane! Mile widziane przyniesienie własnego sprzętu, ale jak nie masz, to też znajdziejsz coś do robienia (będzie dobrze). Jeżeli masz problem z wejściem, zadzwoń domofonem przy bramie od ulicy na nr 100, zadzwoń telefonem na 42-203-20-50 albo wejdź na naszego chata (patrz poniżej). Potrzebujesz więcej informacji? Skontaktuj się z nami na czacie lub mailowo. Szczegóły znajdziesz tutaj: [https://lodz.hackerspace.pl/](https://lodz.hackerspace.pl/) Więcej szczegółów uzgodnimy na naszym chacie Telegramowym/Matrixowym: [https://t.me/hakierspejs](https://t.me/hakierspejs) [https://matrix.to/#/%23hs-ldz:hackerspace.pl](https://matrix.to/#/%23hs-ldz:hackerspace.pl)

Hakierspejs spotyka się na żywo w siedzibie stowarzyszenia! Zapraszamy wszystkich zainteresowanych naszą aktywnością. Uczestnictwo jest darmowe, rejestracja nie jest obowiązkowa – wystarczy po prostu przyjść. Nie mamy żadnego konkretnego planu: po prostu zbieramy się i haczymy - co komu przyjdzie do głowy. Zaczynamy o 19:00, ale warto sprawdzić [https://at.hs-ldz.pl](https://at.hs-ldz.pl) – być może ktoś otworzy siedzibę wcześniej. Jeżeli masz problem z wejściem, zadzwoń domofonem przy bramie od ulicy na nr 100, zadzwoń telefonem na 42-203-20-50 albo wejdź na naszego chata (patrz poniżej). Potrzebujesz więcej informacji? Skontaktuj się z nami na czacie lub mailowo. Szczegóły znajdziesz tutaj: [https://lodz.hackerspace.pl/](https://lodz.hackerspace.pl/) Więcej szczegółów uzgodnimy na naszym chacie Telegramowym/Matrixowym: [https://t.me/hakierspejs](https://t.me/hakierspejs) [https://matrix.to/#/%23hs-ldz:hackerspace.pl](https://matrix.to/#/%23hs-ldz:hackerspace.pl)

Spotkania z serii wymiany wiedzy podczas wspólnego rozwiązywania zadań CTF – jest to świetna zabawa pozwalająca równocześnie rozwinąć wiedzę w zakresie cyberbezpieczeństwa. Poziom trudności CTF-owego zadania ustalimy na początku spotkania. Najprawdopodobniej wybierzemy coś z platformy Hack The Box. Spotykamy się **co tydzień w środę o 19:00.** \-\-\- Zaczynamy o 19:00, ale warto sprawdzić https://at.hs-ldz.pl – być może ktoś otworzy siedzibę wcześniej. Jeżeli masz problem z wejściem, zadzwoń na 42-203-20-50 albo wejdź na naszego chata (patrz poniżej). Potrzebujesz więcej informacji? Skontaktuj się z nami na czacie lub mailowo. Szczegóły znajdziesz tutaj: https://lodz.hackerspace.pl/ Więcej szczegółów uzgodnimy na naszym chacie Telegramowym: https://t.me/hakierspejs

[English version below] Cześć, Mam ogromną przyjemność zaprosić Was na pierwsze spotkanie organizowane wspólnie z łódzkim oddziałem **EPAM**. W planach dwie prezetacje odnośnie AI: **Java RAG: Build Your Own Black Box** oraz **Spring AI**. **Ważna uwaga: spotkanie wyjątkowo zaczyna się o 17:30!** Hi, I’m very happy to invite you to our first meetup, which is being organized in collaboration with the Łódź branch of EPAM. We have two AI-related talks planned: **Java RAG: Build Your Own Black Box** and **Spring AI**. **Important note:** this meetup will **start at 17:30**. **Spring AI** Transforming your existing Java applications into intelligent, AI-driven systems no longer requires a PhD in Data Science or switching to Python. In this session, we explore how Spring AI brings the familiar power of the Spring ecosystem - portability, modularity, and POJO-based design - directly into the world of Artificial Intelligence. We’ll move beyond basic API calls to show how you can harness Large Language Models (LLMs) like OpenAI and Google Gemini using the same @Service and dependency injection patterns you use every day. We will provide an overview of the major capabilities and also dive into the latest Spring AI v2 milestones that position Java at the forefront of the agentic AI wave. By the end of this talk, you’ll see how Spring AI acts as a bridge that allows Java developers to build production-ready, intelligent features without reinventing the wheel. **Dzmitry Sidarenka** Dzmitry has nearly 20 years of experience specializing in systems built with Java. He is passionate about building and testing robust APIs and is known for thriving in high-pressure production incident troubleshooting. His work focuses on designing reliable, maintainable services and improving system resilience through pragmatic engineering practices. **Java RAG: Build Your Own Black Box** Retrieval-Augmented Generation (RAG) often feels like a magical black box. But once you start experimenting with it yourself, it quickly becomes clear how powerful the combination of information retrieval and generative AI can be. Key topics: \- What is Retrieval\-Augmented Generation \(RAG\)? \- Why should you consider using it in your own projects? \- Key RAG components and how the workflow operates \- How to build your own RAG solution using Java \- Live demo of a Java\-based RAG project and ways to extend and improve it **Ahmed Samy** Ahmed is a Senior Software Engineer at EPAM Systems. As he jokes, he often feels like a junior at work - mostly thanks to his constant curiosity and desire to keep learning new things. In his daily work, he actively uses AI as a learning companion, exploring new ideas by experimenting, testing different approaches, and working with various pieces of code. **About the partner** EPAM is a global leader in AI transformation engineering and integrated consulting, serving Forbes Global 2000 companies and ambitious startups. With over thirty years of expertise in custom software, product and platform engineering, EPAM empowers organizations to become AI-native enterprises, driving measurable value from innovation and digital investments. Learn more at our local [Facebook](https://www.facebook.com/EPAM.Poland/) page and [Instagram](https://www.instagram.com/epam.poland/?hl=en) profile. **Disclaimer for the meetup registration** By registering, I consent to photos taken during the Java User Group Meetup in Łódź on March 31, 2026 being used for promotional purposes by Java User Group Łódź and EPAM Poland.

⚠️ **ZAPISY W OSOBNYM FORMULARZU:** [https://sii.pl/wydarzenia/aws-user-group-lodz/](https://sii.pl/wydarzenia/aws-user-group-lodz/) Wspólnie z naszym partnerem firmą SII zapraszamy na kolejne stacjonarne spotkanie AWS User Group Łódź. Tym razem będzie to spotkanie podsumowujące nowości z ostatniej edycji re:Invent. **AGENDA** 18:00 - 18:15 - Powitanie 18:15 - 18:45 - **AWS re:Invent re:Cap part I** 18:45 - 19:15 - Networking i pizza & napoje 19:15 - 19:45 - **AWS re:Invent re:Cap part II** 19:45 - 20:00 - Zakończenie **PODSUMOWANIE** **Link do rejestracji**: [https://sii.pl/wydarzenia/aws-user-group-lodz/](https://sii.pl/wydarzenia/aws-user-group-lodz/) Kiedy: 31.03 godz. 18:00 Gdzie: ul. Piotrkowska 157A, biurowiec Hi Piotrkowska DO ZOBACZENIA!

Jesteś pasjonatem radia, elektroniki, lub ciekawią Cię tajniki łączności ? Dołącz do naszego hackerspace, gdzie odkryjemy fascynujący świat krótkofalarstwa! Niezależnie od tego, czy jesteś doświadczonym radioamatorem, czy dopiero zaczynasz swoją przygodę. Przyjdź, posłuchaj, dowiedz się, jak działają anteny, odbiorniki, i nadajniki. Łączymy pasję do techniki z duchem DIY – stwórz z nami coś niezwykłego! Are you passionate about radio, electronics, or intrigued by the mysteries of communication? Join our hackerspace and discover the fascinating world of ham radio! Whether you're an experienced radio amateur or just starting your journey, come along to listen, learn how antennas, receivers, and transmitters work, and dive into the technical side of things. We combine a passion for technology with the DIY spirit—create something extraordinary with us!

## Beads: Go Open Source Projects in the Age of AI Hello, 世界! For meetup #58 on Tuesday [Mar 31, 2026 19:00 CET](https://www.meetup.com/leipzig-golang/events/312537698/) we are happy to have [Akim Zmerli](https://www.linkedin.com/in/akimzmerli/) give us an intro to [beads](https://github.com/steveyegge/beads), specifically: > How agents perform long-running tasks and pass context seamlessly to each other. [Beads](https://github.com/steveyegge/beads) is a rising Go project that brings structured planning to any workflow, whether agentic or hands-on. [Akim Zmerli](https://www.linkedin.com/in/akimzmerli/) will present his favorite techniques, TUI projects and what Rob Pike thinks about the current state of affairs. The beads project is less than six months old (2025-10-11), but already well beyond 250 KLOC, with more than 200 KLOC written in Go. We are always interested in developer tools. At [#44](https://golangleipzig.space/posts/meetup-44-wrapup/), less than two years ago, not a single AI coding tool did make it to [our list](https://golangleipzig.space/posts/meetup-44-wrapup/). Looking forward to this foray into the agentic coding space. ### Schedule * 18:45 Doors open * 19:00 Welcome * 19:10 Beads * 19:45 Open discussion We’ll meet: * in person at [Basislager Leipzig](https://basislager.co), at [Peterssteinweg 14, 04107 Leipzig](https://maps.app.goo.gl/1fMkeDSPZ7Aauszh8) ([OSM](https://www.openstreetmap.org/node/3504864558)) * and online via [Jitsi](https://meet.jit.si/LeipzigGophers58) Join us to discuss SOTA dev tools and more. Learn more at [https://golangleipzig.space/posts/meetup-58-invitation/](https://golangleipzig.space/posts/meetup-58-invitation/) and [https://golangleipzig.space/](https://golangleipzig.space/)

This Month's Book: *On A Sunbeam* by Tillie Walden Join us for discussion at the Granville Public Library from 6 to 7pm. Follow us on Instagram: @granvillepridebookclub

The Humanist Monthly Program is our longest running event and still a community favorite. In the old days it used to be called "Going to HCCO" and we still like to think of it as our flagship event. We will be hearing from Becca Powell, Director of Advocacy and Outreach at Unchained At Last, an organization whose mission is dedication to ending forced and child marriage in the United States through direct services and systems change. Unchained At Last's mission clearly meshes and addresses several of our Humanist Ten Commitments. Becca will educate us about an issue many of us may not be familiar with--but should be. Food and drinks will be provided at the event. Feel free to show up a little bit early to hang out and talk. Going forward our meetings will be hybrid. You can meet us in-person or attend online Join Zoom Meeting [https://us02web.zoom.us/j/87836564953?pwd=4Mi57ElZkDIFlb1fnlNwOJ0NiOK4tP.1](https://us02web.zoom.us/j/87836564953?pwd=4Mi57ElZkDIFlb1fnlNwOJ0NiOK4tP.1) Meeting ID: 878 3656 4953 Passcode: 760812 One tap mobile +19292056099,,87836564953#,,,,\*760812# US (New York) +13017158592,,87836564953#,,,,\*760812# US (Washington DC) The formal presentation will start at noon

**Our April novel is: *The Hong Kong Widow* by Kristen Loesch** **This month’s novel blends gothic atmosphere with historical fiction and chilling horror, set against the haunting backdrop of China. The book is 368 pages in print and 10 hours and 42 minutes on audiobook.** In 1950s Hong Kong, Mei is a young refugee of the Chinese Communist revolution struggling to put her past in Shanghai behind her. When she receives a shocking invitation—to take part in a competition in one of the city's most notorious haunted houses, pitting six spirit mediums against one another in a series of six séances over six nights, until a single winner emerges—she has every reason to refuse. Except that the hostess, a former Shanghainese silent film star, is none other than the wife of the man who once destroyed Mei’s entire life. It is promised the winner will receive a fortune, but there is only one prize Mei wants: revenge. Decades later, the final night of that competition has become an infamous urban legend: The police were called to the scene of a brutal massacre but found no evidence, dismissing it as a collective hallucination. Mei knows what she saw, but now someone else is convinced they know what she did. She must uncover the truth about the last night she ever spent in that house—even if the ghosts of her past are waiting for her there. . . .

We meet at lunch each week and each meeting follows a fairly organized agenda. First all participants pass their business cards around. Then each member and guest is invited to give a one-minute overview of their company and what is a perfect referral for the week. We always have a 10 minute presentation from one of the members about their business in more detail. And finally we pass referrals. You're welcome to visit. Nobody is ever put on the spot. Bring plenty of cards!

* Second ever book club! April meet up. All are welcome. * The book will be Play Nice by Rachel Harrison (determined by votes from March Book Club. Let me know if you’d like a free digital copy of the book) * This event will be at the main library, meeting room 1B, the location will not be changed for this event due to the number of people attending, we will just add more chairs if needed! * Feel free to come whether or not you’ve started or finished the book ◡̈ * Small snacks will be provided. You’re welcome to bring your own snacks & drinks too! Starting in June I will try to keep future book clubs at the Dublin Library. Now that I understand their reservation system, I will be on top of it with booking that location as soon as the date is released for the month. Thanks for your understanding with the varying locations in the meantime.