Hadoop

Happy 2026! Our first meetup of the year will be back at Zühlke's offices near Old Street, with Guillaume Faas talking about better ways to handle exceptions, Jenny Martin talking about taming complexity with OOPSI, plus the usual drinks, snacks, and plenty of time to chat. Doors 18:30, the first talk starts at 19:00 and we'll be done and heading to the pub at 21:00 to continue the conversation. **Guillaume Faas: Throw exceptions... out of your codebase** Throwing exceptions is often used to handle errors, validations, and other specific use cases. It is considered by many to be the standard way of indicating a failure and providing feedback to the caller. However, this approach can cause significant issues like being hard to detect, obfuscating the flow or leaving the system invalid. In this talk, I want to show you a faster alternative that offers more transparency and predictability. We will see how to integrate ideas from the Functional paradigm, such as "Monads", into an Object-Oriented codebase using a real-life project: Vonage's open-source .NET SDK. This talk will be the perfect opportunity to show you what they are and how easy they are to use. **Guillaume Faas** is a Senior .Net Developer Advocate at Vonage, based in Thionville, France. In recent years, Guillaume has focused on sharing my experience through mentoring, public speaking, and open-source contributions; all aimed at helping teams grow and build sustainable software. With nearly 15 years of experience in .NET development, he's worked across industries as an engineer, coach, and now developer advocate. His current focus is on developer experience: building SDKs, writing approachable technical content, and speaking at conferences around the world. **Jenny Martin: OOPSI: Making Sense of Complexity** OOPSI stands for outcomes, outputs, process, scenarios, inputs. It’s a flexible, easy-to-use collaboration framework that helps agile and product development teams cut through complexity and focus on value. OOPSI is timely because it maximises the intrinsically human aspects of effective delivery, helping teams understand how and when to collaborate, while producing lean, example-driven artefacts that clarify scope and intent so both people and automation can work more effectively. In this talk, you’ll learn how to apply OOPSI to strengthen shared understanding, clarify assumptions, and support testable delivery, using a detailed, end-to-end example. **Jenny Martin** is a practitioner, facilitator, and product discovery specialist with over 25 years’ experience working at the intersection of technology, delivery, and human behaviour. She has spent more than 15 years working with Agile and modern product development teams, helping them make sense of complexity and build shared understanding. Known as The Collaboration Coach, Jenny focuses on practical collaboration that supports effective delivery. She is currently writing a book on OOPSI.

**Address: 210-212 Southwark Park Road, London SE16 3RX** **Doors Open 11am Event starts 6:30pm-10pm** **Player Capacity: 12 players** Welcome to our **Shadowverse TCG** Constructed Tournament. The evening consists of 3 to 5 rounds of Swiss and prizing is distributed to players with a positive record. To participate in the event, alongside your **ticket purchase on our [website](https://www.thebrotherhoodgames.co.uk/shadowverse-evolve-events)**, you will be asked to register on the Bushinavi app. We use this app for our tournament. We will hand out a promo pack for the tournament. If you are unfamiliar, please ask our member of staff upon arrival to the store where a member of staff will be happy to assist. If you haven't already, please join our Instagram, YouTube and Discord Server for news about upcoming events, announcements, and social interaction with your fellow players! *The Brotherhood Games Discord* https://discord.com/invite/SJaQXyeNXx

**This event is open to current university students only. Unfortunately, non-students will not be admitted. Thank you for your understanding.** Join **AWS Cloud Club** for an exclusive deep dive with **Viola Harperath**, Software Engineer at **Trainline**! We’re peeling back the curtain on how one of the world’s leading travel platforms leverages AWS to power seamless travel for millions. Whether you’re interested in cloud architecture, the current tech industry outlook, or just want to hear from someone crushing it in the field, this is for you. * **When:** Tuesday\, Feb 24th \| 6 PM \- 7 PM * **Where:** Clerkenwell Campus (Exact room TBA on the day!) * **Bonus:** We’ve got **AWS Cloud Club Merchandise**! Don't miss out on the chance to network and level up your cloud knowledge. See you there!

The London Mountaineering Club's weekly club night at Westway takes place every Tuesday. There will be many more of us at the wall than listed on this event. To find us, look for people wearing an LMC T-shirt. This is a friendly meetup for competent climbers (at all levels of aspiration) to find people to climb with. If you have not climbed at Westway before, you will need to pass Westway's safety test before you can climb unsupervised. If you are unsure whether the centre will allow you to climb unsupervised please message the event organiser on Meetup in advance. We may be able to arrange supervision for you to climb without passing the test but this depends on club members being available to supervise and places will be limited. The London Mountaineering Club does not charge for this event but you will need to pay the entry fee to Westway and for any gear hired. Details of the Westway climbing wall are available on the [Everyone Active website](https://www.everyoneactive.com/centre/westway-sports-fitness-centre/climbing/) including [prices](https://www.everyoneactive.com/centre/westway-sports-fitness-centre/?activitySearch=casual%20climb).

*Code Green London is an independently organised Green Software meetup sponsored by the Green Software Foundation.* Please join us for the latest Code Green London x Climate Action Tech meetup, sponsored by the Green Software Foundation! Code Green London is a community meetup group which aims to build the biggest green tech community in London. Join us on the 24th to learn about the latest in green software and network with London’s fantastic green tech community. Our event is designed to foster meaningful connections and collaborations that can lead to further developments in green tech and new partnerships between innovators in the field. Whether you're a seasoned green tech professional, an entrepreneur looking to launch a new venture, or simply interested in learning more about the latest developments in sustainability and technology, this is the place to be. ** The timings:** * 6:30 pm - 7:00 pm: Drinks & food * 7:00 pm - 8:30 pm: Talks + Q&A * 8:30 pm - 9 pm: Networking ** The talks** * **Lee Cameron, VP of Product, Octaipipe** OctaiPipe is a deep-tech company developing transferable control solutions for data centres, ensuring critical digital infrastructure is safe, secure, and sustainable. Lee Cameron, VP of Product, will present how OctaiPipe has used its in-house distributed AI platform to deliver its AI for Cooling Efficiency solution, and how the company will move beyond cooling towards a holistic data-centre optimiser using collaborative, federated AI. * **Mark Bjornsgaard,** **Founder and CEO, System Two Group** Mark Bjornsgaard is a founder and CEO who has grown numerous businesses from scratch to scale. Mark will be talking about heat reusing data centers, taking advantage of his experiences of founding Deep Green and Heatio, and how that is impacting the distribution of compute and the growth of edge. ** The sponsors:** * [Red Badger](https://red-badger.com/) Red Badger is the digital product transformation consultancy for blue chips and scale-ups. We work at the heart of organisations on the tough, complex challenges that get them close to customers. Making a positive impact where others fail, we embed new ways of working and build high performance platforms primed for innovation. Red Badger creates lasting business change through integrating robust product design with deep engineering expertise. * [Green Software Foundation](https://greensoftware.foundation/) The Green Software Foundation is a non-profit with the mission to create a trusted ecosystem of people, standards, tooling and best practices for building green software. ** The everything else:** At Code Green London, we believe that green tech has the power to create a better future for all of us. Join us on February 24th 2026 for an evening of learning, networking and collaboration towards building a more sustainable world. Follow [Code Green London on LinkedIn](https://www.linkedin.com/company/code-green-london/) to receive information about all upcoming Code Green London events. If you have inquiries or would like to get in touch, please contact us by email at codegreenlondon@gmail.com. If you are interested in getting involved with Climate Action Tech, you can find all the details [here](https://climateaction.tech/). Code Green London is an externally-organised group. All events are the responsibility of the organisers so please contact them if you have any questions.

We're back to our usual format of 3 speakers + Q&A followed by networking. 18:30: Doors open 19:00 Welcome by Alexandra Deschamps-Sonsino (organiser since 2011) 19:10 Rob Poll, membot, 'A Tale to Two Products: how the wisdom we gained from Line-us helped develop [membot](https://www.membot.net/)' 19:30 Rob Hallifax, [Windfall Energy](https://www.windfallenergy.com/), 'How to start a hardware startup' 19:50 [Andrew Delamare](https://www.linkedin.com/in/andrew-delamare-79a4111/), AWS Solutions Architecture Manager 20:10 Networking 21:00 End of event and move to a nearby pub There will be drinks (including non-alcoholic) and nibbles. **About our sponsors:** [Green Custard](https://www.green-custard.com/) is an award-winning AWS IoT specialist consultancy that helps organisations design, build, and scale secure cloud-connected products and solutions. With deep expertise across IoT architectures, data lakes, ML and agentic AI our IoT expertise spans from product innovation to smart factory innovation. We have full stack capability from embedded & mobile to cloud-native development. Green Custard partners with clients to deliver on their business outcomes whether modernising legacy devices, unlocking new value from existing data, or accelerating the delivery of production-ready solutions. Customers trust Green Custard for its technical excellence, pragmatic delivery, and we are proud of our customer success. [Aqua Libra](https://aqualibra.com/pages/flavour-tap) is redefining sustainable hydration through innovative, low-impact dispensing technology. Beyond its zero-sugar infused drinks, the brand has pioneered solutions such as the Aqua Libra Flavour Tap, a digitally controlled dispensing system that delivers chilled, filtered water with natural flavours on demand. By removing the need for single-use bottles and reducing transport emissions, the Flavour Tap enables offices, venues, and public spaces to offer great-tasting drinks with a dramatically smaller environmental footprint. Aqua Libra’s approach blends sustainability, smart technology, and convenience to meet the growing demand for healthier, greener beverage options.

Join us **the night before Elastic{ON} London** for an exclusive meetup, a perfect warm-up to the big day ahead! This is your chance to connect with the Elastic community, mingle with fellow attendees, and get energized for a full day of presentations at Elastic{ON} London. Don’t miss out! Register for the meetup and make sure you’ve also signed up for [Elastic{ON} London](https://www.elastic.co/events/elasticon/london) as well to experience a full day of learning and networking! **Date and Time:** Wednesday, February 25, from 6:00-8:30 PM **Location:** Davidson Building Address: 1st floor, 5 Southampton St, London WC2E 7HA Note: please use Exeter St entrance as the main entrance is closed after 6pm **Agenda:** * 6:00 pm: Doors open; say hi and eat some food * 6:30 pm: #Talk 1 - Re-thinking significant term discovery Mark Harwood - Ex-Elastic Core Developer and Lucene committer * 7:00 pm: Q&A * 7:10 pm: #Talk 2 - From Specs to Play: How I Built a Generative AI Game with Elastic + Microsoft AI Mike Richter - Principal Partner Solution Architect at Microsoft * 7:30 pm: Q&A * 7:40 pm: Networking and event wrap-up * 8:30 pm: Event close If you’re a long-time Elastic user or just starting your journey, this is the perfect opportunity to share ideas, meet new people, and get inspired. Invite your friends and RSVP on this page! **⚡️ Interested in giving a talk? ⚡️** Have you ever considered presenting on your Elastic use case? We welcome 5-10 minute lightning talks, 45-minute deep dives, and everything in between. If you're interested, please submit via our [CFP](https://sessionize.com/elastic-meetups/) or send us an email at [meetups@elastic.co.](http://meetups@elastic.co./)

Today we'll be looking at the work of the Italian artist Caravaggio. Caravaggio adopted *chiaroscuro* lighting in his paintings in the 16th century. *Chiaroscuro* is an Italian term referencing the contrast of light (chiar) and dark (oscuro) to model three-dimensional forms. It’s a style that has quite dramatic results and one that photographers can use to create dramatic images. **Join us for a workshop in 2 parts:** * Informative session on the incredibly interesting life and work of Caravaggio * Shoot chiaroscuro style * We will also discuss street photography tips EQUIPMENT: * Any camera * Any lens such as a standard 18-55, 24-70mm etc. OTHER ESSENTIALS * A fun and experimental attitude! TRAVEL * As usual check TFL website for any issues that may delay your journey \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- CONTACT * Alex 07956 264049 **TRAVEL EVENTS** **A WEEKEND IN VENICE – Oct 2026** https://www.meetup.com/londonphotographicopa/events/313109095/ **MONTHLY EVENTS** [https://www.meetup.com/londonphotographicopa](https://www.meetup.com/londonphotographicopa)

Come and join us for a coffee/tea and chat as we discuss what’s hype and what’s real as well as how analytics helps us fight human trafficking. All Food and drink must be paid for as you consume it. A minimum of a drink must be orders can be water soft drink or coffe/tea etc excellent cocktails available.

Join OutdoorLads popular weekly Thursday Bouldering evening at The Arch in Bermondsey. OutdoorLads London boulderers welcome all members of the LGBTQ+ community You'll be meeting with a supportive group of 5 to 10 plus boulderers who are always happy to introduce complete beginners or solve difficult bouldering problems with enthusiasts. We usually follow up with a pub visit. This event is for members of all levels of experience and all are welcome to come along to any of the sessions. Bouldering is a form of climbing where instead of long high routes, the 'problems', as they are referred to, tend to be shorter and focus on technique, balance, body positioning and sometimes power. Because of this different emphasis, bouldering doesn't have the hassle of climbing with ropes, harnesses and belaying, which makes the activities excellent for newcomers to the sport. If you're a seasoned climber you won't need convincing about the benefits of bouldering, but for those who've never climbed more than a staircase, the benefits are wide ranging: from the physical - improved strength, tone, balance, power and coordination; mental - problem solving, focus, concentration and body awareness; to the emotional - relaxation, a sense of achievement and a feeling that mind and body are working together perfectly ('feeling psyched'). On top of all this, bouldering tends to be a very social sport where you can hang out with mates and each have a go as you feel regardless of what level you climb at.

In February, we are taking a look at what is happening with agentic AI and data pipelines Join us in lively Hoxton as we learn from Carmen's and Laura's learning from real-world experiences with agentic AI systems in data pipelines. We are running this event in collaboration with **[Sahaj Software](http://www.sahaj.ai)**. **6pm:** Doors Open **6:30pm:** Talks Start ️The Speakers️ ***Beyond the Hype: Practical AI for Real-World Data Engineering Time Sinks*** ***Carmen Mardiros, Solution Consultant at*** ***[Sahaj Software](https://www.sahaj.ai/)*** ***([Carmen's LinkedIn](https://www.linkedin.com/in/carmenmardiros/))*** ***Abstract*:** While the world is obsessed with agentic self-healing ETL pipelines, data engineers everywhere still spend hours upon hours on the same tasks as before -- debugging failing tests, exposing new fields into pipelines, navigating schema changes, QA-ing data and business logic. In this session we'll look at some practical examples from the trenches around how to shrink those time sinks using AI coding assistants so that you can spend more time on what really matters. Examples are dbt-based and Claude Code but accompanied by core tenets applicable to any stack and any coding assistant. ***Carmen's Bio:*** Carmen Mardiros has worked around analytics and data for 15 years. Her experience covers areas such as Data architecture design and implementation and has worked in roles that cover Data Strategist, Lead Data Engineer, Data Warehouse Architect, Tracking Developer, Product/Project Manager, Technical BA, Insight Analyst, Data Modeller. ***Agentic AI for Data Pipelines: Our Good, Bad, and Ugly Learnings*** ***Laura Bogaert, Co-Founder and COO at [Tracer.cloud](https://www.tracer.cloud/)*** ***([Laura's LinkedIn](https://www.linkedin.com/in/laura-bogaert/))*** ***Abstract:*** As teams move from single models to agentic systems, data pipelines present a uniquely hard production challenge: failures are distributed, context is fragmented, and root-cause analysis is slow. This talk shares practical learnings from building agentic AI systems for troubleshooting real-world data pipelines, including what worked, what didn’t, and why data ontology and context management are critical. Attendees will leave with concrete insights into designing agentic architectures that actually hold up in production. ***Laura's Bio:*** Laura is a co-founder of [Tracer.cloud](http://tracer.cloud/), where she works on building agentic AI systems for alert investigation in production data pipelines across industries. She started her career at McKinsey as part of the fintech and biopharmaceutical team working on AI strategy and M&A. She holds a BSc from University College London and a MSc from Oxford University. **8pm:** Talks finish. We have the space for networking until 9pm. There will be a short break between the talks. Afterwards, we may head to a pub to continue chatting. You can sign up by subscribing to this event **IMPORTANT**: Please make sure to have a ***valid form of ID***. See you all on the 26th February Happy Networking **About our collaborators**: [Sahaj](https://www.sahaj.ai/) is an artisanal technology services company crafting purpose-built AI and data-led solutions for our clients. By attending this event, you agree to abide by our rules of conduct: * Respect others' opinions which may differ from your own. * Keep it appropriate - no harassment of fellow attendees will be tolerated. * If you see something or have a complaint, please reach out to one of the organisers on LinkedIn or email events@dataengineerslondon.com.

Join OutdoorLads weekly Saturday bouldering morning event at Vauxwall West - please check our main event page on our website (link in the comments below). We welcome all members of the LGBTQ+ community, and you will be socialising with a supportive group boulderers who are always happy to introduce complete beginners to the sport or solve difficult bouldering problems together. This event is for members of all levels of experience and all are welcome to come along to any of the sessions. Bouldering is unique. There are few sports out there that offer a mental and physical challenge no matter what skill level you are at. Each route consists of several holds that the climber uses, focusing on problem-solving and technical movements to help them reach the top. No two routes are ever the same, and the colour-coded system indicates the difficulty level, so there's a climb for everyone to enjoy! If you have never tried bouldering before, please ensure that you have gone through the centre's safety and induction video beforehand (https://londonclimbingcentres.co.uk/pre-register/) as you will be required to answer a few safety questions when registering at the centre.

Join us on February 25th for talks from engineers at **Nebius, Fireworks AI,** **Together AI** and **Cerebras** \- four companies working on distinct approaches to AI infrastructure\, from cloud\-native training platforms to custom silicon\. Topics: * **Nebius** \- Tips and tricks for Training High\-Performance Speculators by Filipp Fisin * **Fireworks AI** \- LLM evaluations and closing the benchmark\-to\-production gap by Shaunak Godbole * **Cerebras -** Technology underpinning the fastest inference by Dmitry Gaynullin * **Together AI** \- Road to 5M Sequence Length: Breaking Memory Barriers in Context Parallelism by Max Ryabinin If you’d like to give a talk or become a partner for one of the upcoming meetups, message [https://www.linkedin.com/in/fedorshabashev/](https://www.linkedin.com/in/fedorshabashev/) or [https://www.linkedin.com/in/kirzharov/](https://www.linkedin.com/in/kirzharov/) In the meantime, you can watch the previously recorded talks: [https://youtube.com/@londonpytorchmeetup](https://youtube.com/@londonpytorchmeetup) Please subscribe to our channel! ❤️

Want to be a speaker? submit your talk to our Call for Presenters!!! https://sessionize.com/cbus-hug-2026/

Excited to share that AWS Cloud Club's first meeting will take place on Thursday, February 26th at 5pm - 6pm! We’re collaborating with [Big Data & Analytics Association](https://www.linkedin.com/company/big-data-analytics-association/) to host [Alok Jha](https://www.linkedin.com/in/alok-jha-42abb928/), Head of Product Management for AWS Intelligent Application Protection at Amazon Web Services, for a tech talk + Q&A on his journey in leading cutting-edge innovation in industry. If you’re interested in cloud, cybersecurity, AI, or product management, this is a session you won’t want to miss. Make sure to join our Meetup and GroupMe to stay up to date for future events and collabs!

We will show a variety of methods for building agents that run in Microsoft Foundry. This covers the different types of agents: Prompt, Multi, and Hosted, as well as the development lifecycle using evals and traces.

**New Dojo Location!** **Draft Day Columbus** 1130 Dublin Road Columbus, OH 43215 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)