Software Architecture

In many organizations, APIs are treated as technical contracts — neat documentation of endpoints and payloads. But what if APIs could become something more: living expressions of the business domain itself? This talk examines how Domain-Driven Design (DDD) and modern API craftsmanship converge to establish a shared language between people and systems. We’ll walk through how techniques like Domain Storytelling, Event Storming, and Context Mapping can lead directly into OpenAPI and AsyncAPI specifications that reflect real domain intent — not just data structures. **How can LLM help?** Along the way, we’ll see how Large Language Models (LLMs) can amplify human creativity — helping teams turn visual domain artifacts into executable API contracts while preserving intent and nuance. Instead of replacing design thinking, AI becomes a collaborator in the craftsmanship process. Through practical examples, we’ll explore how bounded contexts define API boundaries, how ubiquitous language shapes resource and event models, and how contract-first design enables safe, evolutionary change. By the end, you’ll see APIs not merely as integration points, but as living domain boundaries to align architecture, business, and shared understanding. **About the speaker** [Annegret](https://www.linkedin.com/in/dr-annegret-junker-141a99a4/) is Chief Software Architect at codecentric AG in Germany. She has worked in software development for over 30 years. She worked in quite different roles and domains. She is especially interested in DDD, microservices, and everything else. She is working on a large integration project and defines APIs for partners. **The Sponsor** This time, the location, food, and drinks are sponsored by [TechTalk](https://techtalk.at/). Thank you very much, TechTalk, you rock! 🎉 This will be a joined event with the Microservices, Reactive and Distributed Systems Vienna Meetup ([https://www.meetup.com/reactive-vienna/](https://www.meetup.com/reactive-vienna/)) and it is enough to register for only one of the meetups. It is not necessary to register for both! Space is limited, so please register if you want to come. As always, we're very much looking forward to seeing you! Best regards, Daniel and Gottfried

In many organizations, APIs are treated as technical contracts — neat documentation of endpoints and payloads. But what if APIs could become something more: living expressions of the business domain itself? This talk examines how Domain-Driven Design (DDD) and modern API craftsmanship converge to establish a shared language between people and systems. We’ll walk through how techniques like Domain Storytelling, Event Storming, and Context Mapping can lead directly into OpenAPI and AsyncAPI specifications that reflect real domain intent — not just data structures. **How can LLM help?** Along the way, we’ll see how Large Language Models (LLMs) can amplify human creativity — helping teams turn visual domain artifacts into executable API contracts while preserving intent and nuance. Instead of replacing design thinking, AI becomes a collaborator in the craftsmanship process. Through practical examples, we’ll explore how bounded contexts define API boundaries, how ubiquitous language shapes resource and event models, and how contract-first design enables safe, evolutionary change. By the end, you’ll see APIs not merely as integration points, but as living domain boundaries to align architecture, business, and shared understanding. **About the speaker** [Annegret](https://www.linkedin.com/in/dr-annegret-junker-141a99a4/) is Chief Software Architect at codecentric AG in Germany. She has worked in software development for over 30 years. She worked in quite different roles and domains. She is especially interested in DDD, microservices, and everything else. She is working on a large integration project and defines APIs for partners. **The Sponsor** This time, the location, food, and drinks are sponsored by [TechTalk](https://techtalk.at/). Thank you very much, TechTalk, you rock! 🎉 This will be a joined event with the Domain-Driven Design Vienna Meetup ([https://www.meetup.com/ddd-vienna/](https://www.meetup.com/ddd-vienna/)) and it is enough to register for only one of the meetups. It is not necessary to register for both! Space is limited, so please register if you want to come. As always, we're very much looking forward to seeing you! Best regards, Daniel and Gottfried

**IMPORTANT UPDATE:** Due to unexpected sick leaves within our speaker and organizing team, **we have to postpone this MeetUp to June 25th**. Everything else stays the same. **@everyone: Please review and update your RSVP status accordingly.** \-\-\- We'd like to invite you to our fourth installation for the Cloud Native Vienna MeetUps in 2026! Again we'll have two deep-dive talks and time to network and chat with friends in the Viennese cloud native community. A big thank you to **WKO Inhouse GmbH** for hosting us and providing food and drinks! **Agenda:** * **17:30:** Doors Open & Networking * **17:55:** Welcome from the Organizers * **18:00:** **Talk 1:** Rober Klonner (WKO Inhouse GmbH) **GitOps Visibility: Precise Argo CD diffs on every Pull Request** * **18:45:** Break & Refreshments * **19:00:** **Talk 2:** Thomas Hanser (Untis GmbH) **The Untis Platform Engineering Journey: GitOps Multi-Tenancy with Flux, GitLab, and Friends** * **19:45:** Open Networking We look forward to seeing you there! \-\-\- **Talks:** Rober Klonner (WKO Inhouse Gmbh) **GitOps Visibility: Precise Argo CD diffs on every Pull Request** Today's GitOps deployments are generated through layers of templating - Helm charts, Kustomize or ApplicationSets. Modifying these abstractions and trying to mentally render the output is error-prone. This talk introduces a method that uses Argo CD itself to render accurate diffs of Helm charts and Kustomize overlays between branches and posts the result directly on your pull request. We'll walk through a production setup using the Argo CD Operator, Argo CD Diff Preview, and GitLab CI, optimized for performance, minimal maintenance, and security. Through real-world use cases, we'll show what issues this approach catches before they hit your cluster. Thomas Hanser (Untis GmbH) **The Untis Platform Engineering Journey: GitOps Multi-Tenancy with Flux, GitLab, and Friends** Operating in the European education sector means juggling compliance, student privacy and massive traffic spikes when school starts. Historically at Untis, keeping this running in production was the burden of a single operations team. This session details our transition to an automated, multi-tenant GitOps platform managing a fleet of internal and external Kubernetes clusters. We share our approach of building a platform that gives product teams actual autonomy without compromising on security or control: * **Structured Multi-Tenancy:** Mapping GitLab groups to namespaced tenant projects using Flux’s multi-tenant model. * **Secure Access Control:** Leveraging the GitLab Agent for Kubernetes to enable scoped, declarative self-service cluster access. * **Flexible Delivery Models:** Supporting multiple decentralized deployment strategies by balancing governance and freedom for both internal teams and external guest environments. Prepare for an honest demonstration of challenges like managing secret lifecycles across a growing fleet, moving from script-driven tenant onboarding to true automated self-service, and wrestling with the classic "chicken-and-egg" problems of bootstrapping Flux and handling GitOps release management.

FlashAttention is one of the most important pieces of software infrastructure for both training and serving any relevant AI model on cutting-edge GPUs. Let's have a look under the hood. The paper comes with a blog post that may be easier to read: [https://tridao.me/blog/2024/flash3/](https://tridao.me/blog/2024/flash3/) Find the paper here: [https://arxiv.org/abs/2407.08608](https://arxiv.org/abs/2407.08608) We are trying out a new Location -- right at the Westbahnhof IKEA. Take the elevator to the fifth. We may relocate if it is too crowded. Please Text me if you are late and can't find us. \-\-\- Bring your own printout or pdf-on-a-gadget. If you didn't have the time to read the whole paper, it is sufficient to be able to pretend to have sort of skimmed it. \-\-\- Want to suggest a paper, an event location, or just stay in touch with regular members? We hang out at the following Matrix server: [https://matrix.to/#/%23pwl-wien:rend.al](https://matrix.to/#/%23pwl-wien:rend.al)

Bring your JS interest and a good vibe! Everybody is welcome & feel free to share this invitation! **Talks and info:** All details: [https://viennajs.org/en/meetup/vienna-js-june-2026](https://viennajs.org/en/meetup/vienna-js-june-2026) **Timetable:** * 18:00: Gathering, food & drinks * \~18:45 - 19:00: Start of the first talk **Talks:** \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- 🗣️ Ben Croker ▶️ Realtime Multiplayer with Datastar Great digital experiences are built on interactivity and collaboration. This talk demonstrates how Datastar can be used to build realtime, multiplayer experiences driven by the backend. \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- 🗣️ Frank Hellenkamp ▶️ Biological Evolution vs. Evolution of Programming Languages This talk compares biological evolution to the evolution of programming languages (e.g. JavaScript) and gives an overview of the evolutionary environment we all live and work in. It will be about genes, memes, Brainfuck, and more. \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- **🗣️Want to give a Talk?** ▶️ [https://viennajs.org/en/participate/give-a-talk](https://viennajs.org/en/participate/give-a-talk) **Location:** Sentry Jakov-Lind-Straße 5, 4. OG (Entrance next to Max & Benito) 1020 Wien **Sponsors:** 🙏 Sentry Sentry is the market leader in the error monitoring space and like many startups with engineer founders, Sentry was born out of frustration with technology. David started Sentry as an open-source side project in 2008. We started in a small community — the Django web framework — and over time expanded our technology to support dozens of other platforms, including browser JavaScript and mobile applications. Fast forward to today, we're a $90M Series E company with a $3B valuation and 200+ employees on a mission to help developers write better software faster, so we can get back to enjoying technology. As one can see, the adventure continues to be exciting as we bring our developer-first Application Monitoring to more customers and industries worldwide. Consider us for the ride! Link to Open Roles: [https://sentry.io/careers/#openings](https://sentry.io/careers/#openings) **🙏 Want to sponsor?** We are looking for more sponsors! If you are interested please contact us via [viennajsmeetup@gmail.com](http://viennajsmeetup@gmail.com/) or at [viennajs.org.](http://viennajs.org./) \*\*\* **Don't forget to RSVP!**

**Open Source Talks by OffOn x Dynatrace** **❗️Meetup is for discovery only. Don't rely on it for availability or capacity. The actual limit is 50 people.** **👉 RSVP on our website to confirm your spot: [RSVP HERE](https://community.offon.dev/t/open-source-talks-by-offon-x-dynatrace-june-25th/1579)** June 25, 2026 · Vienna Join us for the first Open Source Talks, a community-driven meetup for the Austrian open source community. Two speakers, a quiz, and networking with people from different OSS projects and communities. Open Source · Vendor Agnostic · Community Driven TALKS: * Drupal CMS by [Nico Grienauer](https://www.linkedin.com/in/grienauer/) and [Sinduri Guntupalli](https://www.linkedin.com/in/sinduri-guntupalli-307542131/) * Flip the Switch: Feature Flags and the Power of Open Standards by [Simon Schrottner ](https://schrottner.at/) \-\-\- AGENDA 17:30 — Doors open, networking (30 min) 18:00 — Welcome, OffOn.dev intro (10 min) 18:10 — Drupal CMS 2.0 by Nico Grienauer (25 min + 5 min Q&A) 18:40 — Break (15 min) 18:55 — Flip the Switch: Feature Flags and the Power of Open Standards by Simon Schrottner (25 min + 5 min Q&A) 19:25 — Open floor, networking (15 min) 19:40 — Open Source Quiz (15 min) 19:55 — Wrap-up, next event teaser (5 min) 20:00 — Networking ## SPEAKERS * [Nico Grienauer](https://www.linkedin.com/in/grienauer/): Drupal expert and Drupal Austria board member. Founder of acolono GmbH, CodeWeekEU ambassador, and initiator of Austrian Open Source Award. * [Sinduri Guntupalli](https://www.linkedin.com/in/sinduri-guntupalli-307542131/): Sr Developer Programs Engineer at Dynatrace. Experienced in product and program management, and web development. Passionate about open source with active involvement in the Drupal community. * [Simon Schrottner](https://schrottner.at/): OpenFeature maintainer and CNCF Ambassador. Helps teams release faster through open standards and feature flagging. \-\-\- **[LOCATION](https://maps.app.goo.gl/gziYEaS61aMbid6L7)** Dynatrace Austria GmbH THE ICON VIENNA · Tower 24 · 22nd Floor Wiedner Gürtel 13, 1100 Vienna Getting there: \- Ask for a visitor's card at the info point \(they'll direct you to the 22nd floor\) \- Hold your card against the reader at the second glass door \- At the turnstiles\, scan your card and note the elevator letter on the screen \- Take the elevator to floor 22 \-\-\- **❗️Meetup is for discovery only. Don't rely on it for availability or capacity. The actual limit is 50 people.** **👉 RSVP on our website to confirm your spot: [RSVP HERE](https://community.offon.dev/t/open-source-talks-by-offon-x-dynatrace-june-25th/1579)** Want to learn more about OffOn? [Visit our about page](https://offon.dev/about/) Questions? Email offondev@gmail.com

**Important note on RSVPs** To keep the breakfast format focused and useful, registrations are reviewed manually. Meetup may show the event as “full” because we are using the waitlist to manage confirmations. **Please still join the waitlist if you would like to attend.** We will review registrations and confirm participants individually. Thank you! **SNOWFLAKE & ACTIAN Breakfast at SPG** **How AI changes enterprise data search?** with **Ole Olesen-Bagneux** Join us for a breakfast meetup at the SPG office in Vienna together with Snowflake and Actian. O'Reilly Author Ole Olesen-Bagneux will share his perspective on how AI is changing enterprise data search, what this means for modern data platforms, and how organizations should think about metadata, context, governance, and usability in the AI era. We will also include a short **Snowflake update post-summit**, following the latest developments from the Snowflake Summit in San Francisco. Expect coffee, breakfast, good conversations, and a practical discussion for data leaders, architects, engineers, and everyone working on modern enterprise data platforms. **When** 25\. Juni 2026\, 08:30–11:00 **Where** SPG Office Hoher Markt 5 1010 Wien **Agenda** 08:30 – Arrival, breakfast & networking 09:00 – Welcome by SPG 09:15 – Actian: How AI changes enterprise data search? 10:00 – Snowflake: update post-summit 10:20 – Q&A and discussion 10:40 – Coffee, networking & wrap-up Looking forward to seeing you at SPG.

Most people still use AI like a search box: type one question, get one answer, repeat. But the next step is AI agents: systems that can take a goal, break it into steps, use tools, remember context, and produce useful work for a human to review. In this beginner-friendly session, we’ll demystify what AI agents actually are — without hype or jargon. We’ll walk through practical examples of how agents can help with research, planning, writing, coding, operations, and personal productivity. We’ll cover: * What makes an AI “agent” instead of just a chatbot * How agents break tasks into steps * Where agents are genuinely useful today * Where they fail, hallucinate, or need human review * How to design simple AI workflows for your own work * A live demo of an AI agent-style workflow from start to finish No coding experience required. This is for anyone who wants to understand where AI tools are going and how to use them more effectively right now. 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.

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)

**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** *Customize the IDE: Building Extensions for Visual Studio Code* Visual Studio Code is one of the most widely used development environments today, and much of its flexibility comes from its extension ecosystem. Extensions allow developers to customize the editor with new features, integrations, and workflow improvements tailored to their needs. In this session, we’ll cover what extensions are and the different types available, including full extensions written in TypeScript or JavaScript, along with lighter-weight extensions such as color themes, language packs, language support, code snippets, and keymaps. We’ll also look at practical reasons a developer might create an extension, from automating repetitive tasks to adding custom tooling. The session includes a hands-on walkthrough of creating a new extension, testing it locally, and understanding the basic project structure. We’ll close with a brief overview of how extensions are packaged and published to the Visual Studio Marketplace and other distribution options. **YouTube Link** TBD

**Improving Office in Franklinton** Physical location: Improving Office 330 Rush Alley Suite #150 Columbus, OH 43215 Schedule: 6:00 p.m.: Socialize, eat, and drink. Improving will be providing pizza and beverages. 6:30 to 8:00 pm. Main meeting and presentation(s). Topic: This month Chris Pazsint will be talking about Agentic Coding. How does one use CLI Based Agents, and Agentic IDEs such as Cursor, Kiro, Antigravity? How to include agentic coding plugins for IDEs you already love such as Visual Studio Code. We meet on the last Monday of each Month. Presentations are given by members and friends of this group. If you would like to do a presentation (small or large) on a python topic, please contact Central OH Python at centralohpython@gmail.com

These meetings will be a building block approach to learning photographic mastery over three disciplines: Mechanical Mastery (MM) - 13 weeks of the series Exposure Mastery (EM) - 26 weeks of the series Composition Mastery (CM) - A 52 week series All three series will run concurrently and will dovetail as follows: Q3/26 - MM (Iter 1), EM (Iter 1, Pt 1), CM (Iter 1, Pt1) Q4/26 - MM (Iter 2), EM (Iter 1, Pt 2), CM (Iter 1, Pt2) Q1/27 - MM (Iter 3), EM (Iter 2, Pt 1), CM (Iter 1, Pt3) Q2/27 - MM (Iter 4), EM (Iter 2, Pt 2), CM (Iter 1, Pt4) That's likely confusing, but essentially, MM offered 4 times in that period, EM offered 2 times, and CM offered 1 time. **TO BE CLEAR - THERE IS NO CHARGE FOR THESE CLASSES.** This is an aggressive series, with presentations, homework, group shoots to be added in, likely at LEAST twice a month, image critiques, and an expectation that you are willing to put in the work to elevate your photography significantly. Open to all levels and all equipment levels. Don't let hesitation about your skillset and/or gear keep you from a one-time opportunity. The group will meet every Monday, with periodic exceptions, and we will try to keep as close as possible to the original plan. Obviously, more data to come, and will be published as this is further developed, but now is the time to decide if you want to be a part of this.

Come chat about Atlassian tools and best practices at the Reynoldsburg Sunny Street Cafe and Breakfast is on Atlassian! Let's get the day started off with breakfast with your ACE Leaders! We're always excited to talk about Atlassian Products, share our knowledge and hand out swag! Come chat with us about new product news and anything you are working on within the Atlassian product stack. This is a great opportunity to come see what we are all about, hear new business news and share with other Atlassian users your questions and experiences. We'd love to see new and old friends come out to chat and learn about Atlassian! Agenda --- Moderators Kimberly Deal - Columbus Atlassian User Group Leader Kevin Stanley - Columbus Atlassian User Group Leader Greg Sprowls - Columbus Atlassian Community Leader Hosted By Kimberly Deal, Atlassian User Group Leader Kevin Stanley, Chief Everything Greg Sprowls, Agility Lead --- Global Partner Atlassian (http://atlassian.com) Millions of users globally rely on Atlassian products every day for improving software development, project management, collaboration, and code quality. Partner Atlassian --- For over a decade, Atlassian customers have come together to network, share ideas, solve problems, and find new ways to use Atlassian products. Today, more than 15,000 people take part in Atlassian community events in more than 30 countries. --- Complete your event RSVP here: https://ace.atlassian.com/events/details/atlassian-columbus-presents-rise-and-shine-with-atlassian-reynoldsburg-5/.

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