Extreme Programming

Please register here: https://hazelcast.com/resources/resilient-java-in-production-meetup/ ### Modern Java systems don’t fail all at once. They fail under load, during warmup, and sometimes days after a “successful” zero-downtime deployment. Join us for an evening focused on real-world resilience in production Java systems, from JVM performance stability to the hidden risks of mixed-version state during rolling upgrades. Come for the talks, stay for the conversations. Food, drinks, swag, and a LEGO® raffle included. ### **Special Guest: Simon Ritter** Java Champion and Deputy CTO at Azul, Simon Ritter shares how to make JVM performance more resilient by reducing latency risk from GC, warmup, and JIT behaviour without changing application code. ### **Hazelcast Session** Zero-downtime rolling upgrades in distributed Java systems are hard when multiple versions of the same service and data model must run concurrently and share state. Using Hazelcast and Hazelcast Compact Serialization, we’ll show practical Java examples and tests that demonstrate how mixed versions behave and how to make those upgrades resilient in real systems. ### **What’s in Store?** * Two technical talks on resilience in production Java systems * Food & drinks included * Swag + LEGO® raffle * Networking with the local Java community Please register here: https://hazelcast.com/resources/resilient-java-in-production-meetup/

Join us at SalsaTrain for a fun-filled evening of dancing and learning the art of salsa, suitable for all levels! SalsaTrain is in its 5th year now. All aboard! The SalsaTrain every Weds @ the Selhurst Railway Club in South London right by Selhurst Train station. Salsa classes every Weds night from 6.30-11pm. The classes are fun & interactive with Dominic Insta(Salsa_Legend) with over 20 years salsa experience, and Trish with 10 years teaching experience. Dominic's style is Predominately L.A. on 1/ cuban fusion. He was placed 1st in the Tropicana Tropics World Open Salsa Championship (Ama Division) 2003, has performed with a team of dancers at the 2005 UK salsa congress and placed as runner up in the European Open Salsa Championships (Cab 2007). He has also performed at the Scandinavian Salsa Congress 2009 in Sweden; as part of a team at one of the New York Salsa Congresses and instructed for many salsa promoters within the UK and Internationally. During lockdown, Dom launched his weekly music show "Sundown Salsa Live" on Mixcloud and has played regularly on OSSR radio every Friday 10am-12pm. Trish teaches the beginner class and has had experience teaching with another Salsa Group. All lessons (45 mins long) include party. No partner necessary. Free stop - 6.30-7pm Bachata Time (Music and Dance for 30 mins). There will be Bachata Tasters - (Beginners steps - 30 mins - Subject to change). 1st stop - 7-7.45pm Beginners & Improvers 2nd stop - 8-8.45pm Improvers plus level 3rd stop - 9-11pm - PartyTrain Social dancing Homeward Bound 11pm £10 for 1 class, £12.50 for 2 classes, £5 for party only. Early bird tickets for beginners Salsa class only for £8.50 & for 2 classes including party train for £10.00 inc Eventbrite fee available until 6.30pm each Tuesday - 24 hours before SalsaTrain. Boarding from 6.30pm. Get your tickets via [www.latindianevents.com](http://%5Bhttp://www.latindianevents.com%5D(http://www.latindianevents.com) "\[http://www.latindianevents.com\](http://www.latindianevents.com)") which leads to the following eventbrite link - [[https://salsa-train-selhurst.eventbrite.co.uk/](https://salsa-train-selhurst.eventbrite.co.uk/)]([https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsalsa-train-selhurst.eventbrite.co.uk%2F&data=05%7C02%7CA.Kapadia%40mdx.ac.uk%7Cfdc1b99d8569432c544008de4ebfb677%7C38e37b88a3a148cf9f056537427fed24%7C0%7C0%7C639034782480290305%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=bK7omfXlIt1Thr9F%2BZ4ZzCfdEWF9B27DChx7%2FsEcOIU%3D&reserved=0](https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsalsa-train-selhurst.eventbrite.co.uk%2F&data=05%7C02%7CA.Kapadia%40mdx.ac.uk%7Cfdc1b99d8569432c544008de4ebfb677%7C38e37b88a3a148cf9f056537427fed24%7C0%7C0%7C639034782480290305%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=bK7omfXlIt1Thr9F%2BZ4ZzCfdEWF9B27DChx7%2FsEcOIU%3D&reserved=0) "[https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsalsa-train-selhurst.eventbrite.co.uk%2F&data=05%7C02%7CA.Kapadia%40mdx.ac.uk%7Cfdc1b99d8569432c544008de4ebfb677%7C38e37b88a3a148cf9f056537427fed24%7C0%7C0%7C639034782480290305%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=bK7omfXlIt1Thr9F%2BZ4ZzCfdEWF9B27DChx7%2FsEcOIU%3D&reserved=0](https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsalsa-train-selhurst.eventbrite.co.uk%2F&data=05%7C02%7CA.Kapadia%40mdx.ac.uk%7Cfdc1b99d8569432c544008de4ebfb677%7C38e37b88a3a148cf9f056537427fed24%7C0%7C0%7C639034782480290305%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=bK7omfXlIt1Thr9F%2BZ4ZzCfdEWF9B27DChx7%2FsEcOIU%3D&reserved=0)") (WE ALSO ACCEPT PAYMENT BY CARD ON THE NIGHT) You will be refunded or have your ticket transferred to another night providing you inform either of the contacts below by 7pm on the day you are coming. More info please contact Abs 07507634241 or Dom 07939587944 Venue details and information. Selhurst Railway Club is a stones throw from Selhurst train station - well connected by London Victoria, Clapham Junction and East Croydon. Upon arrival please press the buzzer and wait to be let in. You will need to show your pre paid ticket on your phone & asked to give your details to the club management. You will then be escorted into the room to board the SalsaTrain. The venue has a fully stocked bar at extremely reasonable prices & crisps, nuts. It is a very spacious venue and has a very comfortable feel with great wooden floor for dancing. All aboard!!!!

## Details Welcome to the DevSecOps London Gathering March Event on Wednesday 26 March. We bring you two amazing talks, as well as the usual conversations, pizza and beer! 📍 **Hosted at Autogen AI, Pentonville Road, London** 📅 **Wednesday, 26 March** 🕕 **6:00–8:00 PM** ## Talk 1 **Abstract:** Software supply chain attacks are no longer rare or theoretical. They are happening every day. Recent ​ incidents show how easily malicious packages can enter trusted registries and make their way into production systems before anyone notices. Today’s package managers host millions of components and support billions of downloads each week. That scale enables modern software development, but it also creates an enormous attack surface. Typosquatting, dependency confusion, malicious install scripts, and credential harvesting are no longer unusual techniques. They are now common and repeatable attack patterns. This session looks at how these attacks are playing out. Using malicious code detection data from Veracode, we walk-through real-world supply chain attack campaigns, the techniques attackers use, and the indicators that separate legitimate open-source packages from malicious ones. Attendees will see how weaponized components are identified, sometimes before they reach production and sometimes after damage has already begun. The talk also draws on industry research, including findings from the Veracode State of Software Security report, to put hard numbers behind the risk introduced by open-source dependencies and transitive trust. The session concludes with practical guidance for reducing exposure without slowing development. Topics include dependency controls, CI CD enforcement, malicious code detection, and continuous monitoring approaches that fit modern engineering workflows. ## Talk 2 **Abstract** [The National Archives](https://www.nationalarchives.gov.uk/ "https://www.nationalarchives.gov.uk/") is the official archive and publisher for the UK Government. Our records include physical records such as the Domesday Book and Magna Carta, along with digital records from UK Government departments, Enquiries, and other public bodies, held both on premise and in public cloud. It's vitally important to protect our digital records from accidental deletion and the increasing threat of ransomware. We therefore initiated a programme to implement immutable cloud backups using the AWS Backup service within a central, segregated AWS account. In this talk, we'll share our learnings from this programme of work, including: * why AWS Backup compliance mode vault locks are not always truly immutable * which KMS key types should be selected to support backup and restore to a central vault * the importance of Logically Air Gapped (LAG) vaults * how each AWS service has implemented backups differently * which widely used AWS database option doesn't support centralised backup * cost considerations for setting up backup plans We soon learnt that it's not just a case of "Turn on AWS Backup". To deploy a centralised solution, we needed to: * configure centralised AWS Backup vaults and vault policies * deploy components to workload accounts, including Backup vaults, EventBridge, IAM roles * select the appropriate vault type depending on AWS resource type We decided to implement our solution as an open-source, public Terraform Module which deploys immutable AWS Backups across an AWS Organization, to handle this complexity, and simplify onboarding new accounts and resources to be backed up. You'll come away with an increased understanding of AWS Backup, an appreciation of its complexity and limitations, and the opportunity to greatly simplify deployment of truly immutable backups across your AWS accounts, using our public Terraform module.

Join us for fun drama games and improv. No experience required. Book here or www.actorverse.co.uk

**Looking for a business networking event in London?** Join us in the City of London to **connect with startup founders, tech entrepreneurs, and professionals in business, finance & tech**. Event by tech startup **GMax Card** and **Getshop Today**. **🤝 Meet and Connect with:** * Startup founders & entrepreneurs * IT, tech & product professionals * Business owners & consultants * Finance, banking & investment specialists * International professionals based in London **🎯 Why Attend?** * Meet founders, entrepreneurs, tech pros, FinTech operators * Build valuable business and startup connections * Discover new ideas, trends and opportunities * Real conversations in a mid-sized group - not a crowded conference (max 40 people) * Paid ticket holders get a free GMax contactless business card **💼 Note re contactless cards** Free RSVP includes event access only. [Contactless GMax Cards](http://www.gmaxcard.com/shop) are included with paid tickets (when available). **📍 Venue: The Otherist, City of London** In the City of London, The Otherist offers a refined but welcoming space for professional networking. With sleek, contemporary design, comfortable seating, and a calm atmosphere away from large crowds, it provides the right balance for thoughtful business and tech conversations in a central location. 👔 **Dress Code:** Business / smart. This is a business networking event rather than a fully informal gathering. **📅 Agenda** 18:30 – 21:30 Informal business networking in the City of London. On arrival, please ask the receptionist about the networking event. Hosts can make introductions if necessary, followed by open, informal networking. ⚙️ **Co-organised by tech startups:** * [GMax Card - Digital and contactless business cards](http://www.gmaxcard.com/) designed for modern networking, plus easy landline setup for your new business. * [Ciitab - AI-powered LinkedIn networking tool](http://www.ciitab.com/) to help you build and nurture professional connections at scale. * [Getshop Today - Create your own independent online store on a UK-built platform](http://www.getshop.today/), so you’re not dependent solely on global marketplaces like Amazon or eBay. ⚠️ **Important Details:** * Age & ID: 18+. ID may be required for alcohol purchases. * Photos & Video: Filming and photography by [CineEye - video production and commercial photography in London](http://www.cineeye.co.uk/). Images may be used for promotion - inform organisers on arrival if you do not consent. * Dress Code: Business/Smart. Please see above for more info. * Liability: Attendance is at your own risk. Organisers and venue accept no responsibility for loss, injury, or damage to you or your property. 🎟️ **Register Early - Only 40 Spots!** Register now and don't forget to join this Meetup group.

In-person and online - this is the **March 2026 London Webflow Meetup**! New to Webflow, experienced, freelance, in-house, or just curious, everyone is welcome. Curious what it’s like? [Watch the one-minute teaser](https://www.youtube.com/watch?v=M_eZDWFEuDU). ️🕰️ **SCHEDULE** **6.15pm:** drinks + mingle **6.30pm**: welcome and announcements. **6.45pm:** presentations **1️⃣ [Hamish Duncan](https://www.linkedin.com/in/hamishduncan/) \- Build at the Speed of Thought** In this talk, Hamish shares ***why design systems are now the product***, how coherent structure turns speed into an advantage rather than a risk, and what it takes to build workflows that move at the speed of thought. [Hamish Duncan](https://www.linkedin.com/in/hamishduncan/) is the founder of [HUX](https://hux.works/), a design systems partner that works with agencies and product teams to build coherence across people, tools and workflow. A former professional snowboarder turned systems thinker, Hamish brings 16+ years of experience helping teams move from guesswork to clarity — building design systems structured enough for AI tools to act on, and human enough to feel right. 2️⃣ **[Stefan Velikov](https://www.linkedin.com/in/aboutstefan/) \- What Happens After 25\+ Locales in Webflow: Lessons Learned** When you make a Webflow site available worldwide, issues come up that you wouldn’t get with a smaller site. In his presentation, Stefan talks about what he’s learned from ***a Webflow project that had to work in over 25 different locales***. He’ll explain the technical and structural problems you run into when a site gets that big, covering how the CMS is set up, how to get your site translated and adapted for each region, what to think about when using components, and how to ensure everything looks and feels the same in each country, all while allowing marketing groups to update things quickly. [Stefan Velikov](https://www.linkedin.com/in/aboutstefan/) is a Webflow Premium Partner and the person behind [Agota Studio](https://agota.studio/). He builds fast marketing websites in Webflow for both new companies and big businesses all over Europe, North America and Australia. He frequently works on complex Webflow builds involving large CMS architectures, multilingual site setups, and custom integrations that allow marketing teams to scale their website **8.00pm**: social at a local pub **🌍 LOCATION** Beyond, Level 2, **The Bower Building**, 207 Old St, London EC1V 9NR Main building entrance closes at 7pm! 1 minute walk from Old Street tube station. Take the MAIN tube station exit. Entrance to The Bower building is down a side street next to the Wagamama restaurant. **📺 LIVE STREAM** Can't make it in person? Then tune into our new live stream. [https://youtube.com/live/0r1wq2KGG7o](https://youtube.com/live/0r1wq2KGG7o) and make sure you hit the **Notify Me** bell! **✍️ MEDIA RELEASE** ​By attending, you understand and accept that portions of the event may have audio/photo/video-recorded and/or live-streamed and may be used by the organisers. You agree that the organisers have the right and permission to use and publish such media for any purpose in any format, including online and offline, now and ever after, without further compensation, permission, or notification. You understand that all official recordings from the event are the exclusive property of the organisers, available under the Creative Commons Attribution­ShareAlike license for general use, and you do not ask for nor expect compensation or notification of the use of official recordings or photographs in which you appear or speak. Please inform an organisational team member at the event's start if you do not wish to appear in photos or videos. ✊ **CODE OF CONDUCT** Finally, in attending this event you are agreeing to the [Webflow Community Code of Conduct](https://webflow.com/community/code-of-conduct).

**Let's Shoot Noir Street Photography in Soho London After Dark** This mini-workshop event focuses on shooting street photography after dark. You will learn tips for low-light shooting, handheld techniques, and how to creatively use existing city lighting. Soho after dark has a completely different energy. Neon signage, theatre lights, and passing traffic create natural contrast, cinematic tones, and deep, moody shadows. The location itself becomes part of your frame, adding atmosphere without the need for a flash. This session focuses on capturing moody, neon-lit street photography using the city’s existing lights. You’ll learn to see, interpret, and use the available light creatively. Occasionally, a model will be present as a point of focus to help you practice shooting subjects in various real-world night-light conditions. *** **What You Will Learn** * **Reading Available Light:** Observe neon signage, street lamps, traffic, and reflections and use them creatively in your shots. * **Handheld Night Shooting:** Adjust ISO, shutter speed, and aperture for sharp, well-exposed images while shooting handheld. * **Creative Use of Light on Subjects:** Learn how to make people stand out using the available neon and street lighting. * **Exposure and Mood Control:** Balance highlights, shadows, and neon to capture the “noir” atmosphere. * **Quick Observation & Reaction:** Train your eye to spot photo opportunities in challenging night conditions. * **Getting to Know Your Kit:** Understand what your camera and lenses can do in low light so you can react confidently. *** **What to Bring** * **Camera Kit:** A fast lens (prime or zoom, around 35–50mm, f/1.4–f/2.8) is highly recommended for best results at night. You may bring your best lens for practice, but you may struggle more in lower-lit situations. Message me if you want advice on gear before booking. * **Essentials:** Cleared memory card and fully charged batteries. Extra batteries recommended. * **Travel Light:** Comfortable shoes and clothing suited to the weather. *** **Event Info** * **Duration:** 2 hours * **Group Size:** Max 5 * **Meeting Location:** Soho, London *** **Bonus for Members** * **FREE DOWNLOAD – Beginner Street Photography Tip Sheets:** Master Night Street Photography For Beginners Tip Sheet covering the key topics from this event. You will receive a download link to follow along during the session. * **FACEBOOK COMMUNITY GROUP:** A private group for Meetup members to showcase their best work, receive critique, advice, and tips.

**——————————** **Event Description:** **——————————** Welcome product enthusiasts! We're a meet-up group that hosts regular speaking events for those interested in the world of **digital products** and **doing things differently!** Each meet-up features new guests from some of the most influential product companies around the world, providing unique insights, tangible ideas, and new techniques to help drive change from the inside out. **————————** **Event Format:** **————————** This is a **hybrid** event, offering the option to come along in person or join us from anywhere in the world online! **————** **Venue:** **————** 🚨 We are at Wrap co-working Brighton, a stone's throw from the station. We're looking forward to seeing you there! 🚨 **————————** **Our Supporters:** **————————** Our March event is supported by **[MPB](https://www.mpb.com/en-uk)** the world’s leading platform for buying, selling and trading used photography and videography equipment, making kit more accessible and sustainable for creators everywhere. And as always our friends at **[Silicon Brighton](https://siliconbrighton.com/)**, whose mission is to put Brighton on the map as a technology hub, spotlighting the region for talent and investment. **————————** **Our speakers:** **————————** **Steve Down** **Steve Down is a Senior Product Manager at Channel 4, specialising in building high performing streaming apps for the biggest screen in the home.** He’s spent years shaping TV experiences at major UK broadcasters, tackling platform fragmentation, performance constraints and all the quirks that make doing product on TV Apps a whole world of its own. He regularly writes and speaks about the realities of Connected TV product development, sharing lessons from building and scaling TV apps across diverse platforms and fast changing user behaviours. His industry contributions unpack everything from platform limitations and UX challenges to experimentation gaps and the future of big screen viewing. **————————** **About the Talk:** **————————** **Behind the Streams: The untold story of TV App Product Management** Forget what you know about doing Product Management on web and mobile - TV is a whole different ball game. You’re juggling dozens of platforms & stakeholders, designing for a lean-back user experience, and working in an environment where optimal performance is everything. Add in the giants like Netflix, Disney+, and YouTube as competitors, and standing out gets tough. **In this session, Steve will pull back the curtain on:** \- What makes TV product management so different \- The skills you need to succeed in streaming \- How you can break into one of the most exciting areas in product today If you’ve ever thought about working in streaming or just want to know what happens behind the biggest screen in the house, this talk is for you. **Raff Di Meo** Senior Product Design Manager at Optimizely. Raff has spent over 10 years designing products across startups, agencies, and enterprise SaaS, including a startup acquisition. Today, he's a Senior Product Design Manager at Optimizely, where he leads a team of designers reshaping how marketing teams create content across the web. He's an active speaker in the UX community and writes Some Designers on Substack, championing inclusivity and supporting designers through a profession that won't sit still. **————————** **About the Talk:** **————————** **When too easy to use becomes a problem: from e-commerce returns to AI in design** A few years ago, Raff designed a returns flow for an e-commerce product. It was fast, frictionless, and users loved it. It also helped normalise a behaviour that cost businesses millions and generated thousands of tonnes of waste. By every metric tracked, it was a success. By every metric not tracked, it was a disaster. Today, the same pattern is playing out. Not just in the products we design, but in how we design them. Teams are reshaping their entire process around AI tools that can't even retain their own users. We're told the old ways are dead. Move faster. Ship more. Trust the tools. In this talk, Raff will share what the returns project taught him about the gap between a successful design and a responsible one, and how those lessons are shaping how his team is navigating AI right now: what they're using, what's genuinely working, and what they're deliberately protecting. You'll leave with three things you can take back to your team: why understanding the problem still comes first, how to explore with AI without losing your craft, and a dead-simple habit for catching unintended consequences before they ship. **——————————** **About your hosts:** **——————————** Product Unleashed is brought to you by your hosts **[John Griffin](https://www.linkedin.com/in/john-griffin-designer/)** and **[Dominic Port](https://www.linkedin.com/in/dominic-port/)**. The duo have worked on the design of products of all shapes and sizes and bring their energy and enthusiasm to this unique meetup, packed with great guests and knowledge - for anyone interested in levelling up their game in the world of products.

Retrieval-Augmented Generation (RAG) is the gold standard for grounding LLMs in proprietary enterprise data. However, the journey from a flashy proof-of-concept to a reliable, secure production system is fraught with complexity. This talk bridges the gap between rapid prototyping and rigorous engineering. We will begin by exploring the actual merit of “vibe-coding”—using AI-assisted, rapid prototyping to build compelling demo apps that secure client buy-in and validate use cases. Once the demo is sold, the real work begins. We will navigate the architectural decision matrix, comparing the trade-offs of off-the-shelf products, cloud-managed services, and fully custom-built RAG solutions. Diving into the technical pipeline, we will cover modern ingestion strategies like agentic chunking and sophisticated retrieval methods, including re-ranking and GraphRAG, to overcome the limitations of simple vector search. We will detail the essential role of telemetry and LLM-as-a-Judge evaluation frameworks in ensuring sustained performance, faithfulness, and relevancy. Join us to learn how to transition from impressive demos to robust solutions that deliver measurable business value. Our Speaker, **[Dr. Enrico Fonda](https://www.linkedin.com/in/enricofonda/)** is a data scientist with a background in physics. He conducted postdoctoral research at the University of Maryland and New York University, where he studied quantum fluids and applied deep learning to turbulence. In 2019, Enrico moved to London and transitioned his skills to the industry. He has since worked across the MarTech, Telco, and Tech sectors, focusing on machine learning modeling, generative AI applications, and code generation. Today, as a Solution Consultant at Sahaj Software, he continues to solve complex problems in data science and AI. 🗓️ **Save the Date:** 26th March, 2026 📍 **Location:** Sahaj Software, 1 Quality Court, London, WC2A 1HR 🕕 **Time:** 6:00 PM – 8:00 PM (BST) The evening will feature: 🎤 **One engaging talk** with Q&A 🤝 **Plenty of time for networking** over free pizza and non-alcoholic drinks Don’t miss this chance to learn, connect, and share with fellow tech enthusiasts. 👉 Please click the link below to register. https://sahaj.ai/events/the-rag-reality-check-from-vibe-coding-to-production/

**About** THE CASTLE CLIMBING CENTER has about 135 roped/auto-belays numbered routes with each route having up to 6 grades giving it approx 700 routes in total. THE CASTLE CLIMBING CENTER offers bouldering, top-roping, leading and auto-belays at their center. Some of us prefer bouldering while others will be in the top roping, leading or auto-belaying - this is up to you! We climb for a couple of hours and then the group regroups at 12.00 noon sometimes without me other times with me in The Brownswood pub, 271 Green Lanes, Finsbury Park, London N4 2EX for a spot of lunch and a libation. (https://goo.gl/maps/S4FZ9j1AYMPDs7uQ6) a stone's throw from the castle. **Meetups** We get together every Thursday & Sunday at THE CASTLE CLIMBING CENTER meeting at 9:00am in the warming up area or else look out for someone wearing a black RAMS t-shirt around the center. If you're joining for the first time let us know via message and we will keep an eye out for you at the start :) **New Climbers!** Unfortunately, if you haven't climbed before it isn't as easy as just turning up and climbing up the wall. To climb safely you need to understand the hazards and be able to use the equipment correctly. You must have basic climbing skills and know how to put on a harness, attach a rope to a harness using a rethreaded figure of eight(figure of eight on the bight) and know how to use a belay device to pay out the rope and secure a falling climber etc. So before your first climb, you may be required by the climbing center to fill out health and safety forms. This may involve a quick test on climbing rules at the counter on arrival. Please add an extra 10/15 minutes before your session if you need to register for the first time. THE CASTLE CLIMBING CENTER terms and conditions will apply. Please also note signing up for the Meetup session won’t necessarily grant you access to the center. **Other communication** Within these groups, you are possibly likely to develop long-lasting friendships. Don't forget we have a Discord page and WhatsApp https://chat.whatsapp.com/JNJ81oLSKB2JGaNm79em0C. The group will always be very varied when it comes to climbing levels, abilities and modality preferences. Do shout out if you have any questions. If you want to have a chat about this or other meetups, or just to keep in touch, ask to join us on Discord and/or WhatsApp. We have a dedicated THE CASTLE CLIMBING CENTER chat, but also talk about all things climbing (and some non-climbing!) including trips, gear talks and looking for climbing partner/s situations. **You’ll Rock it** A word of warning this sport is very, very addictive once bitten your its mistress for life. The simple challenge of you against the rock is sublime, there are competitions but then really the only real competition is 'you and the rock'. As climbing can be a very social activity we look forward to sharing our passion with yours. *Happy climbing!* p.s. Eventually, we will be starting and incorporating our climbing academy where we aim to bring skills, ropework and technique etc to enhance your climbing ability, using 25mm chalk bag colored belts to indicate your level. Naturally, THE CASTLE CLIMBING CENTER will also run courses to help improve your techniques too. Contact THE CASTLE CLIMBING CENTER for more info.

**About the London Software Guild** ​The London Software Guild gathers developers, architects, and teams across London who care deeply about the craft of building great software. No fluff, no vendor pitches — just people who take the work seriously, sharing what they've learned the hard way. *** ## ​**Tonight's Speakers** ## ​**🎤 Kieran — Founding Engineer, Demand-Genius** ​Kieran is a founding engineer at Demand-Genius, working to close the gap between how humans and machines perceive your brand versus reality. Background in electrical & electronic engineering, previously working on real-time payments systems, high-scale distributed dynamic rules engines, and reverse proxies. Third Start-Up/Scale-Up (because I'm dumb and have never learnt my lesson). ​ **Talk: The Statistical (Un)Certainty That Our AI Co-Founder Ruins Everything** ​We have handed the most powerful text prediction machines ever built the keys to our codebases. They write code that is statistically likely to be correct. But "statistically likely" and "correct" are not the same thing. As we move toward autonomous multi-agent systems writing production code at machine speed, that gap becomes the central engineering problem of our time. ​Code is not text. It is a formal, deterministic, mathematical structure that happens to be serialised as text. Every tool in the agentic coding stack — retrieval, editing, version control, coordination — treats it as text. ​This talk argues that the answer isn't better frontier models. It's better systems around models. Specifically, the engineering disciplines we've used for a century to control uncertain systems — feedback loops, formal verification, dependency analysis, and control theory — are the missing layer between "AI can write code" and "AI can write code you can trust." *** ## ​**🎤 Andy Roberts — Senior Engineering Leader** ​Andy Roberts is a senior engineering leader with 25+ years of experience — the kind where you've actually written the code, run the teams, and been in the room when things went wrong at scale. Previously Head of EMEA Enterprise Solutions at Apollo GraphQL, where he helped companies like [Booking.com](https://booking.com/), PayPal, and The New York Times stop arguing about their APIs. Before that, Head of API Engineering at RS Components, wrangling 11 teams. Has strong opinions about federated architecture and isn't afraid to use them. ​ **Talk: Built for Browsers, Billed by Tokens** *Your microservices solved for latency. AI agents are solving for context. Nobody told your APIs.* ​Every era of software development has been defined by a constraint that reshaped architecture. In the database era we optimised for round trips. In the web era we obsessed over latency. Mobile forced us to think about bandwidth and battery. Each shift required new instincts, new patterns, new defaults. We're in the middle of another one. ​The AI era introduces a new constraint: context. Language models have finite working memory, and every API response your services return goes into it. The kitchen-sink response payloads that work fine for browsers are quietly making your AI agents more expensive and less capable — and the cost is almost entirely invisible in your existing dashboards. ​This talk maps the constraint transition from latency to context, shows what it means for the microservice APIs you have today, and offers five concrete things you can do about it without touching a line of existing backend code.

Hi Architects, Welcome to our the second AWS London Well-Architected User Group Meetup!!! 🥳🥳🥳 Due to the huge demand we saw for our inaugural meetup we have gone bigger with a new venue. Dragon Hall Trust, 17 Stukeley Street, London WC2B 5LT The AWS London Well-Architected Meetup is the latest chapter in the most popular AWS Meetup group globally. At each meetup we cover off various pillars of AWS best-practice in detail including insights from industry leaders that specialise in the Well-Architected Framework. We'll be announcing more speakers and topics over the coming weeks. **Speakers** * **The Philosophy Behind Well-Architected** **Philip Fitzsimons (Fitz)** \- Ex\-AWS \- Co\-authored the AWS Well\-Architected Framework\. The Well-Architected Framework started at AWS but has since been adopted by every major cloud vendor and beyond. Why did it resonate so widely? In this session, Fitz, who led the Well-Architected initiative at AWS from the beginning, explores the philosophy behind the framework, how it was intended to shape architectural thinking, and the mistakes teams commonly make when applying it. Drawing on lessons from seeing thousands of real architectures, he will explain how to approach Well-Architected reviews in a way that actually improves systems rather than just generating checklists. * **Running your first Well-Architected Review: A Live Walkthrough** **James Harding** \- Technical CSM \- Green Custard Curious about how a Well-Architected Review works in practice? In this session we'll run a live walkthrough using the AWS Well-Architected Tool, showing how to define a workload, answer the review questions, identify High Risk Issues and move on to an actionable improvement plan. * **Building Your Infrastructure: "Self-Hosted vs. Managed"** **Mykola Boiko -** Backend Developer - Ultralytics What does it really cost to build and operate your own infrastructure? Mykola Boiko shares real-world lessons from scaling a globally distributed AI platform using self-hosted infrastructure before gradually migrating services to AWS. Through stories of building replication, caching, observability, and multi-region reliability from scratch, the session reveals the hidden operational complexity and costs behind running everything yourself. The journey highlights key principles of the AWS Well-Architected Framework including Reliability, Performance Efficiency, Operational Excellence, and Cost Optimisation and shows why managed cloud services can dramatically reduce operational burden while improving scalability and resilience. More speakers to be announced soon. So come join us at 7pm for a 7.30pm start, including drinks, snacks and friendly networking after our talks :-) \*\*\*NB: No entry to the building after 7.30pm.\*\*\*

**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 **Abstract** Web Forms gave .NET developers a powerful abstraction for building reusable UI controls long before design systems were a thing. Web Components finally bring that same idea to the browser natively. This session explores how the Web Forms mindset translates into Custom Elements, Shadow DOM, and HTML templates. We’ll examine how Web Components enable design systems that work across frameworks, how they differ from server‑driven controls, and why they’re becoming a foundational layer for modern UI. Whether you’re maintaining legacy apps or building greenfield projects, you’ll leave with a practical understanding of how to apply familiar patterns in a modern, standards‑based way. **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

Builders, creators, architects, admins, consultants - come one, come all. This one's for you. We're bringing a little friendly competition to the Columbus ServiceNow community while highlighting the cool things people have built on the platform. Five presenters will take the stage to showcase something they've built, solved, designed, or imagined on the ServiceNow platform - and a panel of judges (plus YOU, our amazing audience) will score them live. So basically, America's Got Talent but make it ServiceNow's Got Talent. Bring a notepad if you'd like 'cause you'll definitely be learning something new. Each presenter gets 10 minutes max to wow the crowd with: • A demo • A real-world business solution • A bold idea • A UX transformation • Or a creative use of the platform Judging Criteria: 🏆 Business Value 🚀 Innovation ✨ User Experience This event is about celebrating ideas, sharing knowledge, and showing how ServiceNow can drive both business impact and meaningful user value. Come learn. Come support. Come get inspired. Refreshments and bites will be provided. And maybe next time… you’ll be on stage.

We connect you with up to 30 Men or Women tennis partners close to your PLAYING REGION and skill level. This program is less competitive, no champions crowned, no league standings just dedicated tennis partners who want to meet up with you on the courts. Players will meet up to play a tennis match or just to hit around. Just go through the [Join Page](https://www.tenniscolumbus.com/partner-program) to enter this program. [https://www.tenniscolumbus.com/partner-program](https://www.tenniscolumbus.com/partner-program)

Come chat about Atlassian tools and best practices at the Nationwide 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 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-downtownnationwide-22/.

**How to take control of your subconscious and harness its power!** Join us for an eye-opening lecture where the speaker will break down complex ideas in a clear and practical way. You’ll gain insights into: ✅ The true definition of the subconscious ✅ How it generates unwanted emotions ✅ Its real purpose and function ✅ What determines the pressure it exerts on you And the most important topic: **How do you take control of your subconscious!** But this isn’t just another lecture where you sit and listen passively. It’s interactive and engaging—you can ask questions at any time. 📅 Reserve your spot now! Seats are limited, so don’t wait too long to sign up. Location: 1266 Dublin Rd, Columbus, OH 43215 Hosted by the Hubbard Dianetics Foundation

**New Dojo Location!** **Knotty Pine Brewing** 1765 W 3rd Ave, Columbus, OH 43212 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)