Decentralized Systems & Applications

As real-time systems become the backbone of modern products, the way we design and operate data infrastructure is evolving fast. In this meetup, we’re bringing together experts from Riskified, Confluent, and Wix to show how Apache Flink and Apache Kafka power the next generation of streaming architectures—from resilient, fault-tolerant pipelines and reusable data products to AI-driven decisioning at massive scale. Whether you’re a data engineer, platform builder, or AI-curious developer, this evening will give you practical patterns and fresh ways to think about real-time systems. **Agenda:** 18:00 - 18:30 - Mingling, drinks, and snacks 18:30 - 19:00 - Supercharge Your FlinkSQL Job: Use a Hybrid API Approach to Achieve Perfection - Gal Krispel, Senior Data Platform Engineer at Riskified 19:00 - 19:30 - From Data Mess to Data Products: Unlocking Real‑Time Value with Data Streaming - Ohad Israeli, Senior Solutions Engineer Team Leader at Confluent 19:30 - 20:15 - AI vs. Karen: Building Real-Time Sentiment Analysis Pipelines at Scale - Josef Goldstein, Head of R&D, Big Data Platform at Wix.com 20:15 - More drinks and mingling The talks will be delivered in Hebrew. \-\-\-\-\-\-\-\-\-\-\-\- **// Supercharge Your FlinkSQL Job: Use a Hybrid API Approach to Achieve Perfection - Gal Krispel, Senior Data Platform Engineer at Riskified** Apache Flink’s SQL interface almost sounds like a dream: write standard SQL - get a full-blown streaming app. However, dreams and reality rarely align, and FlinkSQL achieved a questionable level of production readiness. In this session, we’ll explore the known upsides and downsides of FlinkSQL. From the enormous velocity and traction FlinkSQL can create in your organization, to sleepless nights of manual state interventions and unexpected data type inference. The good news is, there are ways to bypass obstacles and tap the most out of FlinkSQL’s benefits by using a Hybrid Flink API approach. We’ll examine the architecture of a fault-tolerant FlinkSQL job (using DLQ), bypass inherent FlinkSQL’s data-type limitations, and finally, show how we can set up our job to handle a massive load. Finally, we’ll also share step-by-step code examples of how to achieve it. ***About the speaker:*** Gal Krispel is a Data Platform Engineer at Riskified, specializing in streaming technologies such as Apache Kafka and Apache Flink. He focuses on building scalable, real-time data pipelines that power Riskified’s core products. Gal is particularly interested in making complex data architectures accessible and efficient across the organization. His work spans real-time analytics, event-driven design, and the seamless integration of stream processing into large-scale production systems. [LinkedIn](https://www.linkedin.com/in/gal-krispel/) **// From Data Mess to Data Products: Unlocking Real‑Time Value with Data Streaming - Ohad Israeli, Senior Solutions Engineer Team Leader at Confluent** This talk shows how organizations can move from brittle, point‑to‑point integrations to a data streaming “central nervous system” that powers reusable, trustworthy data products across both operational and analytical estates. We’ll cover the Stream–Connect–Govern–Process blueprint, pragmatic pipeline patterns into warehouses like Snowflake, and real‑world use cases from fraud detection to personalization—highlighting how reusable data products slash time‑to‑value and operating cost while improving data quality and freshness. Attendees will leave with a practical framework to standardize schemas, materialize real‑time pipelines, and reuse domain data products to accelerate AI/ML and analytics initiatives. ***About the speaker:*** Ohad Israeli is a Senior Solutions Engineer Team Leader at Confluent with 20+ years of experience in data architectures. He helps high‑growth tech teams turn streaming data into measurable outcomes using Confluent. His focus is real‑time, event‑driven architectures, faster paths to production, and reliability at scale. [LinkedIn](https://www.linkedin.com/in/israeliohad/) **// AI vs. Karen: Building Real-Time Sentiment Analysis Pipelines at Scale - Josef Goldstein, Head of R&D, Big Data Platform at Wix** We’ve all heard that “the customer is always right". But let’s be honest, some customers are just impossible to please. What if we could detect them before they turn into ALL-CAPS review bombers, in real-time? In this talk, we’ll walk through how to build AI-powered streaming pipelines using Apache Kafka and Apache Flink that can detect frustrated users and respond in real time at massive scale. We’ll explore how to embed AI models directly into data streams for live inference, discuss the trade-offs between using Large Language Models (LLMs) and Small Language Models (SLMs), and tackle the real-world challenges of latency, scale, and cost optimization in streaming AI architectures. Finally, we’ll demo a live end-to-end example, from data ingestion to AI scoring and visualization, that you can later run on your own setup. ***About the speaker:*** The data and culture guy. Currently leading the Big Data Platform R&D at Wix. Yossi has over 15 years of experience building data intensive SaaS applications and growing the awesome teams that make them. He believes that the secret sauce for creating sustainable complex systems is good design practices, effective communication between people, and automating everything. In his day to day he works tirelessly on building the culture necessary to support these values and propagate them to others, one pep-talk at a time. [LinkedIn](https://www.linkedin.com/in/josefgoldstein/)

**TAMI Voice (maintenance hour)** Good time to come and help with cleaning and sorting TAMI stuff for an hour as well as share your thoughts and ideas how to make TAMI a better place! Right after, we have HackaTAMI evening (from 20:00). ========== TAMI wiki: [https://telavivmakers.org](https://telavivmakers.org) TAMI main Telegram channel: [https://t.me/+0t5M0-jK9iIwZmM8](https://t.me/+0t5M0-jK9iIwZmM8)

**TAMI Hacking Nights** \- join TAMI CTF team and practice challenges and CTFs with us \- share your knowledge about ethical hacking techniques and tools \- bring some device to reverse engineer it and explore how it works \- propose a bug bounty program to work on together \- just watch and learn from others The meetings are informal and open to all levels - from total beginners to hardcore CTF veterans. Join our HackaTAMI Telegram channel ([https://t.me/+KAXY_iPcPlpmZTRk](https://t.me/+KAXY_iPcPlpmZTRk)) to discuss what we will do this Tuesday and come to TAMI. ========== TAMI wiki: [https://telavivmakers.org](https://telavivmakers.org) TAMI main Telegram channel: [https://t.me/+0t5M0-jK9iIwZmM8](https://t.me/+0t5M0-jK9iIwZmM8)

מוזמנים/ות לסדנת נגרות - אדנית חלון עם חריטת לייזר. במהלך הסדנה נתנסה במיומנויות נגרות בסיסיות: ניסור, שיוף, קדיחה והברגה ונתנסה בעבודה עם עץ, כל הדרך מחומר הגלם ועד אדנית יפייפיה מעשה ידינו, אותה תוכלו לעטר בחריטת לייזר. למבוגרים/ות (16+). מחיר: ₪200 מחיר לתושבי יהוד: ₪150 שימו לב: לא מספיק להרשם במיטאפ יש להרשם גם בקישור הבא , שם תמצאו גם פרטים נוספים https://link.makelab.org.il/Carpentry-window-planter

## Details Hi everyone, ⚠️ You need to join the Whatssapp community and get a confirmation on WhatssApp that there are still spots available in order to be able to attend. You can join the chess community here by filling the form: https://chessbarisrael.com/#join-us The next edition tournament will take place on **Tuesday.** 📍 **Where:** Masaryk Wine & Flowers, **80 King George St, Tel Aviv** 📅 **When:** 6:15 PM - 8:30 PM ♟️ **Format:** 5 rounds of 8+2 (Rapid) OR Meet & Play (depends on which Tuesday) 🥇 **Prizes:** * **Top Winners:** bottles of wine * **Best Under 1500/800:** 1 hour of private chess lesson * **Sandwich for a randomly picked player** ✨ **How does it work?** This is a friendly, unofficial event (not reported to FIDE) and part of a **bi-weekly series of tournaments** held in bars around Tel Aviv. ⚠️ There is an entrance fee for the event including the first free drink and prizes! **Spots are limited!** ⚠️ You need to join the Whatssapp community and get a confirmation on WhatssApp that there are still spots available in order to be able to attend. Olivier 🎉

**Web3 Devs Underground - December Meetup** **About the event:** **🎙 Brought to you by [Israel Web3 Developers Underground](http://web3devs.org/) × [Arbitrum](https://arbitrum.io/) x [Rapyd](https://www.rapyd.net/company/about-rapyd/) x [Ethereum Foundation](https://ethereum.foundation/) x [Backed.Fi](https://Backed.Fi)** Powered by [Masterkey VC](http://masterkey.vc/) **Date & Time** 📅 **Wednesday, Dec 24, 2026** **Time:** 17:00 - 20:00 **Location:** Location: Gornitzky GNY Law Firm, HaHarash St 20, Floor 26, Tel Aviv-Yafo, 6761310 [https://maps.app.goo.gl/pCqtSRPjyYCNcoGk9](https://maps.app.goo.gl/pCqtSRPjyYCNcoGk9) ## Speakers: * **[Steven Goldfelder](https://www.linkedin.com/in/sgoldfed/), Co-Founder & CEO of [Offchain Labs](https://www.offchainlabs.com/), the team behind [Arbitrum](https://arbitrum.io/)** * **[Arkady Karpman](https://www.linkedin.com/in/arkady-karpman-4904406/), CTO of [Rapyd](https://www.rapyd.net/company/about-rapyd/)** * [Adam Levi](https://www.linkedin.com/in/leviadam/) \- Co\-Founder @ [Backed.Fi](https://Backed.Fi) (Acquired by Kraken) * [Tom Teman](https://www.linkedin.com/in/tom-teman-83a49b8/) \- PM @ [Ethereum Foundation](https://ethereum.foundation/) * **Moderated by [Shauli Rejwan](https://www.linkedin.com/in/saul-shauli-rejwan/), Managing Partner @ [Masterkey VC](http://masterkey.vc)** ## Agenda: * **17:00-17:30** Gathering and Mingling * **17:30-17:40** Opening Remarks * **17:40-18:00** **1:1 Best Practices For The Technical Founder** By **[Arkady Karpman](https://www.linkedin.com/in/arkady-karpman-4904406/),** CTO @ **[Rapyd](https://www.rapyd.net/company/about-rapyd/).** * 18:00-18:15 Q&A with **[Arkady](https://www.linkedin.com/in/arkady-karpman-4904406/)** * 18:15-18:30 Break * 18:30-19:15 **Panel: The Future of DeFi RWA and Entrepreneurship** * [Stephen Goldfelder](https://www.linkedin.com/in/sgoldfed/), Co-Founder & CEO of [Offchain Labs](https://www.offchainlabs.com/) * [Adam Levi](https://www.linkedin.com/in/leviadam/) \- Co\-Founder @ [Backed.Fi](https://Backed.Fi) * [Tom Teman](https://www.linkedin.com/in/tom-teman-83a49b8/) \- PM @ Ethereum Foundation * Moderated by [Shauli Rejwan](https://www.linkedin.com/in/saul-shauli-rejwan/), Managing Partner @ [Masterkey VC](http://masterkey.vc) * 19:15-19:45 Q&A and open discussion **[Masterkey Venture Capital](http://masterkey.vc/)** is a global early-stage fund investing in top-tier innovative deep tech and Web3 infrastructure projects. With a strategic presence in key crypto hubs worldwide, we are uniquely positioned to drive technological advancements within global ecosystems. Backed by nearly 50 years of combined expertise in advanced infrastructure, novel cryptography, cybersecurity, and energy solutions, our team is dedicated to empowering the entrepreneurs shaping the future of blockchain technology. **About Our Host:** [GNY (Gornitzky)](https://www.gornitzky.com/) has pioneered quality legal services since before there was a State of Israel. Taking the lead in some of the most complex transactions and cases in the country, we have excelled at thought-leadership and originality, motivating a wide range of legal precedents that have changed the face of law and the economy in Israel. **Get Involved** **Interested in speaking, sponsoring, or taking an active part in the community?** We welcome passionate individuals and organizations to contribute to our community. If you're interested in speaking at future events, sponsoring our meetups, or becoming a part of our volunteers, don't hesitate to get in touch with Amit Shilo at @Amit_Shilo (Telegram) * Community Managers: Amit Shilo, Eden Luttenberg, Alon Kivity, and Alon Ben Lavy. * Founded by Shauli Rejwan and Roy Osherove. **RSVP Now!** Secure your spot for an evening of knowledge-sharing and networking. *Limited seats are available. Register early to ensure your participation!* **Stay Connected** Follow us on social media and join our community to stay updated on upcoming events and news: * **[Website](http://web3devs.org/)** * **[Linktree](https://linktr.ee/web3devsunderground)** * **[Telegram](https://t.me/+-sEflgfrqDoyYWVk)** Stay in the loop (socials): Twitter (X) – [https://x.com/Web3_Devs](https://x.com/Web3_Devs) YouTube – [https://www.youtube.com/@israelweb3devunderground](https://www.youtube.com/@israelweb3devunderground) (Watch our content) Calendar – [https://luma.com/web3devs_underground](https://luma.com/web3devs_underground) **See You There! (Also Online)**

**IT’S FLUENT’S 9th BIRTHDAYYYYY!** **When?** Saturday December 27th \| 20:30\-23:00 **Where?** Abraham Hostel Tel-Aviv **What to expect ?** *20:30-22:30:* Our traditional Language Exchange Event combined with fun games, festivities, and celebrations ! *22:30-23:00:* An exciting Language Trivia competition with the entire community (get the chance to win free entrances to our events!) + Yearly prizes and awards 🎁 Sign up here: [https://www.fluent.community/events/language-exchange-fluent-9th-birthday/](https://www.fluent.community/events/language-exchange-fluent-9th-birthday/) 🔹🔹🔹🔹🔹🔹🔹🔹🔹🔹 Discounted Prices (Available until 3pm on the day of the event!)🎟️ Ticket + soft drink = 60 NIS Ticket + beer/glass of wine = 70 NIS Prices for Walk-ins on the day of the Event 🎟️ Ticket + soft drink = 65 NIS Ticket + beer/glass of wine = 75 NIS 🔹🔹🔹🔹🔹🔹🔹🔹🔹🔹 Did you know that you can also enter the event **for free** and be an Ambassador? 😃 Ambassadors help others practice their native language for half of the evening, and get to practice other languages during the second half of the evening. See you there!!

Join the Maakaf open-source community for an exciting evening of deep dives into open-source contributions, distributed storage, and career growth, hosted at the Red Hat offices! **📍 Location:** Red Hat Offices 8 HaPnina Street, Ra'anana, IL ***Free parking starts at 18:00.*** **🗓️ Date & Time:** Wednesday, December 24, 2025 18:00 - 20:45 (Israel Time) \-\-\- **📝 Agenda** 18:00 - 18:30 - **Gathering & Networking** \| Grab a snack\, meet your fellow community members\, and mingle\! \| 18:30 - 19:00 - Talk 1: **The Death of Traditional Maintainers? AI Is Rewriting Open Source** \| Speaker: **Yuval Kashtan**, Ecosystem Engineering. \- AI doesn’t sleep\, but it does open pull requests—lots of them\. This talk breaks down how maintainers can keep their projects sane in a world where bots may be your most active contributors\. Expect practical advice\, real examples\, and a few laughs about the chaos AI brings to open source\. 19:10 - 19:40 - Talk 2: **Ceph and Google Summer of Code \(GSoC\): Open Source Contribution Opportunities \|** Speaker: **Yuval Lifshitz,** Senior Technical Staff Member at IBM. \- Are you looking for the perfect way to integrate significant open\-source projects with career development? This talk will focus on the leading open-source distributed storage system, **Ceph**, a Red Hat's project! As a developer involved with Ceph, I will share the advantages and disadvantages of contributing to this complex project, whether independently or as part of the Google Summer of Code (GSoC) program. GSoC allows students and developers to participate in meaningful open-source projects, receive mentorship from experienced developers, and even get paid for their work! 19:50 - 20:20 - Talk 3: **Technical Career Insights** \| Speaker: **Omer, Recruiter at Red Hat**. \- Omer\, a recruiter from Red Hat\, will share valuable insights and tips on navigating the tech career landscape\, specializing in what open\-source companies look for in candidates\. 20:20 \- 20:45 \-Mingling & Wrap\-Up \| A final chance to chat with the speakers and community before heading home\. \|

We’re excited about the upcoming meetup at Taboola's office! ### Schedule **17:30 - 18:00** – Mingling time! **18:15** – Spark Acceleration: To Spark and Beyond by Michael Taranov (Software Engineer @ Taboola) **18:45** – Distributed computing unpacked: by Meni Shmuali (Co-founder and CEO @ DataFlint) ### ⚠️ Important Taboola requires your **full name** for office entry. Please provide your LinkedIn profile when RSVP'ing for security reasons. Looking forward to seeing you there!

### ✮ CAPPELLA THURSDAY MAINSTREAM ✮ הרשמה חינם וכרטיסים: https://go-out.co/event/1765921590853?ref=a3fi92ff02 חמישי קפלה 🌃 לילה של מתנות במגדל 🎁 מיינסטרים ברחבה המרכזית & היפ הופ בחדר הסודי 🎅🏻 סילבסטר — מכירה נפתחה 💋 https://www.go-out.co/event/cappellanewyearseve?ref=a3fi92ff02 לערוץ השקט שלנו 👯‍♂️ https://shorturl.at/5yQtq להזמנת שולחנות / בר 🍸 https://tinyurl.com/krpwx45f 🎧Your playlist 🎧 **MAIN STAGE** DOR GAL BEN AZULAY (Mainstream) **Secret Room** DJ WIN SHABI (Hip Hop) \~\~\~\~\~\~\~\~\~ Cappella Haarbaa 28, Tel Aviv \~\~\~\~\~\~\~\~\~ דגשים חשובים מספר המקומות מוגבל הזמנת שולחנות החל מהשעה 20:30 אנחנו ממליצים בחום להגיע עד השעה 21:15 על מנת להימנע מהמתנה בכניסה יש לצרף קישור לחשבון אינסטגרם/פייסבוק זמין - ומספר טלפון לאדם. מזמין אשר יזין את .אותם פרטים יותר מפעם אחת אוטומטית לא יאושר בקאפלה יש אפס סבלנות להטרדות מינית, המרחב בטוח וחשוב לשמור על כך

## Details 18:00 - Mingling 🎉, SWAG 🎁, pizza 🍕, and beers 🍻 18:30 - 19:45 Lecturers 19:45 - IntelliJ Licenses + Node.TLV 20025 ticket 🎉 (more details in [https://www.nodetlv.com/)](https://www.nodetlv.com/)) ## Full Agenda From: Tal Doron : [Hebrew] **Querying for Evil: Using BigQuery to Find Threats in the SMB realm** This session dives into our practical approach for transforming massive volumes of cloud productivity logs into actionable security intelligence. We'll demonstrate how we leverage Google BigQuery as a highly-scalable data warehouse to store, process, and analyze this data at speed. You'll see how we execute complex, high-performance queries that uncover subtle anomalies, hunt for advanced threats, and provide critical detections to secure our customers. From [Anatol Zakrividoroga](https://www.linkedin.com/in/anatol-zak/overlay/about-this-profile/): [English] **Full-Stack Type Safety Without the Boilerplate: Meet tRPC** Keeping your frontend and backend in sync is hard — especially when API contracts drift, types get out of date, and your IDE stops being helpful. tRPC solves that by letting your backend define procedures that your frontend can call directly, with full TypeScript inference from end to end. In this talk, we’ll explore how tRPC eliminates unnecessary schemas and code generation while still delivering robust, type-safe communication between client and server. You’ll see how to set up a fully type-safe full-stack workflow, catch breaking changes before they hit production, and dramatically reduce the overhead of maintaining APIs. From: [‫Sagi Carmel](https://www.linkedin.com/in/sagicarmel/overlay/about-this-profile/): [Hebrew] **Promise you will learn something new about promises** Most of the time we are using Promises without reeeally understanding it's practical use v.s. what it was before. We will learn in a very interactive lesson the pure basic. Register via Luma -> [https://luma.com/b5bga495](https://luma.com/b5bga495) Kindly be informed that attendance at the meetup is on a first-come, first-served basis until capacity is reached. Although a place has been reserved for you (after click on attend button), please note that it **does not guarantee your spot.**

Monday December 29th at 6PM we'll be meeting up dinner at the Pies & Pints at Easton. Feel free to bring guests. Sandwiches run about $15 and large pizzas run $20-30.

In this local meeting, you will discover knowledge that you can use to get over the past. The key to improving your personal motivation, self-confidence, and happiness is to get over your painful memories. When you become free of your past, you will be free from stress, anger, anxiety and depression. Studies show that negative emotions can affect your health. By being free of negative emotions, believe it or not, you will most likely even look younger, feel more energetic, and become healthier! Be sure to click on the red "Attend" button below to come to this local event. We look forward to seeing you there. This group is brought to you by the Dianetics and Scientology life improvement center.

Christians in Tech is a community at the intersection of faith and technology. Our meetups are designed to spark meaningful conversations, promote knowledge sharing, and encourage growth—both in your career and your spiritual walk with God. Whether you're an experienced professional or just starting your tech journey, CIT welcomes you. Our Website [https://linktr.ee/citcbus](https://linktr.ee/citcbus) Sponsors and Partners * Improving (Venue Sponsor) * Bethel World Prayer Center (Fiscal Sponsor) * Fruits & Roots (Coffee Partner)

Private Group. Closed to the Public Knowing ourselves and understanding our abilities is the first step toward wielding our gifts with control and accuracy. In subsequent classes we will verify and hone our talents with activities and discussion. These are hands-on workshops and participation is expected. The goal of our series will be to develop expertise in areas of particular interest such as mediumship, channeling, divination, healing and, etc.. Our ultimate directions will be determined by class members as we evolve. I look forward to sharing and discovering with you. - Cynthia

Some trained COUNT volunteers work together once a month at RMH (http://www.rmhc-centralohio.org/volunteer.php) as Housewarmers (usually on the 1st Sunday from 1 – 5 PM). Some schedule other shifts at their convenience. You may try this out with less fuss by following a "Fast track" or go through the normal process. Fast track • Arrange a time to shadow a COUNT volunteer. Call Dave Nohle at 614-268-9558 (cell). • Show up and try it out. • Complete application, etc. later. Normal process • Complete an online application (http://rmhc-centralohio.org/volunteer/). • Attend orientation in advance. • At orientation you will complete forms agreeing to keep family/patient info private and allowing a background check and tour the facility. • Complete one training shift. Daily shifts are: morning 9 AM - 1 PM, afternoon 1 - 5 PM and evening 5 - 9 PM. • Schedule shifts online using the on the RMH scheduling system (http://www.volgistics.com/ex/portal.dll/?FROM=32895). The Ronald McDonald House (RMH) provides housing and meals for families with sick children. The Columbus RMH is the largest in the world with 137 rooms. COUNT has been volunteering there since May 2014. Housewarmers work with RMH guests to provide a home-like environment - greet, assist with family needs, answer phones, give tours, assist with checkin/checkout, prepare guest rooms after checkout, clean facility, laundry, restock supplies and staff the front desk. RMH Housewarmers volunteer at least one four-hour shift a month. All Housewarmers must complete an application and agree to a background check before they can be full fledged volunteers.