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What happens when **Data** **Streams**, **Kafka Queues** and **LLMs** walk into a meetup in Athens? See for yourself! **Viktor Gamov** \- Principal Developer Advocate \(Confluent\) **and** **Sandon Jacobs** \- Developer Advocate \(Confluent\) will be dropping by to talk about: * **The Missing Protocol: How MCP Bridges LLMs** **and Data Streams** \- Viktor Gamov * **What you can do with a Kafka Queue** \- Sandon Jacobs Join us for an exciting and insightful evening, get to know the growing community while geeking and networking! 📍 You will find us at **ImpactHub Athens,** Karaiskaki 28, Athens 105 54 🕡 at **6:30 pm** 📅 on the **22nd** of **April** Big shoutout to **Confluent** for making this event happen! Their active support is what helps the community grow even bigger! 💪

**🎉 Our very first NestJS Meetup!** Join us for an after-work technical meetup focused entirely on the **NestJS Framework**. Connect with fellow engineers over drinks and snacks, and dive into practical, architecture-focused sessions designed to level up your backend development. Whether you're exploring the framework or deploying it at scale, this event is built for you. **Talk 1: From Request to Response – Observing Fastify in NestJS** * **Getting Started:** Core concepts, project scaffolding, and leveraging NestJS's modular architecture for scalable applications. * **The Request Lifecycle:** A deep dive into the execution flow. Understand the exact ordering of Middleware, Guards, Interceptors, Pipes, Exception Filters, and Controllers. * **Observability with Interceptors:** Implement cross-cutting concerns (logging, metrics, payload transformation, error tracking) cleanly without polluting business logic. **Talk 2: Clean CQRS with Pipelines** * **CQRS Implementation:** Build clean and maintainable CQRS architectures using pipeline behaviors for commands, queries, and events. * **Centralized Logic:** Encapsulate logging, correlation IDs, authorization, and validation in reusable components. * **The Outcome:** Achieve decoupled event flows, consistent validation, and significantly improved system maintainability. **Event Details** * Two technical deep-dives + Q&A + Networking * Drinks & Snacks provided * Backend Engineers. All NestJS experience levels welcome! Come learn, share your architectural insights, and help grow the local NestJS engineering community. We look forward to seeing you!

Θέλετε να βελτιώσετε τις ικανότητές σας στην ομιλία μπροστά σε κοινό; Θέλετε να ξεπεράσετε το τρακ της δημόσιας ομιλίας; Ελάτε στην επόμενή μας συνάντηση Toastmasters! Δημιουργούμε όλοι μαζί ένα ανοικτό, φιλικό και ευχάριστο περιβάλλον, στο οποίο εξασκούμε τον δημόσιο λόγο και αξιολογούμε ο ένας τον άλλον. Εφαρμόζουμε το δοκιμασμένο πρόγραμμα των Toastmasters που έχει ιστορία άνω των 100 ετών και εφαρμόζεται στην Ελλάδα από το 2005. Περισσότερες πληροφορίες στο: https://web.facebook.com/profile.php?id=61556529585790 Συναντιόμαστε 2 φορές τον μήνα, την δεύτερη και τέταρτη Πέμπτη κάθε μήνα, από Σεπτέμβριο μέχρι και Ιούλιο (εκτός περιόδων Χριστουγέννων-Πρωτοχρονιάς & Πάσχα). This will be a Greek-speaking meeting. For our English-speaking meetings please see our page at https://www.meetup.com/ethos-pathos-logos-toastmasters-club.

👋 Hello guys and gals, 👋 🎉🎉🎉 Get ready for the after Summer event. 🎉🎉🎉 Doors open at 18:00 18:15 - 18:30 - Gathering and welcome from the organizers. 18:30 - 19:00 - Faris Aziz - The Hidden Battleground, Engineering High-Conversion Payment Experiences 19:00 - 19:30 - Nestor Lopez Federation of Specialists: From Module Federation to AI Orchestration 19:30 - 20:00 - George Karalis - Exploring MCP Apps: Practical Use Cases for the Enterprise [Get your CityJS Athens Blind tickets now before the end of Month as our prices will go Save 50% off.](https://athens.cityjsconf.org) **Faris Aziz - The Hidden Battleground, Engineering High-Conversion Payment Experiences** For most products, the checkout is the most critical and fragile part of the funnel. It’s where traffic turns into revenue, where small UX regressions compound into large financial losses, and where system failures become immediately visible on the balance sheet. This talk explores how to build resilient, high-converting payment experiences as systems, not screens. Drawing on hundreds of A/B experiments run on tens of millions of users and lessons from operating a global subscription platform generating tens of millions in annual recurring revenue, we’ll look at how payment orchestration evolves as products scale across regions, currencies, and providers. We’ll cover how to design checkout UX that converts consistently even for low-frequency products, how to orchestrate multiple gateways without leaking complexity to the user, and how to test and monitor flows where failure tolerance is extremely low. Along the way, I’ll even show a shocking example where adding just two form inputs, implemented correctly, could cost over a million dollars in lost revenue. This is a practical talk from the trenches about why checkout is a hidden battleground, and how resilient payment engineering protects both conversion and growth. **Nestor Lopez //** **Federation of Specialists: From Module Federation to AI Orchestration** The industry has already learned how to break frontend monoliths apart without breaking the product experience. A similar shift is now happening in AI. This talk traces the move from federated UI and composable runtime systems to a federation of AI specialists—and shows why production AI works better when agents have clear roles, controlled tools, workflow hooks, shared collaboration context, and policy boundaries. **George Karalis - Exploring MCP Apps: Practical Use Cases for the Enterprise** What happens when you give an LLM structured access to your company's actual systems, its APIs, data, internal tools? MCP Apps are a new extension to the Model Context Protocol that lets servers return interactive HTML interfaces, dashboards, forms, data explorers, rendered directly inside the conversation. Instead of bouncing users between chat and separate web apps, the UI lives right where the discussion happens, with bidirectional data flow and sandboxed security. We'll look at how tool handlers expose API endpoints to LLMs, how OAuth fits into the picture, and how the data and context flow into a React app rendered inside the conversation. Whether you're considering MCP for your own product or just curious about what generative UI looks like, this talk will give you a practical intro on building AI-native enterprise tools with React. A word from our sponsors. * [EPIGNOSIS](https://www.epignosishq.com/) * [CityJS Conferences](https://cityjsconf.org) 🏆Mini surprise🏆 🍕Pizzas🍕 🦸‍♀️Socializing🦸‍♂️!

We are pleased to bring you two talks this time. This event will be held in the offices of our sponsor Moro Technology, 28is Oktovriou 5, Omonia square, Stoa Trikoupi. **1st talk:** "Building with Antigravity" by [Mete Atamel ](https://www.linkedin.com/in/meteatamel/) **Abstract:** Google Antigravity transforms your regular IDE into an agentic development platform. Beyond basic tab completion, Antigravity offers an intuitive, artifact-based approach to monitoring and providing feedback to agents. By utilizing rules, workflows, and skills, you can fully customize the environment to your team’s best practices, while a dedicated browser subagent handles tasks outside the editor. Last but not least, its Agent Manager can spin up and coordinate multiple parallel agents across various workflows, allowing you to work at a higher level than the code itself. **Presenter:** Mete is a Software Engineer and a Developer Advocate at Google in London. He builds tools, demos, tutorials, and [gives talks](https://atamel.dev/speaker-profile/) to educate and help developers to be successful on Google Cloud. **2nd talk:** "Beyond RCA Speed: Understanding Change in Modern Production Systems" by [Spiros Economakis](https://www.linkedin.com/in/spirosoik/) **Abstract:** In cloud-native environments, deployments, configuration updates, scaling events, and dependency changes continuously reshape system behavior. Incidents rarely arrive without warning, they emerge from subtle interactions and behavioral drift that are difficult to interpret using dashboards, alerts, or post-incident analysis alone. This talk explores why improving root cause speed eventually plateaus, and why many teams are shifting focus toward understanding how change propagates through production systems. **Presenter:** A systems engineer with over 12 years of experience in diverse tech environments and author of "Argo CD in Practice" book. Founder & CEO of [NOFire AI](https://www.nofire.ai/). A Full Context Embedded SRE platform that operates across the entire lifecycle. Before Change, During Failure, After Resolution.

**Attend our 383rd Educational Meeting!** Improve your communication skills! Overcome your fear of public speaking! Experience the incredible training of Toastmasters International! Together we practice our public speaking and communication skills in an open, fun, and friendly environment! Our meetings alternate between English and Greek, with prepared speeches presented in both languages. This meeting will be conducted in **English**. We meet on **Tuesdays**. Arrival time is 18:45. **Guests are always welcomed! Simply RSVP and attend!** Educational meetings until end of June: April 21\, 2026 \| English May 5\, 2026 \| Greek May 19\, 2026 \| English June 2\, 2026 \| Greek June 16\, 2026 \| English June 30\, 2026 \| Greek 1924\-2024 \| 100 years Toastmasters International

Book your place at www.basketble.com Time: 17.00-18.30 (Athens Time) Duration: 1.5 hours Price: 10 Euros (payment at the basketball court) Facilities: Underground parking Game Setup (depending on the number of players) 3 teams of 5 players playing against each other Winner stays on but maximum 2 games 7 minute games You can play in the same team with your friends or we will place you in a team Come Out and Play!

**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** GitHub Copilot is powerful, but what if you could scale from a solo AI assistant to an entire team of specialized agents working in parallel? This session introduces Squad: an open-source framework for multi-agent orchestration that lets you define teams of AI agents with specific roles, responsibilities, and expertise. We'll progress from Copilot basics to the Copilot CLI, explore how Agents add autonomy, and see how Instructions and Skills let you customize agent behavior. Then, the climax: a live demo where a Squad team of 3 agents (Lead, Developer, Tester) stands up and builds a working application in real-time, showcasing true multi-agent collaboration. Whether you're new to AI or exploring how to scale your use of Copilot, this session will show you what's possible when agents work as a team. **YouTube Link** TBD