Concurrent Programming

Bitcoin Knots a podobné implementace se snaží vynucovat content policy na úrovni mempoolu a odmítají transakce považované za nežádoucí (označované za spam). Lukáš, náš expert na Rust a bitcoin, vám osvětlí tento problém v teorii i v praxi. **🦀 18:00 - 19:00: PREZENTACE** Tato přednáška vysvětluje, proč je filtrování transakcí na základě obsahu neúčinné v jakékoli vrstvě bitcoinového protokolového stacku. Představí dva vzájemně se doplňující argumenty. 1. Z pohledu topologie sítě: v gossip síti, kde i malá menšina uzlů zůstává permisivní, transakce s vysokou pravděpodobností obejdou filtrované uzly. 2. Z pohledu informační teorie: každý protokol, který je dostatečně expresivní, aby byl užitečný, nutně umožňuje steganografické kódování. Prostor platných transakcí je natolik velký, že do něj lze vložit libovolná data způsobem nerozlišitelným od běžné ekonomické aktivity. Filtrování na základě obsahu tak čelí protivníkovi s větším počtem stupňů volnosti než má samotný filtr. **🦀 19:00 - 19:30: LIVE DEMO + Q&A** Součástí prezentace bude živá ukázka agresivního relay uzlu napsaného v Rustu, běžícího na mainnetu, která v reálném čase ukáže tok transakcí napříč různými implementacemi uzlů. **🦀 19:30** **\- 22:00: NETWORKING** Po přibližně 60minutové prezentaci a Q&A zůstáváme na networking u piva, zhruba do 22:00. * **Vstup s registrací zdarma.** * **Pivo zdarma** pro prvních 50 hostů. * **Odměny** za nejlepší otázky. * **Knihy** od Braiins **zdarma**. **🦀 PŘEDNÁŠEJÍCÍ** Lukáš Hozda je expert na Rust, autor knihy Building Bitcoin in Rust a lektor Rust kurzů na Univerzitě Karlově. Přes den pracuje v pražské bitcoinové softwarové společnosti Braiins, kde jeho oficiální pracovní titul zní Braiins Superman. * Stáhněte si jeho eBook [Building Bitcoin in Rust zdarma](https://braiins.com/books/building-bitcoin-in-rust). * Sledujte Lukáše na X: [https://x.com/LukasHozda](https://x.com/LukasHozda) Pokud vás zajímá seriózní Rust engineering, přidejte se k nám. 🔗 https://braiins.com

Ahoj Péhapkáři! Zveme vás na další sraz komunity. 17:30 – open doors 18:00 – přednášky 20:00 - kvíz & networking Program: 🎤 David Chodúr - Využijte "skills" s AI agenty pro PHP 🎤 Jirka Pudil - Novinky v PHP 8.5 🎤 Milan Šulc - AI v OSS: Jak jsem naboostoval vývoj oss knihoven s AI tooly \-\-\-\- Děkujeme našim partnerům a těšíme se na viděnou! Adresa: Alma Career - Dock in Five, Menclova 2538/2, Libeň \-\-\-

**⚠️** You must register for the event on [Luma](https://luma.com/6lta7zul?utm_source=meetup) **⚠️** **Come have a cozy chat about Kotlin!** ​​ ​​Join us for a casual evening of conversation with fellow Kotlin enthusiasts. ​​ ​​**What to expect:** A relaxed atmosphere where you can share your use cases and real-life scenarios, or learn what others are working on. No presentations, no formal agenda—just great conversations. ​​ ​​**Who's invited:** All Kotlin enthusiasts! Any experience level, any use case, any background. ​​ *Hosted by Yasan Ghaffarian (Senior Mobile Engineer)*

We’re excited to share that after a break, **Outreach meetups are back!** 🎉 This time, we’re returning with a session focused on **engineering leadership**! This event is designed to inspire engineers and managers who want to unlock their full leadership potential without burning out along the way. Whether you’re considering a move into management, are new in the role, or already leading teams at scale, this meetup will offer **practical insights, real stories, and actionable takeaways** from experienced engineering leaders. *** ## 🗓 Talks Schedule 🕕 **17:30 – Doors open** 🎙 **18:00 – Talk 1** **Christian Galatolo, Engineering Director @ Outreach** **How Senior Engineering Managers Scale Without Burning Out** Early in my management career, I unknowingly relied on principles to build a successful new business unit. Years later, with more experience and higher stakes, I learned which principles truly scale and which mistakes quietly turn managers into bottlenecks. This talk shares those lessons, grounded in real successes, real failures, and real pressure. 🎙 **18:40 – Talk 2** **Michael Ruml, Director of Product Engineering @ Mews** **From Surviving to Scaling: Lessons from the First Year of Engineering Management** The transition from engineer to manager is one of the toughest shifts in tech. In this talk, Michael reflects on his first year as an Engineering Manager, unpacking the common traps, hard lessons, and mindset changes that make the difference between burnout and growth. A must-see for anyone navigating—or considering—the move into leadership. 🍺 **19:30 – Networking** After the talks, stick around for networking, discussions, and getting to know fellow engineers and leaders. Outreach will provide **delicious snacks and drinks**, so you definitely won’t go hungry😉 🚀**22:00 – The End** We’re really looking forward to seeing you there! 🚀 \-\-\- *By taking part in this event, you grant the event organizers full rights to the use of images resulting from the photography/video filming, and any reproductions or adaptations of the images for fundraising, publicity, or other purposes. This might include (but is not limited to): the right to use them in printed and online publicity, social media, and press releases.* *If you don’t wish to be photographed, please inform us when you arrive.*

**IMPORTANT! Please register on Luma page:** https://luma.com/h71ibm12 ​Join the **Prague Bingo Networking** meetup! ​We’re getting Creative and Tech folks together to network the honest way, through shared, painfully familiar work truths. ​**What is it?** Think of it as an *Anti-Icebreaker Game*. No awkward small talk. No forced networking. ​We’ve collected the thoughts everyone has at work (but never says out loud) and turned them into a fast, interactive **Bingo game**. ​**What we will do:** No laptops. No presentations. ​Just people, music, drinks, and Bingo cards full of “too real” work-life confessions. ​You’ll mark off squares, laugh, cringe, and inevitably say: *“Yep. Same.”* ​**Who is this for?** Creative and Tech Folks who want to meet peers, swap knowing looks, and realize they’re not alone in this industry. ​❗If your plans change after registering, please cancel your spot, it helps someone else join. ​**When & where** 📅 26.02.26 🕛 18:00 - 20:00 Prague Time (CET) 📍 VNITROBLOCK Tusarova 31, 170 00 Praha 7 ​ 🗣 Language: English ​Please arrive 5–10 minutes early to grab a drink and settle in before we start (so we can kick off on time). ​**Agenda** Welcome & rules Bingo rounds Networking & chaos Wrap-up ​See you at **Prague Bingo Networking** 🎉

**Here's the Deal** ​We all know the feeling of being stuck or hunting for fresh inspiration. Sometimes a quick scroll helps. More often, it’s honest feedback that moves things forward. ​That’s why STRV and Framer are teaming up for a portfolio night at our Prague office — centered around 1:1 conversations between our designers and you. ​Whether you’re a junior polishing your first case study or a seasoned designer looking to exchange ideas, you’re welcome. Bring your portfolio in any form and sit down with our team for focused, thoughtful feedback. 🎟 Tickets are now available on **[Luma](https://luma.com/STRVMeetups)** \- free entry\, but spots are limited\! Join us and 👉 **[Grab yours here](https://luma.com/DSGN_portfolio_night?utm_source=Meetup).** **Why Come?** * Get honest feedback * Learn something useful * Get inspired * Enjoy solid talks, great people and a beer or two **See you there. Bring a friend.**

Another Prague ServiceNow Developer Meetup is here! **What Is It About?** * Meet ServiceNow community, swap war stories, and reconnect with old teammates. * Talks with zero sales pitches — pure tech. * Food, drinks and ServiceNow SWAG on us! **What to Expect** * Presentations on technical topics * Networking, discusions * Drinks and activities designed to spark fun and connection * A chance to get exclusive ServiceNow SWAG and prizes **Agenda** \- 17:00 Doors open and drinks are served\, networking can begin \- 17:30 Welcome from organisers and sponsor \- 17:45 "AI Control Tower implementation stories" presentation by Dhruv Gupta \- 18:15 Networking with drinks \- 18:30 Fireside discussion with Dhruv Gupta on topic of ServiceNow ecosystem \- 19:00 Networking with drinks \- 20:00 Closing of the event **Why You Should Attend?** * Free entry, great content * Swag, prizes, and great company * Real, practical insights from across the ServiceNow ecosystem * Open to everyone — developers, admins, architects, analysts, and the ServiceNow-curious **Special Thanks** Big thanks to **[GuideVision](http://www.guidevision.eu/)** for providing the venue and refreshment! Another round of applause goes to our speaker: Dhruv Gupta **Save Your Spot** Places are limited — register now to secure your place. If you have any dietary requirements or food allergies, please let us know when you register.

Hi All, Come and join the yearly tradition of the pancake run! We will meet at Metro station Malostranska (outside, next to Euro Hotdog), and from there run along the river, through Vysehrad and will end up in Vrsovice, close to tram stop Kubanske Namesti. There will be coffee and pancakes for all who arrive. The run will be around 10 km, with two uphill parts.

Been putting something off for too long? Join us for our **Bi-Weekly** **Co-Working Session** in creative driven **Safe Space Bookstore** — and let’s finally get it done, together. 📲 **Want reminders or to connect with others before/after?** Join our [WhatsApp group](https://chat.whatsapp.com/K6LidaoQhe16wZ0Se9pNM6), Keep contact via [Instagram](https://www.instagram.com/nocrastinationclub/) This is a soft, safe, supportive in-person space to move through procrastination with presence and companionship. Whether you’re working on admin tasks, tax return, writing, creative projects, or simply clearing your inbox — bring whatever you’ve been avoiding and we’ll gently focus beside you. 🕐 **Time**: 3:00 PM – 6:00 PM 📍 **Location**: Jaz in the City – Ground Floor Lounge: Windmühlgasse 28, 1060 Vienna, Austria 💻 **Bring**: Your laptop, journal, creative tools, or anything you’ve been procrastinating on 🌿 **Hosted by**: NoCrastination. ☕ Please do order something from the bar, so as to keep us in their good graces! Donations optional. **🪑Seating information:** * If this is your first time joining us, please look for **Fernando Goncalves** when you arrive * If you’d like to **work independently (without the Pomodoro arrangement)** but still be part of the group energy, just let Fernando know — we’ll make sure you’re comfortably included. 💛 🌱 **What to Expect** * **Drop in anytime** between **3:00–6:00 PM** — stay for a bit or settle in for the whole session * **Clarify your goals**: write down your measurable tasks for the day on a Post-it when you arrive * **Two spaces**: one for quiet focus, one for casual conversation. After each focus session, if you’re still in the flow, feel free to remain seated — no need to move. If you're up for a chat, join others in the social area for a relaxed break. * **Social start**: from **3:00 to 3:30 PM**, we mingle and get to know each other; our first focus session begins at **3:30 PM** * **Gentle structure**: we begin with a soft check-in and intention round * **Pomodoro-style rhythm**: We work in 45-minute focus blocks followed by 15-minute social breaks. If 45 minutes feels too long, feel free to break it into two 20-minute focus sessions with a short 5-minute reset in between. You’ll need to self-regulate these shorter cycles, just tune into your own flow and rejoin when ready. * **Quiet companionship**: no pressure to talk during focus time — just shared presence and support * **Welcoming space**: we meet in the creative, cozy lobby of the **Safe Space Bookstore** 💡 **New to Pomodoro?** Don’t worry — we’ll guide you gently. No apps or timers needed. 💬 Why Join? * Beat procrastination with gentle accountability * Reclaim your momentum without doing it alone * Enjoy a change of scenery that boosts your focus * Be part of a community that shows up — without hustle Bring your project. Bring your presence. Let’s work side-by-side. 💚

Hello, we are starting SU&W at Scouts Institute this Sunday! Please find us at a table across from the cafe. The event starts at 12, and the writing starts at 12:15! We will have 45 minutes of writing, followed by a 15 minute break. Then another 45 minutes of writing. Please purchase something to support the cafe and the space ☺️ Follow us on Whatsapp! https://chat.whatsapp.com/HeZDsZNFD8BKn8JohRlbkI

\-\- ENTRY: 100 CZK \-\- 🎶 Everyone is welcome to the Open Mic Jam at Coffice every Friday evening. Enjoy a variety of drinks and food while listening to local artists. 👉 You can also be part of the fun and bring your talent by singing or playing a musical instrument. 👉 This event is already a classic for Fridays night in Prague, so don't worry.. there is always lot of people coming. 📍 WHERE: Coffice Prague: Malířská 14 - Holesovice (the closest tram stop is Kamnicka and Letenske Namesti) 🍸 The bar offers cocktails at promotional prices. There is as well beer, wine and more. 🍴 If you are hungry, we have delicious empanadas, a unique Argentinian food. 🪴 Come to enjoy our new place with a beautiful garden. ℹ️ If you get lost or need more info, just call or write on WhatsApp: Martín +420 774 890 273 Enrique +420 605 032 851 -- CZ 🚨Po několika týdnech ticha... COFFICE JE ZPĚT! 💪 Tímto pre-opening Open Mic-em chceme oslavit, že jsme zase spolu a už se na Vás moc těšíme. 👉 Zapište si novou lokalitu: Malířská 14 - Holešovice. 🚨 🎶 Všichni jsou vítáni na týdenním Open Mic Jamu v Coffice každý pátek večer. Vychutnejte si různé nápoje a poslechněte si místní umělce. 👉 Můžete se také zapojit do zábavy a přinést svůj talent zpěvem nebo hrou na hudební nástroj. 📍Nezapomeňte, že Coffice je zpět na novém místě! Adresa je Malířská 14 - Holešovice (nejbližší tramvajová zastávka je Letenské náměstí) Přijďte si užít naše nové místo s krásnou zahradou. Pokud se ztratíte nebo potřebujete více informací, stačí zavolat nebo napsat na WhatsApp: Martín +420 774 890 273 ........................................................................................................... FB: www.facebook.com/cofficeprague IG: https://www.instagram.com/cofficeprague 🌎 www.cofficeprague.com ........................................................................................................... By participating in our events, you agree to be photographed and/or filmed that might be shared on our social/ commercial purposes. Post your pictures and tag us @cofficeprague ........................................................................................................... Interested in our Events? 📩 info@cofficeprague.com 📞 Phone/WhatsApp: +420 774 890 273 Join the Group on Facebook: "Daily Meetups in Prague" ........................................................................................................... Are you looking for a Coworking Space in Prague? We have joined forces with Locus Workspace in Vinohrady and with this some benefits: \- 30% discount on your 1st month\. \- Those who are members of Locus\, will be able to work in both locations\. There in Vinohrady and here in Letna\. \- Free Trial Day If you are interested, please contact Us Via WhatsApp +420 774 890 273 or email (info@cofficeprague.com)

This group is for anyone who writes - for any reason. Have a thesis or article you need to write? Trying to finish a novel or an academic paper? This group is for you. We are currently meeting in-person at Locus Workspace. If you have any questions, contact Sonya Lano here or on Facebook or Messenger (https://www.facebook.com/sonya.lano). We start at 9:00, introduce ourselves, and share a few words about what we're working on and what we hope to accomplish during the session. At the end of the session, you can give us a brief recap of how it went. We'll break at noon. The afternoon session starts at 2:00 pm. You're welcome to join both sessions or just one. Please come as close to 9:00 as you can if you come for the morning session. If you come to the afternoon session, we are usually back by about a quarter to 2:00.

Free Event/Vstup Zdarma Pro češtinu, podívejte se níže EN Hello, people of Prague!! We bring you a forum to trade your language skills and learn something more. If not interested in language, you could have a general conversation. The goal is to create a chill environment for social networking with a focus on learning the language of your choice. So grab some beverages at the bar/cafe and get on with it every Thursday. **NEW** Venue: Tequila Tales Bar **NEW** Location: Ujezd 409/19, 11800 Malá Strana Timing: 1900-2200 (Every Thursday) \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- CZ Ahoj Pražáci!! Přinášíme vám fórum, kde můžete vyměnit své jazykové znalosti a dozvědět se něco víc. Cílem je vytvořit pohodové prostředí pro sociální sítě se zaměřením na výuku jazyka dle vašeho výběru. Takže si vezměte nějaké nápoje v baru/kavárně a pusťte se do toho každý čtvrtek. **NOVE** Místo: Tequila Tales Bar, Ujezd 409/19, 11800 Malá Strana Čas: 1900-2200 (každý čtvrtek)

Every month, Locus Workspace offers its space to location-independent professionals to work alongside one another for the day just for the price of a coffee (60 kč)! **IMPORTANT: Please note that you need to sign up through the link below to secure your spot for the event:** [SIGN UP HERE](https://locusworkspace.com/events/2026/02/27/coworking-for-a-coffee/) During the day, there may also be community moments you’re welcome to join. This can be as simple as sharing lunch together in the kitchen, enjoying a casual drink at the end of the day, or just chatting with other members by the coffee machine. Don’t be shy, we’re a bunch of friendly coworkers :) Have a good day of productive work, meet other freelancers, digital nomads, remote workers, solo-preneurs, and other location-independent professionals in Prague, and get to know the benefits of coworking.

Meeting @ Improving's office in Downtown Columbus, near Cosi. Parking is paid, food & drink are free! This time we're hanging out after the long winter break. We are going to look at a group-member's project used to help learn the fundamentals of Go, and if time allows, we can take a look at how we like to build Go projects using AI.

Come out to Improving for our monthly iOS and Mac meetings. This Month's Presentation: Nothing yet. (You should volunteer). What is Cocoaheads (http://cocoaheads.org/)? CocoaHeads is a group devoted to discussion of Apple Computer's Cocoa Framework for programming on MacOS X and iOS (including the iPhone, iPad and Apple Watch). During monthly meetings, members present on their projects and offer tutorials on various programming topics. What is BuckeyeCocoa (http://buckeyecocoa.org/)? BuckeyeCocoa is a group of Objective-C/Swift developers/enthusiasts. We host monthly Cocoaheads and near-weekly NSCoder meetings in Columbus, Ohio. The meetings are free to attend. Presentations! Presenters welcome! We are always in need of people willing to present material. Any Swift and/or Objective-C related topic is welcome. Times can be 5 minutes (i.e. lightning talks) to a maximum of 2 hours. Interested? Contact info is on the BuckeyeCocoa website. To volunteer for a presentation contact us at @BuckeyeCocoa on Twitter. Follow us on Twitter! @BuckeyeCocoa (https://twitter.com/#!/Buckeyecocoa/) For more information: http://buckeyecocoa.org/

**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** *Spec-Driven Development with GitHub Spec-Kit: From Intent to Implementation* Spec-driven development flips the traditional workflow on its head: instead of code being the source of truth, the specification becomes the backbone of design, collaboration, and delivery. In this session, we’ll explore how GitHub Spec-Kit enables teams to treat specifications as first-class artifacts—living documents that drive architecture, implementation, and verification. You’ll learn how Spec-Kit helps teams clearly express intent using structured, version-controlled specs that live alongside code. We’ll walk through a practical workflow that starts with defining system behavior and constraints, then progressively refines those specs into testable, automatable outcomes. Along the way, we’ll show how specs can reduce ambiguity, improve cross-functional collaboration, and make design decisions explicit before a single line of production code is written. This talk will cover: --What spec-driven development is (and what it isn’t) --How GitHub Spec-Kit fits into modern developer workflows --Using specs to align product, engineering, and AI-assisted development --Real-world examples of turning specs into implementations with confidence Whether you’re building greenfield systems, integrating AI into your stack, or trying to reduce costly rework, spec-driven development offers a scalable way to move faster without sacrificing clarity. Attendees will leave with concrete patterns and a clear mental model for adopting GitHub Spec-Kit in their own projects. **YouTube Link** TBA

Come attend a free in-person seminar where you will find out why you: -Feel isolated -Can't express yourself openly -Get nervous or anxious in front of people -Run out of things to say or feel tongue-tied -Feel introverted -Don't feel comfortable in any social setting -Can't make more friends -Are shy and miss opportunities to connect in a meaningful way And we cover what you can do about any one, some or all of the above. This seminar is the weapon against loneliness, isolation and boredom, come join us! COME TO THIS SEMINAR AND LEARN THE SECRETS TODAY This seminar is brought to you by the Dianetics & Scientology Life Improvement Center. 1266 Dublin Road, Columbus, Ohio 43215

**New Dojo Location!** **Draft Day Columbus** 1130 Dublin Road Columbus, OH 43215 We're going to try a new dojo location for a few weeks and see how it works Dojos are informal Python group study sessions where everyone interested in Python gathers to learn about Python, help others with Python, or just hang out. Everyone is welcome from Python beginners to experts. Bringing a laptop is encouraged (we'll have extension cords and power strips). If there's something you want to learn leave a comment on this invite so we can plan ahead. We're looking for topic suggestions and people interested in presenting at our monthly meetings. To this end we've set up a survey form at [https://docs.google.com/forms/d/15eBKF1nQQ2XS5gzD4rvhVRHMBEj7lJtHuA9wXupS3Uc](https://docs.google.com/forms/d/15eBKF1nQQ2XS5gzD4rvhVRHMBEj7lJtHuA9wXupS3Uc)

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

We will show a variety of methods for building agents that run in Microsoft Foundry. This covers the different types of agents: Prompt, Multi, and Hosted, as well as the development lifecycle using evals and traces.