OCaml Programming

**We're back at Salisbury House for our summer London Airflow Meetup! Join fellow members of the data engineering community for an evening of engaging talks, great food and drinks, and exclusive swag!** **PRESENTATIONS** ***Talk #1: The Orchestration Layer: A Blueprint for Scaling Dynamic DAGs with Integrated Data Quality Gates*** * **Speaker**: [Vasudev Maduri](https://www.linkedin.com/in/vasudevmaduri/), Staff Data Engineer, Admiral Group Plc Ensuring high-quality data, accuracy, completeness, and schema validity is essential for building data trust. However, scaling data quality checks across diverse datasets often leads to duplicated boilerplate Python code, human error, and a massive bottleneck for Data Engineering teams. In this talk, we’ll explore how to shift data quality from a backlog of tech debt into an automated, self-serve developer experience directly tied to Airflow. We will demonstrate how to build a multi-faceted data observability framework that empowers end-user teams to define their own DQ rules without writing any Python code. By hiding complex Airflow code, users simply select their parameters—YAML configurations that instantly translate into fully dynamic, end-to-end DAGs, including in-flight data quality gates. The core of this session focuses on the technical implementation of integrated DQ checks that live directly *inside* the generated pipelines. You’ll learn how this metadata-driven approach enables a "shift-left" strategy for data observability, automatically enforcing data contracts and routing alerts without manual engineering intervention. ***Talk #2: Self-healing Data Pipelines in Airflow*** * **Speaker**: [Nilesh Khandalkar](https://www.linkedin.com/in/nileshskhandalkar/), Senior Manager, Capgemini Modern data pipelines remain largely reactive—failures trigger alerts, manual retries, and ongoing operational overhead for engineering teams. As systems scale, this approach introduces fragility, delays, and growing complexity in maintaining reliable workflows. This session explores how to design self-healing data pipelines in Airflow using practical patterns such as intelligent retries, conditional branching, and targeted recovery mechanisms. Real-world failure scenarios are used to illustrate how pipelines can detect issues, trigger remediation steps, and resume execution without full restarts or human intervention. The session also looks ahead to how AI-assisted anomaly detection can further enhance these systems by identifying unexpected patterns and enabling more proactive, resilient data workflows. ***Talk #3: What We Got Right (and Wrong) Building a 50-Source Data Platform on Airflow*** * **Speaker**: [Arnaud Caldow](https://www.linkedin.com/in/arnaud-caldow-384423142/), Senior Data Engineer at Collibra Collibra helps enterprises govern their data, but how does Collibra's own data team manage the data that powers the business? The answer is an Airflow-based platform that stitches together dlt, dbt, Kubernetes and Collibra's own product for governance -- all orchestrated through 87 DAGs serving 12 business domains. This talk traces a data point's journey through the stack: from API extraction via dlt pipelines running inside KubernetesPodOperator pods, through a layered dbt architecture where platform engineers standardize data and analysts build business models on top, into analytics outputs that serve multiple business teams, and finally back into Collibra Data Governance via reverse-ETL integration DAGs. Along the way, I'll share the patterns that emerged from operating this at scale: how we evolved from one-off custom pipelines to a reproducible framework that's documented well enough for AI subagents (or a new hire) to generate models from scratch, how our own Pod Operators let us test feature branches on shared environments, and how we're leveraging that same mechanism to migrate from Redshift to BigQuery (and from Airflow 2 to Airflow 3) without downtime. Behind the scenes, a 1Password-backed pipeline diffs credential hashes nightly, catching rotations before they break a DAG. **AGENDA** * **5:30-6 PM:** Arrivals, networking, food & drinks * **6-7:45PM:** Presentations * **7:45-8PM:** Networking

Script Reading, Improvisation, Voice Projection, Games, Public Speaking and audition techniques will be some of the points covered over the coming terms. Drama is ideal for building confidence, helping with articulation and developing presentation skills. It is also a lot of fun! The classes have built up over the last five years and are run by Mario Renzullo, who was an original member of the famed Anna Scher Theatre and made his professional debut in 1970, and went on to have many lead TV, film and theatre roles. Mario founded the theatrical agency Smart Management, which has been running for over twenty years. The classes are open to a wide age range and welcome those new to acting as well as those with professional acting experience. Typically, between 12 and 20 people join us each week, creating a lively and engaging group dynamic. Venue: The Angel Church, Chadwell Street EC1R 1XA Five minutes’ walk from the Angel tube station. Thursday evenings at 7.00 pm – 8.30 pm. Fee: £10.00 cash per session. For more information, please email your contact details to: [smartmanagement@btconnect.com](mailto:smartmanagement@btconnect.com)

Ready to get outside? Our Thursday morning session in Dulwich park is back! At this moment we can meet with up to 30 people (of more than two households) to do outdoor exercise and walks. However, i like to keep our exercise groups small, so I have set the maximum participants at 12. For now this walk is for our experienced Nordic Walkers only, who already used to Nordic Walk with us regularly before Covid 19 kept us indoors, and who have their own Nordic Walking poles. As this session is outdoors, we will not ask you to wear a face mask, but we do ask you to keep 2 meters apart. Some of our walkers might be immune compromised or more at risk, so please help us keep everyone safe! Please do not come to the session and stay at home if: - you know you have been in contact - in the last 2 weeks- with someone with symptoms of possible Covid, or if you have been in contact with someone who tested positive. - you have any of the following symptoms: (new) Loss of smell/taste, Persistent cough, Fatigue, Loss of appetite, Skin rash, Hives, Fever, Severe muscle pain, Shortness of breath, Diarrhoea, Delirium, Abdominal pain, Chest pain, Hoarse voice, Eye soreness, Sore or painful throat, Nausea or vomiting, Headache, Dizziness or light headedness We meet by the cafe in the middle of the park. Session Price: £10 per session, £89 for a 10-session card or £70 unlimited sessions per month. Session cards and pay Monthly can be used in any of our outdoor walks or indoor Zoom classes sessions (except for the Parkinson's sessions). Pay What Works: The price shown above is the “true” value of the session that best reflects the work I put into preparing and leading your session. However, I understand that not everyone can afford to pay full price, and I don’t want that to stop you from joining us. In an effort to find a balance between more financial accessibility and sustainable pricing, I now offer a “Pay What Works” model. This allows for financial flexibility while still valuing and respecting the work and energy I provide in creating and delivering these classes. Then send an email to ailien@fitandhappyoutdoors.com with the heading “INVOICE please”- followed by “FAHO 1” to pay full price as quoted below, “FAHO 2”, for 20% off, or “FAHO 3” for 50% off. Pllease do tell me if you want to pay for 10 sessions, or if you’d like to pay monthly. I prefer payment by bank transfer, but if that is not possible you could pay in cash. No cheques please, the queues by the banks are just too long. We walk in all safe weather conditions – if a walk is cancelled, we will contact you to let you know. Please check for text messages or Meetup messages before leaving home!

¡Bienvenidos! Welcome! *Etc Etcetera es un intercambio de conversación totalmente gratis, donde puedes practicar inglés y español con hablantes nativos, y conocer unos amigos nuevos.* **Come and join us at ‘Etc Etcétera’ this coming week, our Spanish/English language and culture exchange based here in Peckham. We are a group of mixed english and spanish speakers that meets at 7.30pm every other Thursday - feel free to show up whenever you can make it through the evening.** \*\*\* This has always been, and remains, a pretty relaxed, free-flowing intercambio - absolutely no pressure, so the plan is just take things at your own pace and get chatting to the person nearest to you. A basic grasp of your second language (si sea Español o Ingles) is strongly recommended.. The guys are all absolutely lovely and super welcoming, we have new people every week alongside the growing squad that are now fast becoming our regulars, our family and our friends. We will be there, sharing stories and ideas over the course of the evening, collecting some new friends, and making plenty of grammatical errors along the way. \*\*\* Absolute everybody is welcome – this is an open, LGBTQIA+ safe, and inclusive space. Come alone, or bring some friends – you’ll always be welcomed with open arms and a smile. **Our goals at Etc Etcétera:** 1. Build new connections across the thriving Latin American and Spanish-speaking community here in South East London 2. Improve your language abilities, whether you’re working on your Spanish or looking to perfect your English 3. Make new friends and build up a network of like-minded people interested in Latin and Spanish culture, right here in Peckham 4. Support local businesses in the surrounding area \*\*\* **Food and drink:** **We typically meet from 7.30 at Kruk Restaurant in their front garden (they have heaters) - they have arranged a massive discount on drinks (3.50 pints, yeeees) and on food in their new restaurant all night.** Occasionally we move location once we get going, depending on the vibe; so just join the whatsapp group for updates, other plans and to stay in touch with new squad you’ve met at an intercambio: [https://chat.whatsapp.com/JkZKW9V8cvz1XaX1mSt8ag](https://chat.whatsapp.com/JkZKW9V8cvz1XaX1mSt8ag) request to join here). **Transport / getting here:** By Train: Peckham Rye Station is right round the corner, serving London Bridge, Blackfriars, Clapham Junction and Overground Services. Also, multiple bus routes stop right outside the station. They run until late! \*\*\* Really looking forward to seeing you there! RSVP to let us know you’ll be coming and join the WhatsApp group for more updates and to join the community We’re normally there for a few hours so come and go as you please

Great Opportunities abound when there is a lot of uncertainty or negative sentiment. That time is now! Prepare your plan or start taking focused action now while you can. If you haven't written out a plan yet for 2026, what are you waiting for. Lets get one together for you. Scott's book can help get you started or we can discuss at the meetup. https://www.amazon.co.uk/Achieve-Anything-SIMPLE-Uncomfortable-UNSTOPPABLE/dp/1839758260/ref=tmm_hrd_swatch_0 or borrow it from the Richmond library network: https://richmond.spydus.co.uk/cgi-bin/spydus.exe/FULL/WPAC/ALLENQ/175840303/147362136,1 Best wishes! Scott and Roxane This meetup is a great place to chat with like minded people about property investing e.g. the various strategies available, ideas on how to raise finance, cashflow vs capital gains, calculating and comparing ROIs, regional pro's & cons, and the various tools and resources people are using to up their property game. This property meetup is open to everyone – from the greenest newbies to the grizzliest tycoons! This is a traditional networking event. There are no sales pitches or “upsells” – it’s just a relaxed and informal get-together of likeminded people!!This meetup is a great place to chat with like minded people about property investing e.g. the various strategies available, ideas on how to raise finance, cashflow vs capital gains, calculating and comparing ROIs, regional pro's & cons, and the various tools and resources people are using to up their property game. This property meetup is open to everyone – from the greenest newbies to the grizzliest tycoons! This is a traditional networking event. There are no sales pitches or “upsells” – it’s just a relaxed and informal get-together of likeminded people!!

**NOTE: PLEASE READ THE DESCRIPTION BELOW FOR REGISTRATION:** **OWASP AI Security Summit** is taking place at **Infosecurity Europe 2026** on **Thursday, 4 June 2026 at ExCeL London** **Location inside Excel:** South Gallery Rooms 18 & 19 This summit brings together security leaders, researchers, and enterprise practitioners to discuss the latest developments in GenAI and Agentic AI security — including emerging threats, governance, incident response, real-world implementation lessons, and the evolving OWASP guidance shaping the industry. Sample sessions include: • The State of GenAI: Key Trends and OWASP GenAI Security Project • Beyond the Top 10: The Next Chapter of the Agentic Security Initiative • Agentic Security at Microsoft: Strategy, Implementation, and Lessons Learned • Implementing the Agentic Top 10 at AWS • 22 Seconds to Contain: Rewriting IR for Agents • Top 10 for LLMs Update • No Room for Hype: Securing Agentic AI Inside a UK Bank Featured speakers and contributors include OWASP GenAI Security initiative leaders and experts from: Microsoft, AWS, Lloyds Banking Group, OWASP, Deep Cyber, Zenity, and more. **Location inside Excel:** South Gallery Rooms 18 & 19 **REGISTER TO ATTEND HERE** **Register for Infosecurity Europe to attend the summit -** use promo code **OWASP** for a free pass: [https://www.infosecurityeurope.com/en-gb/visit/owasp-gen-ai-security-summit.html](https://www.infosecurityeurope.com/en-gb/visit/owasp-gen-ai-security-summit.html)

# 📣 Paid event 👉 call for booking *** ## 👉 Standard Ticket: £549 💷 ## 👉 Early Bird: £499 💷 ## **👉 WhatsApp: +44 (0) 7470914266** ⚡ *No coding? No problem. Just bring your idea.* *⚡ From Idea to Production — Build Real Apps with AI as Your Senior Developer — In 4 Weekends* ## **🏗️ Workshop Format** * 📅 Duration: **4 Weeks (Weekends)** * ⏰ Time: **13:30 – 17:00** * 🧑‍🏫 Format: **Instructor-led + Hands-on** * 👥 Style: **Build together in class** * 💻 Outcome: **1 fully working production-ready app** # **🗺️ 4-WEEK LEARNING JOURNEY** *** ## **🟢 WEEK 1 — *“From Zero to First App”*** ### **🎯 Theme: *Understand React + Think Like a Builder*** **Slogan:** 👉 *“You don’t need to know everything to start building.”* ### Topics: * What is React (in simple terms) * Components & JSX * Props & State (core mindset) * React project setup (Vite) * Folder structure (real-world style) ### Vibe Coding: * Prompting AI to: * Generate components * Explain code * Fix errors ### Hands-on: ✅ Build your first UI (dashboard layout) ✅ Create reusable components *** ## 🟡 WEEK 2 — *“Make It Alive”* ### 🎯 Theme: *State, Events, Lifecycle Thinking* **Slogan:** 👉 *“Static pages don’t get jobs. Interactive apps do.”* ### Topics: * useState, useEffect (lifecycles simplified) * Event handling * Forms & inputs * Conditional rendering ### Vibe Coding: * AI as debugger: * “Why is this not updating?” * “Optimize this component” ### Hands-on: ✅ Build interactive features ✅ Form submission + validation ✅ UI logic (loading, error states) *** ## 🔵 WEEK 3 — *“Connect to the Real World”* ### 🎯 Theme: *API Integration & Real Data* **Slogan:** 👉 *“Real developers don’t hardcode data — they connect systems.”* ### Topics: * REST API basics (simple explanation) * Fetch / Axios * API structure understanding * Environment variables ### Vibe Coding: * Generate API services with AI * Debug API issues with AI prompts ### Hands-on: ✅ Connect to a real API (or your Node.js backend) ✅ Display dynamic data ✅ CRUD operations (Create, Read, Update, Delete) *** ## 🔴 WEEK 4 — *“From Project to Product”* ### 🎯 Theme: *Production, Deployment & Portfolio* **Slogan:** 👉 *“Don’t just build it. Launch it.”* ### Topics: * Code cleanup & structure * Basic performance tips * Deployment (Vercel / Netlify) * GitHub project setup ### Vibe Coding: * AI for: * Refactoring * Documentation * README generation ### Hands-on: ✅ Deploy your app live 🌍 ✅ Prepare portfolio-ready project ✅ Demo Day (presentation) ### Social Media *** ## zero2hero.net - Technology Training Center WhatsApp: +44 (0) 7470914266 E-mail: info@zero2hero.net Address: Unit 15 Castle Square, 40 Elephant Rd, London SE17 1EU 🎬 Youtube: https://www.youtube.com/c/zero2hero-meta 🐦 Twitter: https://twitter.com/zero2hero_uk 📸 Instagram for training: https://www.instagram.com/zero2hero.training 🔗 LinkedIn: https://www.linkedin.com/in/senrasim 👋 Meetup: https://www.meetup.com/zero2hero 🎟️ Eventbrite: https://zero2hero-meta.eventbrite.com

Join us on this long exposure session where we will be providing (almost) everything you need to smooth water, blur clouds and make moving objects turn ghost-like or disappear. **KASE FILTERS** * We will provide a set of **Kase Magnetic Filters** for this session. **PLATYPOD TRIPOD SUPPORT** * We will also provide you with a PLATYPOD tripod support so you'll be able to LEAVE YOUR TRIPOD AT HOME! * All you need to bring is your camera and of course a fun and experimental attitude! Be prepared to hop on and off public transportation to get to locations where our Platypod will be more useful. WANT TO BUY? USE OUR DISCOUNT CODES Kase filters **www.kase.com** code for a 10% discount code **10kaalex** Platypod **www.platypod.com** 20% discount code: **London20** WHAT YOU WILL LEARN * Exposure settings * How to focus and compose * Best practise for long exposure photography * Filter types - what they do - how and when to use them REQUIRED EQUIPMENT * A tripod * Shutter release * Lens: 18-55mm, 24-70mm or similar EXPERIENCE * Beginners and refreshers CLOTHING * Check the weather and dress accordingly OTHER ESSENTIALS * As usual check the TFL website for any delays that may interrupt your journey CONTACT Alex 07956264049 **UPCOMING EVENTS** **VENICE PHOTOGRAPHY WEEKEND - Oct 2026** **[https://www.meetup.com/londonphotographic/events/313109100/](https://www.meetup.com/londonphotographic/events/313109100/)** **MONTHLY EVENTS** **[www.meetup.com/londonphotographic/events](http://www.meetup.com/londonphotographic/events)**

Morning at 11:00 am in Borough Market. 12:00 midday lunch, social and chat in the Mudlark pub for an hour followed by a walk along the Southbank. Meet in Minerva Square at 11:00am and again at 1:00pm if you are joining us for the second part only. What 3 words location for the start is: ///cars.woods.lively I will create a WhatsApp group for the walk the week before and post a link on comments here. Please note that this is an analogue photo walk and we will be shooting film.

PyData London 2026 brings together data scientists, engineers, and researchers from around the world for three days of insightful talks, tutorials, and community connection. Hosted in one of Europe’s leading tech hubs, the event highlights the latest developments in Python, machine learning, and data science. Attendees can expect a mix of cutting-edge research, real-world applications, and opportunities to network with industry leaders. Whether you're a beginner or an expert, PyData London offers something for every level of the data science community. **THIS IS NOT A TICKET- TICKETS MUST BE PURCHASED ON CONFERENCE WEBSITE.** https://pydata.org/london2026

Part of the art of street photography is telling a story. In this workshop you'll learn how to tell a story and develop street photography skills. You'll be given some tips and then set a series of challenges to help build your confidence when shooting street photography. EXPERIENCE Complete beginners or those who would like a refresher. WHAT YOU WILL LEARN: * What makes an interesting subject * Candid or posed and how to approach people * The legalities * Camera settings * Depth of field * Composition * What shutter speeds are important * Black & white and why you need to think about colour EQUIPMENT: * Any camera * A standard 18-55 kit lens will do or use a 70-200 for candid shots OTHER ESSENTIALS * A fun and experimental attitude! PAYMENT OPTIONS * PayPal via RSVP - Meetup transaction fee will be added. and you'll automatically be added to attend * Send £25 via PayPal to \*\*[creativebeansproductions@gmail.com**](http://creativebeansproductions@gmail.com%2A%2A/) with no extra fee. * Text Alex on 07956264049 and we will add you to the event attendee list. TRAVEL * As usual check TFL website for any issues that may delay your journey. CONTACT Alex 07956 264049 **VENICE PHOTOGRAPHY WEEKEND - Oct 2026** [https://www.meetup.com/londonphotographic/events/313109100/](https://www.meetup.com/londonphotographic/events/313109100/) **UPCOMING EVENTS** [www.meetup.com/londonphotographic/events](http://www.meetup.com/londonphotographic/events)

Speakers of English and Korean unite! Language exchange focused meetup at a pub venue in a very central London location. For a map of the location, see the website of the bar linked in the venue details given here. People at any level of Korean (and English) are welcome at this Meetup. Complete beginners wanting to explore learning Korean also welcome. Participants come from the UK, Korea and many other countries. This will be an opportunity to informally study and practice Korean and/or English, and help others with their Korean and/or English in return. It is also a good chance to chat to others with interests in and links to Korea. We'd also be very grateful if attendees could buy at least one drink (soft/alcoholic) at the bar to ensure that we continue to be welcomed at this venue. We look forward to seeing you all there, **To avoid disappointment, please book your place before you come.** About this Meetup Group (http://korean.meetup.com/142/about/)

We start June by reading Amanda Montell's 2019 effort, *Wordslut: A Feminist Guide to Taking Back the English Language*. Our first non-fiction of 2026 is a 'brash, enlightening, and wildly entertaining work of pop linguistics and a feminist look at gendered language and the way it shapes us.' (Book jacket) '[Montell], reporter and feminist linguist, deconstructs language—from insults, cursing, gossip, and catcalling to grammar and pronunciation patterns—to reveal the ways it has been used for centuries to keep women and other marginalized genders from power.' -Waterstones https://www.goodreads.com/book/show/53066379-wordslut In the eternal hope of good weather in London in the spring/summer, we will have the meeting in Haz St Paul's lovely outdoor area. So come along for some great atmosphere, delicious Turkish food, and insightful discussion. N.B. We will be charging an event fee of £3, non-refundable, to discourage no-shows and contribute to the running costs of the group. Please only sign up if you intend to come along as space is limited to make for an effective discussion!

We have moved to guild.host. Look us up there. https://guild.host/events/buckeye-cocoaheads-rcavwd

We've moved to guild.host Look for us there. https://guild.host/events/buckeye-cocoaheads-nscoders-tcbrk5

We are bringing Microsoft Build sessions to Columbus Ohio! The Central Ohio Azure Meetup and Central Ohio .NET Developer's Group (CONDG) are coming together to bring some of the labs and breakouts from Microsoft Build to your backyard. In this free, 1 day event, you are going to Build stuff with us! And yes, there will be free food. So please RSVP for a head count!

Columbus Code & Coffee is an inclusive, informal co-working session. People of all skill levels attend, and we love it that way. Many people (optionally) bring projects to work on, and many other people (optionally) socialize the entire time. It's entirely up to you! **What to Expect at the Intro Circle** \~\~\~\~\~\~\~\~\~\~\~\~\~ Near the beginning of the event (1:30 pm), we do a standup: * Organizer announcements, updates, and logistics Round 1 - (7 secs max): * Your name * What you're working on * What you can help others with Round 2: * Community events you wanna plug. If none, that's cool too. Round 3: * Job opportunities you're hiring for OR announce that you are looking for one. If none, that's cool. After the introduction circle, everything is self-organized! Feel free to work alone, pair up, attend one of our workshops/presentations, or mingle!

*Note: this is a demonstration event only, you **will not** shoot you own images. However, if you bring your camera we can test it for compatibility with the studio lights.* Bondage elements can add an extra layer of emotion and artistry to your images. Sample images on the internet are however dominated by BDSM style shots that are often sexualized and emphasize the model being in distress. In this demonstration Rachel and I show ways to use bondage elements in an artistic way. We explore the types of accessories that work best in artistic images and the best way to photograph them. Our model is Rachel Adams, an internationally known fetish model with many years of experience in this genre.

We are going to build together with all the CLIs! E will be doing it at Columbus Code and Coffee Agenda --- Hosted By James Power, Organizer Pete Gordon, Organizer Just a Software Guy in the age of the Internet. Complete your event RSVP here: https://gdg.community.dev/events/details/google-gdg-columbus-presents-ai-improv-lets-build-a-game-together-with-claude-code-codex-and-gemini-and-be-the-judge/.

**Latest 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 speakers for our Monthly Meetups! Fill out the form if you are interested in presenting to the Python Community. https://forms.gle/ehSfUAC2WgR34Crq9