Smart Contracts

Sofia's social scene needs you on Monday. We're hosting a casual Sofia Expats meetup – a relaxed evening for locals and expats to meet, chat, and just enjoy good company. * Monday, 25 May * 19:00 * Edin Bar, Graf Ignatiev 24 Join the event on Facebook for updates: https://www.facebook.com/events/3061894383995653 Whether you moved here last week or you've been calling Sofia home for years, this is your chance to expand your circle a little. Come meet someone who's been through the same bureaucratic nightmare you have. Get a restaurant recommendation from a local. Or just have a fun Monday evening. We'll be somewhere central in Sofia. Exact location dropping soon – RSVP so you don't miss it. See you there! 🙋‍♀️ Coming solo? Don't worry. Maria and Liliya will be welcoming guests so you don't have to feel alone or awkward. \*\*\*\*\*\*\*\*\*\*\* [www.SofiaExpats.com](https://l.facebook.com/l.php?u=http%3A%2F%2Fwww.SofiaExpats.com%2F%3Ffbclid%3DIwZXh0bgNhZW0CMTAAYnJpZBExd3hHT2kwT0hYM1FJUVBqVHNydGMGYXBwX2lkEDIyMjAzOTE3ODgyMDA4OTIAAR4rvS_PRHmgSC7UU9UYlc-BPWM9KMuZiK56bB9rt7jEFcc0TkeZcoU4W66GwA_aem_FqS6xhLF7_vVzoLVjpptqg&h=AUCS35FfpViN9L_zstBoH9Kmyry7hnT_QM_RQnX_5ksaKMLJsnJA71iWkywvMisjH7MFCMVhwZxpki9iPopG677ADnR5MPEbBQl3AQzCUShitSjyy_c1ZZdPANmjbw60zGD7zOCSu2FrmZDIVH8&__tn__=q&c%5B0%5D=AUDP8EuZzbYxR3zlgOCMIfPqvxafb0aHHkC_-BxUbPdmnPqIrHOcUac9Tzd6NzkU1CHKRi0qGmkrJKdsn6Z51O2rr8-_rPbI2CaWLk81QOPR6wFrf8iiS8sTCs-KzIe8J2JLqkkKbjGy044mfEbxDNd9kBYNng) is your not-boring weekly newsletter for English-friendly events, activities and cultural tips. Subscribe to receive it every Monday. 📸 Keep in mind that pictures will be taken during the event for marketing purposes.

*This event features presentations in both English and Bulgarian.* Силен старт на крипто лятото! Миналия месец се надявахме, че сме оцелели след дъното. Този месец видяхме токени, които се покачиха с до 50%. Изглежда не сме сгрешили. След месеци на спадове, несигурност и пазар, който дълго време изглеждаше изтощен, нещо най-после се размърда. И не само на графиките. Имаме три добри новини за този месец: Първо, пазарът показа зъби. Второ, САЩ продължават да бутат напред с добра крипто регулация. Трето (и може би най-забавното): Prediction Markets се оказаха толкова успешни, че България реши да ги блокира (за първи път още през февруари). Когато регулатор бърза да забрани нещо, обикновено това е знак, че там се случва нещо интересно. На следващия Sofia Crypto Meetup ще обсъдим: Кои токени се представиха най-добре и защо. Какво всъщност представляват Prediction Markets и защо толкова много хора (и държави) говорят за тях. Какво може да очакваме през лятото - кои са реалните сценарии, а не магическите прогнози. Никакви празни приказки, никакви обещания за бързо забогатяване. Просто разговор по същество, добър анализ и достатъчно време за въпроси и дискусия. Елате да го отпразнуваме заедно. Дъното е зад нас, лятото е пред нас, а разговорът ще бъде интересен. Очаквайте и много специален гост!

Здравейте, WordPress хора! Както знаете, благодарение на Matt Mullenweg и Mike Little, на 27 май 2003 г. един млад проект с отворен код направи първите си стъпки в света - и ето ни 23 години по-късно, все още влюбени в него. Двама души го създадоха, но хиляди доброволци, разработчици, дизайнери и ентусиасти по целия свят го превърнаха в това, което е днес. Затова на 27 май 2026 г. отново ще се съберем в София, за да вдигнем тост (и хапнем парче торта) за рождения ден на любимата ни платформа! Какво ни очаква? Среща с хора, които говорят на нашия език - този на темите, плъгините, къстъмизациите и късните нощи в WordPress редактора. Очакват ни разговори, хапване, торта и онова специално усещане, когато общността се събере на едно място. Докато ние празнуваме в София, хиляди WordPress ентусиасти по целия свят правят същото – а ние сме част от тази голяма картина. Без значение дали си разработчик с 15 години стаж, дизайнер, който прави първия си сайт, блогър, агенция или просто човек, който обича отворения код – има място за теб на тази маса. Малко повече инфо: 🎟️ Събитието е напълно безплатно. Единственото, което трябва да направите, е да се регистрирате в събитието в Meetup.com. 📍 Мястото? Добре познатото ни Sky Beauty Lab! 👕 Донеси любимият си суаг! Извади от гардероба най-готината WordPress тениска, шапката с логото, чорапите с Wapuu – каквото имаш. И не забравяй да публикуваш снимки с хаштаговете #WP23 и #WP23Sofia, за да покажем на света как празнува българската общност. Благодарности: Това парти нямаше да е възможно без партньорите ни, които стоят зад WordPress Sofia Meetup и общността ни вече години наред – [SuperHosting.BG](SuperHosting.BG), [Delta.BG](Delta.BG), [Jump.bg](Jump.bg) и [JetHost.BG](JetHost.BG). Благодарим ви, приятели! <3 Заредете доброто си настроение, отворете календара и си запазете датата. За тези, които не знаят: месечните срещи на WordPress Sofia Meetup събират десетки хора (независимо дали са професионалисти или абсолютно начинаещи), които по някакъв начин са свързани с най-използваната система за управление на съдържанието в света. Те са напълно безплатни и отворени за всички, които обичат WordPress - единственото нещо, което трябва да направите, за да присъствате, е да се регистрирате в събитията тук. Очакваме ви! Фори, Ники, Явор

Последно за сезона издание преди лятната ваканция! ☀️ И това ако не е повод да се видим! 🙂🎉 **Python Meetup @ Sofia** 🐍 е тук през май 🌸 с интересна тема 💡 и почерпка 🍻 преди така дългоочакваните летни месеци! Ще се съберем в края на май 📅, ще споделим опит 🤓, ще се почерпим 🍹 и ще си поговорим 💬, по стара пайтънмийтъпска традиция ;) **🗓️ Датата е 26-ти май, а мястото е 📍Barter Community Hub 🏢.** **Започваме в ⏰ 19:00ч.** 🎫 Събитието е напълно безплатно ✅, нужно е само да потвърдиш присъствие тук 🙌 📢 Тема: **Async Python: The (bright) future after the end of GIL** 👨‍💻 Лектор: **Ивайло Дончев** 💭 **За какво ще си говорим:** Когато говорим за асинхронното програмиране с Python 🐍, винаги изниква една мистична абревиатура - GIL 🤔. В лекцията ще говорим за това как се промени асинхронното програмиране в python през годините 📈, какво е GIL, защо беше нужен, защо беше нужно да се премахне ❌ и какво означава това на практика ⚙️. Лекцията ще бъде на български език! 🇧🇬 🎙️ **За лектора:** Ивайло Дончев е Senior Full Stack developer 👨‍💻 и Technical Team Lead 🧠 в Waracle (България). Има 10+ години опит с Python 🐍 и Django, лектор на EuroPython 2018, 2022 и 2023 🎤 и лектор на курсовете на HackBulgaria 📚. След лекцията продължаваме в networking частта 🤝 с традиционната почерпка 🍻 от нашите партньори от **[Waracle](https://waracle.com/)** 🙏. Разбира се, ще има и томбола 🎁. А след това ще се отдадем на заслужена лятна почивка 🏖️ и ще се видим отново през септември 🍂! Както се казва, да сме живи и здрави! 🙏 Очакваме те на 26-ти май в Barter Community Hub!📍 Започваме точно в 19:00! ⏰ \-\-\- Final edition of the season before the summer break! ☀️ If that’s not a reason to get together, we don’t know what is! 🙂🎉 **Python Meetup @ Sofia** 🐍 is back this May 🌸 with a great topic 💡 and some treats 🍻 before we head into those long-awaited summer months! We’re gathering at the end of May 📅 to share knowledge 🤓, grab a drink 🍹, and catch up 💬, just like in the good old Python Meetup tradition ;) 🗓️ Date: **May 26** 📍 Location: **Barter Community Hub** 🏢 ⏰ Time: **19:00** 🎫 The event is completely free ✅ - just make sure to RSVP 🙌 📢 Topic: **Async Python: The (bright) future after the end of GIL** 🚀 👨‍💻 Speaker: **Ivaylo Donchev** **💭 What we’ll cover:** When we talk about asynchronous programming with Python, a mysterious abbreviation always comes up - GIL. 🤔 In the lecture we will talk about how asynchronous programming in Python has changed over the years 📈, what GIL is, why it was needed, why it needed to be removed❌ and what it means in practice.⚙️ The talk will be in Bulgarian 🇧🇬. 🎙️ **About the speaker:** Ivaylo Donchev is a Senior Full Stack Developer 👨‍💻 and Technical Team Lead 🧠 at Waracle (Bulgaria). He has 10+ years of experience with Python 🐍 and Django, has spoken at EuroPython (2018, 2022, 2023) 🎤, and is also a lecturer at HackBulgaria 📚. After the talk, we’ll continue with a networking session 🤝, featuring complimentary drinks 🍻 kindly provided by our partners at **[Waracle](https://waracle.com/)**[ ](https://waracle.com/)🙏. And yes… there will be a raffle 🎁! Then it’s time for a well-deserved summer break 🏖️, and we’ll be back in September 🍂. Until then - stay awesome and take care! 🙏 See you on May 26 at Barter Community Hub!📍 We start right at 19:00 ⏰

**Founders Running Club** (FRC) brings founders, investors, tech, creative people and startup enthusiasts together for weekly easy runs and networking. We like to be comfortable when we run and finish with coffee and conversations. Choose your pace or follow a pacer—pets, friends, family, are welcome. 🗓️ Launched in San Francisco, July 16, 2022 🌍 Now in 35+ cities 📅 Running + Networking events + Community **Join the community** [http://foundersrc.com/chats](http://foundersrc.com/chats) **Stay updated**: Instagram [http://instagram.com/foundersrc/](http://instagram.com/foundersrc/) Podcast [http://podcast.foundersrc.com/](http://podcast.foundersrc.com/) LinkedIn [http://linkedin.com/company/foundersrc/](http://linkedin.com/company/foundersrc/) Strava [http://strava.com/clubs/foundersRC](http://strava.com/clubs/foundersRC) Website [http://foundersrc.com/](http://foundersrc.com/)

Sofia's social scene needs you on Monday. We're hosting a casual Sofia Expats meetup – a relaxed evening for locals and expats to meet, chat, and just enjoy good company. * Monday, 25 May * 19:00 * Edin Bar, Graf Ignatiev 24 Join the event on Facebook for updates: https://www.facebook.com/events/3061894383995653 Whether you moved here last week or you've been calling Sofia home for years, this is your chance to expand your circle a little. Come meet someone who's been through the same bureaucratic nightmare you have. Get a restaurant recommendation from a local. Or just have a fun Monday evening. We'll be somewhere central in Sofia. Exact location dropping soon – RSVP so you don't miss it. See you there! 🙋‍♀️ Coming solo? Don't worry. Maria and Liliya will be welcoming guests so you don't have to feel alone or awkward. \*\*\*\*\*\*\*\*\*\*\* [www.SofiaExpats.com](https://l.facebook.com/l.php?u=http%3A%2F%2Fwww.SofiaExpats.com%2F%3Ffbclid%3DIwZXh0bgNhZW0CMTAAYnJpZBExd3hHT2kwT0hYM1FJUVBqVHNydGMGYXBwX2lkEDIyMjAzOTE3ODgyMDA4OTIAAR4rvS_PRHmgSC7UU9UYlc-BPWM9KMuZiK56bB9rt7jEFcc0TkeZcoU4W66GwA_aem_FqS6xhLF7_vVzoLVjpptqg&h=AUCS35FfpViN9L_zstBoH9Kmyry7hnT_QM_RQnX_5ksaKMLJsnJA71iWkywvMisjH7MFCMVhwZxpki9iPopG677ADnR5MPEbBQl3AQzCUShitSjyy_c1ZZdPANmjbw60zGD7zOCSu2FrmZDIVH8&__tn__=q&c%5B0%5D=AUDP8EuZzbYxR3zlgOCMIfPqvxafb0aHHkC_-BxUbPdmnPqIrHOcUac9Tzd6NzkU1CHKRi0qGmkrJKdsn6Z51O2rr8-_rPbI2CaWLk81QOPR6wFrf8iiS8sTCs-KzIe8J2JLqkkKbjGy044mfEbxDNd9kBYNng) is your not-boring weekly newsletter for English-friendly events, activities and cultural tips. Subscribe to receive it every Monday. 📸 Keep in mind that pictures will be taken during the event for marketing purposes.

Combinatorial optimization problems arise across logistics, scheduling, and engineering, and C++ remains a language of choice when performance matters. This lecture takes a practical look at solving such problems in C++, using the Electric Vehicle Routing Problem as a running example. We begin with an exact solver, formulating the problem as a mixed-integer program and trying to solve it through GLPK's C API directly from C++. Exact methods, however, quickly hit their limits on real-world instances. The second half of the talk turns to metaheuristics: how they are designed, why C++ is particularly well suited for implementing them, and what design choices matter most in practice. We'll walk through a concrete implementation, touching on data structures for fast neighborhood evaluation, generic algorithm design with templates, and the performance considerations that separate a prototype from a production-ready solver. The goal is not to advocate for one approach over another, but to show how C++ supports the full spectrum of optimization techniques. # About Speaker Luka Matijević is a researcher at the Mathematical Institute of the Serbian Academy of Sciences and Arts, whose work bridges academic research and freelance engineering. He's drawn to identifying the right algorithm for a given problem — and to the kind of careful optimization captured by one of his favourite Futurama lines: *"When you do things right, people won't be sure you've done anything at all."* ## 📅 Event Details | | | | --- | --- | | 👤 **Speaker** | **[Luka Matijević](https://www.linkedin.com/in/luka-matijevic/)** | | 🕕 **Date & Time** | **27th of May (Wednesday), 6 pm** | | 📍 **Location** | **Beograđanka, Vidikovac, 22nd floor** | | 🏢 **Address** | **Masarikova 5** | | 💻 **Online** | **[C++ Serbia YouTube](https://www.youtube.com/@cppserbia)** | See you!

**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

Let’s meet and wander the galleries! General admission on Sundays is free.

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/

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.

(Note: RSVPing here on meetup does NOT reserve your seat. To do that, you’ll need to register at our website, **[HERE](https://www.coreerocks.com/Events.aspx?ID=In-Person-Columbus-Meeting-How-I-Get-Private-Lenders-and-Partners-to-Fund-My-Deals-14-6-2-2026)**.) Tuesday, June 2nd, 5:00–8:30 PM Eastern Central Ohio Chapter Meeting IN PERSON IN COLUMBUS How I Get Private Lenders and Partners to Fund My Deals If you can’t fund it, you don’t have a deal. And right now, funding is where more investors are getting stuck. Private lenders are more cautious. Partners are asking better questions. And deals that look good on paper still fall apart when the money doesn’t show up. That’s why we’re bringing in a panel of investors who are actually getting their deals funded right now. You’ll hear how they’re finding money, structuring deals, and building relationships that lead to repeat funding. Here’s what you’ll learn: * Where they’re finding private lenders today * How they start conversations that lead to funding * What makes lenders and partners say YES * How they structure deals to be fundable * The biggest mistakes investors make when raising money * How to build repeat funding relationships **Early Session (6:00–7:00 PM Eastern):** **Having Trouble Finding Tenants? How Community Shelter Board Can Help** Nicholas Brenner will walk you through programs designed to help rapidly rehouse tenants, including financial support that can stabilize your rentals. **The Deal Room (7:00–7:30 PM Eastern)** Bring deals, funding needs, buyers, and problems. This is where connections turn into action. This meeting is for serious real estate investors nationwide, and we’re known for our high-content, real-life education and our nationwide community of dealmakers. Members and non-members at all levels are welcome. Register below to reserve your seat. Remember, to actually reserve your seat, you have to go **[HERE](https://www.coreerocks.com/Events.aspx?ID=In-Person-Columbus-Meeting-How-I-Get-Private-Lenders-and-Partners-to-Fund-My-Deals-14-6-2-2026)** and register on our website!

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.

Most people use AI like a search box: they type one sentence, hope for the best, and get frustrated when the answer is generic, wrong, or useless. But getting better results from tools like ChatGPT, Claude, Gemini, and other AI systems is not about memorizing magic prompts. It is about learning how to give the AI better context. In this beginner-friendly session, we’ll break down how to make AI dramatically more useful by improving the way you communicate with it. You’ll learn how to give clearer instructions, provide examples, set constraints, ask for better output formats, and use follow-up questions to turn a mediocre answer into a genuinely useful one. We’ll cover practical techniques you can use immediately for work, learning, writing, coding, planning, research, and everyday problem solving. We’ll also touch on why these same ideas show up in more advanced AI systems, including RAG, agents, evaluations, and AI workflows. No technical background required. Bring your curiosity, your questions, and maybe one real task you wish AI was better at helping you with. **What you’ll learn:** * Why “better prompting” is really about better context * How to structure requests so AI gives more useful answers * How to use examples, constraints, and output formats * How to iterate when the first answer is not good enough * How these skills connect to more advanced AI workflows This meetup is for anyone who wants to move beyond basic ChatGPT usage and start getting more practical value out of AI. 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.