Chaos Computer Club - recent events feed

Docling is an open-source Python package that simplifies document processing by parsing diverse formats — including advanced PDF understanding — and integrating seamlessly with the generative AI ecosystem. It supports a wide range of input types such as PDFs, DOCX, XLSX, HTML, and images, offering rich parsing capabilities including reading order, table structure, code, and formulas. Docling provides a unified and expressive DoclingDocument format, enabling easy export to Markdown, HTML, and lossless JSON. It offers plug-and-play integrations with popular frameworks like LangChain, LlamaIndex, Crew AI, and Haystack, along with strong local execution support for sensitive data and air-gapped environments. As a Python package, Docling is pip-installable and comes with a clean, intuitive API for both programmatic and CLI-based workflows, making it easy to embed into any data pipeline or AI stack. Its modular design also supports extension and customization for enterprise use cases. We also introduce SmolDocling, an ultra-compact 256M parameter vision-language model for end-to-end document conversion. SmolDocling generates a novel markup format called DocTags that captures the full content, structure, and spatial layout of a page, and offers accurate reproduction of document features such as tables, equations, charts, and code across a wide variety of formats — all while matching the performance of models up to 27× larger. about this event: https://talks.python-summit.ch/sps25/talk/QJLGCZ/

Traditionally, marketing campaign analysis relies on simple metrics like the number of purchases made after a contact, or conversions following a promotion. While these numbers tell us what happened, they don’t reveal why it happened or if the campaign truly made a difference. Such analysis can’t distinguish between customers who would have acted anyway and those who were genuinely influenced by the campaign. The key question is: did the campaign actually cause the desired effect? In this practical and beginner-friendly session, we’ll explore how Causal Machine Learning provides the missing piece in campaign evaluation and targeting. Starting from real-world scenarios, we’ll dive into: Why causality matters more than correlation when evaluating ad performance. How to estimate the true impact of a campaign using uplift modeling and treatment effect estimation in just a few lines of code. How to target users who are not just likely to interact with ads, but whose behavior can be influenced by the campaign (for example, to reduce churn or boost engagement). The session will be hands-on with Python, with clear examples drawn from marketing applications. about this event: https://talks.python-summit.ch/sps25/talk/MNJ98W/

Are we OIDC yet ? YES ! We are ! OpenID Connect evolved as the one and only identity standard in the modern web. With MSC3861, the [matrix] ecosystem is finally moving to OIDC as the authentication standard amongst clients and homeservers. Out of curiosity, I started implementing a native OIDC implementation from scratch : no OAuth 2.0 library, no Ruma ; just the [matrix] Dart SDK, an HTTP client and the MSC in front of me. This talk will be about the lessons learned. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/XLV7PZ/

The federation protocol is how Matrix homeservers communicate between each other. In private federations this isn't particularly challenging as the network is trusted but in the public federation this isn't true. This talk dives into what protocol improvements are in the works to make the public federation more secure against Byzantine actors, particularly against "state resets": an unintended rollback of room state. We'll explore why this problem is hard, what some of the failure modes are, and how we are working on addressing them. The federation protocol, in particular state resolution, is one of the most important parts of Matrix. In the current algorithm, the output from the algorithm can be counter-intuitive, and multiple people have tried to explain how it works (including a talk from me at FOSDEM this year!) with varying degrees of success. This behaviour sometimes rears its ugly head when your room state has rolled back to an earlier point in time for no good reason: a "state reset". Fixing these issues is hard, partly because the current algorithm is so tricky - so over the course of 2025 we’ve been working on improving and (eventually) simplifying it. Along the way, we've developed tooling to help us observe and replay room state in the form of TARDIS: Time Agnostic Room DAG Inspection Service. This tool has been critical for us to produce minimal working examples of state resets and to experiment with algorithmic changes to fix the underlying issues. We'll explore some of these scenarios in TARDIS during the talk. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/YK9F38/

In this talk we will provide insights on the new Element Server Suite (ESS) editions which provide an Element-supported way to deploy Matrix stacks. ESS is available in three editions - [ESS Community](https://github.com/element-hq/ess-helm) - the free Matrix distribution from Element for small-/mid-scale, non-commercial community use cases - [ESS Pro](https://element.io/server-suite) - the commercial Matrix distribution from Element for professional use - [ESS TI-M](https://element.io/server-suite/ti-messenger) - a special version of ESS Pro focused on the requirements of TI-Messenger Pro and ePA We will dive deep into each edition, explain how they're meant to be used, shed light on the components they include and discuss which use cases they are tailored to. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/MHZQVK/

I Agents are the next big thing everyone has been talking about. They are expected to revolutionize various industries by automating routine tasks, mission critical business workflows, enhancing productivity, and enabling humans to focus on creative and strategic work. Of course, you can apply them to your everyday coding tasks as well. In this talk we’ll go over what those agents can bring to the table of coding world, and why they can deliver the promise of coding smarter that the current generation of coding assistants can’t. We will then dive right into a quick live coding session where I’ll show what such agents can do in real life and how you can start using them to enhance your everyday life already right after the talk. And we’ll finish off with some remarks on what the future of programming might look like in the near future as those agents get included into your everyday life. about this event: https://talks.python-summit.ch/sps25/talk/NTGKGW/

Matrix was built to become the open communication of the web and serve everyone. But, as the Internet and email did, its network effect started with governments. Today, and as proven by the audience in the room, most European governments and several others are either using it or looking at implementing it for their communications. This talk will tell the story of how we got there and why. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/CAUAHD/

Element X is coming to web and desktop! What does that mean? We’re going to make the apps simple, familiar, reliable and fast! Come learn more about the vision we have put together and all the progress we have made so far! The talk will cover: * The qualities/goals we are aiming for in EWX * The high level plan to achieve this including: * Our product and design strategy * The phased plan for delivery * The key technologies that will enable the transformation * An update on progress and next steps Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/SJFXGH/

Demokratis.ch is a non-profit project working to modernise the consultation procedure—a key democratic process that allows Swiss citizens to provide feedback on proposed laws and amendments. Today, the process is slow and cumbersome for everyone involved: it requires studying lengthy PDFs, writing formal letters, and even synthesising legal arguments by copy-pasting into Excel. There’s a huge opportunity to streamline this process and make this democratic tool more accessible and inclusive. In this talk, I’ll share how we’re tackling this challenge with machine learning: building data processing pipelines, extracting features from endless PDFs, embedding and classifying text, designing and evaluating models—and ultimately deploying them in production. Because the data comes from the federal administration and 26 different cantons, it’s often heterogeneous and in varying formats. Data quality, in general, presents many challenges for both training and evaluation. Spoiler: PDF is a pretty terrible format for machines … Our approach is practical and pragmatic, and our code is open source, so you’re welcome to explore our solutions or even contribute yourself! about this event: https://talks.python-summit.ch/sps25/talk/EWUJKH/

Presentation of the Luxembourg efforts to establish a sovereign instant messaging ecosystem for the public and private sector for Luxembourg. More details to follow. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/GEEKMY/

Access control is the core of any system's security, but usually provided by a single, centralized server. However, access control in a Matrix room is decentralized: every participating server *independently* decides *who* is authorized to send and receive *which* events, without consulting any other server. To the surprise of many, these decisions are still *eventually* consistent even if all but one server is malicious, but seeing *why* requires a new way of thinking about access control. I will explain the necessary design patterns from decentralized systems science, and show how they can be weaved together for a practical explanation of what Matrix is, and why Matrix can reach its astonishing levels of security and resilience. In this talk, I provide a primer on **design patterns from decentralized systems theory**, and explain what they mean for the current and future design of Matrix in practice. I will start with **concurrency as the root of all problems in decentralized systems**, and how network partitions and arbitrarily malicious servers stand in the way of consistency. Based on these problems, I will explain **conflict-free replicated data types** (CRDTs) and hash linking as the solution to still make a Matrix room eventually converge at all benevolent servers. Finally, I will show you my **access control to the best of knowledge and belief** way of thinking about eventually consistent access control in Matrix – you need to think in **two authorization decisions per event**, of which one is final on receiving the event, while the other one may ever be changing on receiving new concurrent events. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/X3KDAQ/

A welcome message and useful information from the organisers. You will also find useful information on our [website](https://www.python-summit.ch/). Or feel free to ask any member of staff if you have a question. about this event: https://talks.python-summit.ch/sps25/talk/D7KQWT/

In this talk we will cover - what is the Governing Board about - how does it fit into the Foundation - reviewing the last 12 months and outputs - showing some of the different processes like establishing Working Groups, what Committees are, interactions with the Foundation - what next - how to get involved in open governance - take some questions Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/XDT3BL/

A whistle stop tour of Element’s progress over the last year! Highlights include Element Server Suite Community, the latest on Element X, Spaces, Threads and Element Call. There’s also Element Server Suite Pro, Synapse Pro and the launch of Element Pro; the Element app specifically for the workplace! Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/WEASKJ/

A thank you from the organisers. We hope you enjoyed your day! about this event: https://talks.python-summit.ch/sps25/talk/AZGSCP/

Our Lightning Talks are open to everyone 😊 about this event: https://talks.python-summit.ch/sps25/talk/EP7BNX/

Over the years, the lack of an array data type in Python has resulted in the creation of numerous array libraries, each specializing in unique niches but still having some interoperability between each other. NumPy has become the de facto array library of Python, and the other array libraries try to keep their API close to that of NumPy. However, this often becomes infeasible, and the libraries deviate out of necessity. To make Python's array libraries shake hands with each other without any inconsistencies, the Consortium for Python Data API Standards has formalised an Array API standard for libraries offering array creation and manipulation operations. The Array API standard allows users to write and use the same code for arrays belonging to any of the standard-conforming libraries. Through this talk, we will explore the need for such standardisation and discuss its salient features in detail. We will primarily delve into the example of using this standard to make specific parts of European Space Agency's Euclid space mission's code GPU and autodiff compatible. Besides cosmology, we will also take a look at a few other examples, mostly sourced from my experience working with and on several Python array libraries for scientific computing. Ultimately, the audience can expect to leave the room with the knowledge of both, the software engineering and the research side of the array API standard. about this event: https://talks.python-summit.ch/sps25/talk/B7GRMJ/

Open Source has never been easy, but doing Open Source in the Matrix ecosystem poses a unique set of challenges. Add the pressure of sustaining a company on top of that, and you quickly find yourself in uncharted, and often uncomfortable, territory. This talk reflects on the reality of maintaining open source projects in the Matrix universe, especially from the perspective of a business. It dives into the tension between openness and exploitation, when others take your work without contributing anything in return, undermining sustainability and motivation. Through real-world experiences and hard-learned lessons, this session will outline the structural and cultural issues that make it harder for corporate contributors to survive in the ecosystem. We'll look at why fair contribution is hard to enforce, how "Trittbrettfahrer" (free riders) hurt long-term progress, and what we as a community - maintainers, companies, and individuals - can do to shift the dynamic. Whether it's licensing strategies, community governance, or pushing for upstream responsibility, this talk will explore the imperfect but necessary mechanisms we need to keep Matrix open, but not exploitable. The goal isn't to complain, but to open up a grounded and honest discussion about sustainability, fairness, and the future of open collaboration in Matrix. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/QG8QQU/

It has been known since the 70s that developers tend to give very optimistic estimations. We prefer to have exact numbers, even if that means they are wrong most of the time. In research, developers admitted that they believe their managers will see them as less competent if they provide estimates with huge margins. But mathematically speaking providing a wider min-max interval means you will be right more often. So, maybe it isn’t really accuracy that businesses and people are looking for. Maybe estimates are needed for the sole purpose of risk aversion. Risk can be measured in other ways. Maybe it is time we stop estimating tasks left and right and instead start managing the project’s risk and customer’s expectations. about this event: https://talks.python-summit.ch/sps25/talk/7EKTCB/

See a demo of E2EE encrypted DMs in Bluesky powered by Matrix. We will highlight the simple user experience and other advantages of this approach to adding E2EE to Bluesky. By reusing Matrix for E2EE DMs in Bluesky, we not only offer a trusted and tested open source encryption stack but also allow users to later expand their usage beyond chat to other Matrix features such as E2EE voice, video and more. Alternate approaches to build E2EE from scratch in Bluesky will take many years to achieve feature parity with Matrix. Moreover the federated Matrix architecture can allow Bluesky users a BYOMA (Bring Your Own Matrix Account) option, that stands as a unique advantage, not available from any other social media. Matrix enthusiasts should be excited, as the adoption of this approach for E2EE DMs in Bluesky can significantly expand the Matrix user base, and draw in many more users to experience the richness of the Matrix ecosystem. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/AVAL3A/

With *Beyond Instant Messaging: Matrix in the Public Sector* last year, we presented FITKO and the German Federal Ministry of the Interior joining efforts to pilot a Matrix-based next-generation communication infrastructure for digital government services, with the goal to showcase end-to-end encryption, great usability and machine-readable communication between citizens and public authorities. Lets take another look at the project, what we have done since and what else there is to come for *reaching the German Government via Matrix* Visit our projet page for more details https://gitlab.opencode.de/fitko/matrix-g2x (currently in German) This project is part of a larger target architecture, see the earlier talk "Consolidating Germany’s administrative communication: Towards a joint Matrix-based architecture" by my colleague Dominik Braun. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/Q3LKTY/

Can Matrix compete with Big Tech? That remains an open question - but the market conditions in Europe have never been more favorable to sovereign, European software solutions. So how do we build commercially sound companies based on Matrix? This talk will focus on real-world use cases, showcase features built for public-sector customers, explore viable business models, and share hard-earned lessons from bringing Matrix to market. Agenda: 1. Why Meedio? Why Matrix? 2. Going open source - choosing the right business model 3. From proprietary to Matrix - evolution timeline 4. Technical integration journey - architecture overview 4.1 Meedio solutions 4.2 Meedio components infrastructure 4.3 MSC's used 5. KBV-Certified consultations - when Signal is not enough 6. Scaling federation and predictability 6.1 Vanilla Synapse 6.2 Desperation phase 6.3 Vanilla Synapse to ESS Pro 6.4 Synapse Pro (ESS Pro) 7. Demo Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/GX397V/

In this talk we will introduce Synapse Pro, the Matrix server for professional environments from Element. Synapse Pro is built to support professional Matrix deployments in terms of scalability, efficiency and high availability. It comes in two flavours, Synapse Pro for Small Hosts and Synapse Pro for Large Hosts. The Small Hosts solution introduces multi-tenancy capabilities in order to host plenty of small Matrix servers in a resource-saving and cost-efficient way. The Large Hosts solution enhances Synapse with more efficient implementations of its subsystems and provides auto-scaling as well as high availability capabilities. This talk will give you detailed insights on both solutions and their benefits for Element customers. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/AETNRS/

The BundesMessenger is the soverein communication solution for the German government and armed forces. Developed to be robust, secure and interconnected it serves as the basis for collaboration in the public sector. With a sharp focus on user experience, an uncompromised commitment to free and open-source software and state-of-the-art deployment of cloud technologies, it brings a high-quality messenger to firefighters, soldiers and office workers. Want to know what makes the BundesMessenger quite a special piece of software? Is it better than fax? And will it shut up after I call it a day? Join the talk to find out! Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/9HKYHA/

In many parts of the world, especially across Africa, software cannot assume a stable internet connection. From rural communities to field agents working in transit or enforcement, the reality is simple: offline is the default, and sync is a luxury. In this talk, we’ll explore how to build offline-first applications using Python — apps that work gracefully when the network doesn’t. Drawing from real-world civic and infrastructure projects scenarios in Nigeria, I’ll walk through techniques to queue, cache, and sync data locally, using tools like SQLite, Redis, Celery, and FastAPI. We’ll explore design patterns that prevent data loss, improve user experience, and simplify reconciliation once connectivity is restored. Whether you’re building field data tools, mobile dashboards, or lightweight IoT integrations, this session will equip you with the mindset and technical building blocks to ensure your Python applications stay resilient — no matter the network conditions. about this event: https://talks.python-summit.ch/sps25/talk/PBVN3P/

On July 15, 2025, Germany’s statutory health insurance funds will introduce the Matrix-based instant messaging service TI-M (Telematikinfrastruktur Messenger) into their electronic patient record (ePA) apps. This marks a significant milestone, as Matrix-based messengers will become potentially available to 74 million insured individuals across Germany. This talk will provide an overview of the nationwide rollout, highlighting the technical and organizational challenges faced during the development and operation of TI-M, including interoperability, security, and scalability within the highly regulated healthcare environment. We will present up-to-date usage data and insights on user adoption, reflecting the initial impact and acceptance of TI-M among patients and healthcare professionals. Finally, the session will offer an outlook on the future of secure, decentralized communication in the German healthcare system, discussing opportunities for further integration, innovation, and the broader implications for digital health infrastructure. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/SHDUM3/

Element Call, the flagship MatrixRTC application by Element, is shaping the future of secure, federated calling. As the successor to the traditional call system in Element apps, it now powers large-scale, end-to-end encrypted (E2EE) group calls with improved reliability and seamless federation support. This talk follows up on last year’s introduction of Element Call, showcasing a year of rapid innovation — from new media transport mechanisms to enhanced mobile features — all aimed at making secure communication effortless and intuitive. Last year, we introduced Element Call as the next-generation MatrixRTC solution for calling over Matrix. In 2025, it’s no longer just a promising beta—it’s the default call experience in Element apps and a key pillar of the Matrix ecosystem. This talk will cover the evolution of Element Call over the past year, including: - MatrixRTC in production: how Element Call is now the core calling experience in Element apps, replacing the legacy call stack. - Scalable E2EE group calls: supporting large encrypted calls with significantly improved reliability and federation support. - New transport layer: leveraging to-device messages for secure and robust end-to-end media encryption across calls. - A new MatrixRTC Transport using a Multi-SFU approach - Ease of use: new UX features like emoji reactions and background blurring. - Mobile-first features: introducing Handset Mode for more natural audio on mobile devices. Whether you're a Matrix developer, community member, or integrator, this session will give you an inside look at where MatrixRTC is headed and how to build on top of it. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/BQZHAH/

Are you writing nested loops when solving coding challenges? Discover how Python's functional programming toolbox can transform your problem-solving approach. We'll explore functional programming principles through the lens of Advent of Code puzzles, learning to think in streams of data rather than step-by-step instructions. We’ll explore some essential bits from `itertools`, `functools`, and `operator` modules, aiming to write more expressive, debuggable code. Starting with pure functions and lazy evaluation, we'll build up to solving real AoC problems using techniques like: `itertools.pairwise()` for sequence comparisons, `functools.reduce()` for data aggregation, `operator.itemgetter()` for elegant sorting, Generator expressions for memory-efficient processing. Through some puzzles from various years, we’ll see how functional approaches often lead to more concise solutions that closely mirror the problem description. We'll compare imperative vs functional solutions, highlighting pros and cons of both approaches. Whether you're preparing for coding interviews, tackling AoC, or just want to expand your Python toolkit, you'll leave with a couple more ideas for writing cleaner, more Pythonic code - no external dependencies required. about this event: https://talks.python-summit.ch/sps25/talk/PA7988/

Nobody likes fax machines, yet everyone still uses them – that's the reality in German hospitals. Since 2019, Famedly has been challenging this status quo. With our TI Messenger, built on the Matrix protocol, we've created a secure and decentralized alternative. Learn how we're using and extending Matrix to modernize communication in the German healthcare system. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/BBXTLT/

Looking for more resilience and sovereignty, the European Commission has been running a trial Matrix deployment. This talk will present some of the work done. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/MDHBPY/

Our project's main goal was to fill a gap by developing a telephony bridge that natively integrates XiVO enterprise telephony (based on SIP) within the alternative and open-source Matrix/Element ecosystem. Our focus with this bridge is to offer a credible and high-performing alternative to dominant proprietary solutions, such as Teams and its "Telephony System" licenses. XiVO SIP bridge project presented a significant development challenge, underscoring its disruptive and creative nature. This wasn't a simple assembly of existing technologies, but an engineering effort to bridge two fundamentally different protocols: WebRTC used by Matrix ecosystem and SIP from the IP telephony world. This bridge (built as a Synapse module for now) allows Element to integrate enterprise telephony capabilities provided by XiVO, open source IPBX using Asterisk. The integration approach between XiVO telephony and the Matrix protocol involved designing specific gateways and APIs for interoperability of identities (XiVO user vs. Matrix user, i.e., phone number vs. mxID) and telephony features (answer, hang up, hold, etc.) directly within the Element Web interface. The impacts, and outcomes of this successful bridge project are significant. It allows a substantial reduction in communication costs for businesses by eliminating proprietary telephony licenses, all within a single, open-source unified communication tool. It also creates value for the French and European open-source ecosystems. In short, the XiVO/Element bridge is not a mere improvement on existing solutions but a disruptive proposal that creates a "bridge" between the world of traditional telephony and modern unified communications. It, nevertheless, required solving complex problems: - How do you reconcile different protocols and semantics? The SIP protocol manages specific states and signals (e.g., INVITE for ringing, HOLD for putting a call on hold) that have no direct equivalent in the Matrix protocol. The difficulty lies in designing a mechanism capable of interpreting these SIP events, translating them into relevant Matrix events, and vice versa, to maintain a consistent user experience. - The bridge must be able to robustly track the state of these sessions and ensure that actions performed on one side (for example, rejecting a call in the web interface) are correctly executed and reflected on the XiVO PBX in SIP. A failure in this IPBX/Matrix synchronization could lead to inconsistencies (e.g., a call that still appears active on one side even though it has ended on the other). The idea is to use this presentation to share our progress on this bridge, its integration into our soft-fork of Element (xivo-connect) with a supporting demo, and our expectations to integrate it into Tchap (French gov soft-fork of Element). We also want to share our successes and ideas for the future to benefit the entire Matrix community. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/CYXHGK/

Last year, we introduced NeoToolSuite, Nordeck’s productivity suite of Matrix widgets designed for efficient collaboration and communication. This year, our focus shifts to our flagship product: NeoBoard Standalone. This real-time collaborative whiteboard matrix client has evolved through continuous development and iteration and now it features an immersive infinite canvas that redefines what’s possible for open-source productivity and creative tools. Join us for a tour of NeoBoard’s latest features and share our vision for the future of real-time collaboration, powered by the Matrix protocol. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/KHM9ZY/

The German public administration aims to consolidate its disparate solutions for G2C and G2B communications and transition to a unified yet decentralized Matrix-based infrastructure. In this talk we will dive into this new federal infrastructure’s target architecture and explore its key requirements, drivers and architecture decisions – including the crucial choice of Matrix as the E2EE communications layer. We further share key learnings from the accompanying political process and reflect on the challenges ahead in constructing, negotiating and implementing transition pathways to achieve change in the complex brownfield-environment of Germany’s administrative IT. Note: If you want something more hands-on, take a deep dive into our technical pilot project for Matrix-based G2C-communication in Germany by attending our second talk at this year's Matrix conference: https://cfp.2025.matrix.org/matrix-conf-2025/talk/Q3LKTY/ Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/L8LXQU/

European healthcare communication is at a turning point. Fragmented national systems are reaching their limits, while the need for interoperable, secure, and user-friendly digital spaces across borders continues to grow. This talk explores how the open-source Matrix protocol has become a strategic foundation for secure messaging in healthcare — powering derived solutions like TI Messenger and CGM Messenger. Our approach highlights not only the technology itself but also the importance of collaboration with the open-source community, especially through our partnership with Element, to drive innovation, scalability, and trust. Key themes include deep integration into primary systems, the use of headless clients, and tackling challenges around usability, eID identity models, and technical complexity. We argue that while Matrix alone is not the silver bullet for interoperability, it provides the missing bridge between siloed infrastructures and the vision of a unified European Health Space — rooted in open standards and coordinated implementation. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/GDWSJR/

Why should you, as a Python developer, learn Rust? In this talk, we will explore Rust's compelling answers to this question. Rust offers guaranteed type safety and memory safety without a garbage collector, "fearless concurrency", and incredible performance. We will look into some of Rust's most distinctive features from a Python perspective, including its strict compiler, the ownership and borrowing system, null safety via `Option<T>`, and explicit mutability. We will discover how Rust eliminates common runtime errors at compile time, and additionally, how understanding the concepts behind Rust's safety features can sharpen your Python skills, helping to write more robust and reliable code. By the end of the talk, you'll understand Rust's core value proposition and how its paradigms can benefit you, whether you are writing Python, Rust, or any other language. about this event: https://talks.python-summit.ch/sps25/talk/WDJ3WU/

Bytecode, the internal language of instructions used by the interpreter is something that perhaps most Python developers have heard about, but few have dug into. This talk will try to explain the idea behind bytecode and how it works. We will see how to extract bytecode from functions - with `dis` module, and from `.pyc` files (and what is the idea of `__pycache__` directories). Then, the other way around: we’ll check the possibility of building new functions with raw bytes in runtime. about this event: https://talks.python-summit.ch/sps25/talk/9NWPB9/

Twenty seconds is a long time when someone can’t breathe. At ESA´s LUNA Analog Facility we turned that reality into a design constraint: a moonwalk emergency with voice cut by design, Matrix/Element carrying clinical guidance across a built-in one-way delay. We tested two styles of instant messaging, open free-text versus a tiny, structured grammar, to coordinate assessment, treatment, and evacuation over a delay-tolerant (store-and-forward) network. The first signals are clear: structure lowers cognitive load and keeps decisions moving even when replies arrive “late.” We’ll share what worked, what didn’t, and how the same patterns translate to Earth during hospital IT outages. With publications in progress, this talk focuses on early signals and the method itself, showing how Matrix enabled care under delay and how small changes could improve resilience. We start with a quick introduction of the LUNA Analog Facility, why a Moon-like regolith hall, ground segment, and “moonwalk” simulation are ideal for testing communications under stress, then walk through our method: we intentionally disabled voice, enforced ~20-second one-way delay, and coordinated clinical care entirely over Matrix/Element on a delay-tolerant (store-and-forward) link. You’ll see how we compared open free-text with a compact, structured chat grammar and which small conventions, clear end-markers, role tags, micro-acks, bounded message size, simple priority cues, reliably reduced ping-pong and cognitive load while keeping treatment safe. From there, we look beyond the Moon: practical takeaways for Earth hospitals facing outages (offline-first clients, lightweight message grammar for critical steps, prebuilt templates), and EVA-oriented tweaks that seem promising, such as lightweight clinical field sets and mobile/edge Matrix homeservers with opportunistic federation under delay. Publications are in progress; this session focuses on the method and early signals and what they imply for building resilient, message-driven care when “real-time” isn’t guaranteed. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/PUUXDL/

In this presentation, we will examine processes within the German healthcare system and explore the underlying structural challenges that make intersectoral communication so difficult. We will discuss why Matrix is the ideal protocol for the foundation of this infrastructure and explain how we build upon the Matrix specification to meet healthcare-specific requirements. Special insights will be shared regarding the challenges and lessons learned during the implementation of the TI-Messenger in Germany’s healthcare system. The presentation will outline the different stages of development and highlight specific use cases that demonstrably improve the quality of care. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/QGQX9L/

MLS and Matrix don't mix well. But why is that and what can we do about it? Since I got to touch that area a bit, I'll try to give some answers, but don't expect solutions. We will be looking how MLS and Matrix work internally, how a tree is a DAG but a DAG not a tree and maybe we will have some glorious idea or get frustrated. No promises! Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/Z9B878/

In this talk, we’ll take you through the real-world journey of developing and approving a TI-Messenger - a secure, interoperable messaging application built on top of the Matrix protocol for use within Germany’s healthcare system. What began as am idea soon grew into a tightly regulated, multi-stakeholder project, with high demands on privacy, trust, and compliance. This session is less about features and more about transformation. It’s a case study of how we shaped a Matrix-based messenger to meet the strict security, interoperability, and governance requirements defined by the gematik specification, and how that shaped our development process in return. Unlike general-purpose Matrix clients, the TI-Messenger is deeply constrained by legal frameworks, security audits, and standardized certification making the path from concept to approval full of unique challenges. We’ll reflect on what we learned about applying Matrix in high-trust environments, what we would do differently, and how our experience could inform similar efforts elsewhere. Whether you’re working in the public sector, healthcare, or simply curious how Matrix can scale to more regulated use cases, this talk offers an inside look at what it takes to make Matrix meet mission-critical standards. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/YMCDE7/

For decades, government agencies have relied on proprietary, siloed communication systems. Today, several Swedish initiatives are exploring new paths forward. First, we will provide details on the latest developments within SAFOS, a service designed to establish a potential national standard for secure messaging, video conferencing, and real-time collaboration. Second, we will share insights from eSam — a voluntary collaboration between public agencies — where a multi-agency task force is evaluating options for a common, open, and federated protocol for real-time communication. We will discuss our evaluation criteria, the challenges, and the potential of solutions such as Matrix to foster true interoperability, decentralization, and robust security for Sweden's public administration. Join us to learn how Försäkringskassan and eSam are exploring ways to build a future-proof communication infrastructure based on openness and collaboration. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/DZBGLP/

Code review is a central part of everyday developer jobs. The motivation to create this talk was a quote: “The most important superpower of a developer is complaining about everybody else's code.” In this talk, I’ll explain my approach to better code review. Sometimes, it’s hard to convince a colleague about change or don’t change some lines of code. In my talk I would like to cover some best practices from my software engineering experience about efficient and honest code review. How to create a culture of perfect code review. How to apply automatic tools to improve code review routine of repetitive comments or suggestions. How to write/or reuse coding style guides for your team to reduce the time spent arguing about naming conventions and different styles. What needs to be automated and what needs to be not automated during code review? The key role of patterns that can be reusable is not to confuse colleagues. about this event: https://talks.python-summit.ch/sps25/talk/ESM3K7/

Since 2024, the Swiss federal government has been obliged by the new EMOTA law to publish all its software under open source licenses. This new 'Federal Act on the Use of Electronic Means to Conduct Official Tasks' (EMOTA) has had an impact on IT procurement and open source activities in Switzerland. By encouraging the creation of open source communities, the law reduces vendor lock-in and strengthens digital sovereignty. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/KCKEYJ/

[matrix] as an end-to-end encrypted communication standard has its flaws. Flaws in privacy, flaws in complexity. With the standard of Messaging Layer Security (MLS), the [matrix] ecosystem has the opportunity to address old flaws, rethink room state and increase interoperability. In this talk, I will provide a beginner's guide on challenges of [matrix] 3.0. > Messaging Layer Security (RFC 9420, MLS) is a modern layer for end-to-end encrypted group messaging providing Forward Secrecy (PFS) and Post-Compromise Security (PCS). MLS further provides performance that’s logarithmic in the group size, an easy migration to post-quantum security, and is a rigorously analyzed protocol. This talk will discuss the opportunities and challenges offered by MSC4256 proposing a way to integrate MLS into [matrix] rooms. As a guidance, I will focus on the following questions : - Which advantages does MLS feature over Olm ? - Which tradeoffs can we accept with an interoperable encryption standard ? - How can we keep a federated ecosystem working with an encryption standard not meant for complete distribution ? - How can we ensure to keep sync of MLS state and [matrix] room state ? - How can we incrementally migrate an ecosystem to another encryption standard ? The entire topic of MLS is obviously too big for a single talk. Many of the open questions may only be discussed briefly. The aim of this talk is not to present outstanding solutions like a miracle but rather to inform about the current state of the specification, the ecosystem and next steps. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/BAKSEA/

With the TI-Messenger, built on the Matrix protocol, Famedly has enabled secure and interoperable communication across the German healthcare system, from hospitals to pharmacies. Adoption is growing rapidly, with millions of potential users on the horizon. In this opening talk, we’ll look back at TIM’s journey so far, highlight its impact and adoption, and then take a step beyond healthcare into the government. We’ll also give a glimpse into MLS and how it will strengthen security and interoperability for all Matrix-based applications in the future. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/XTTQ3R/

Sometimes getting an approximate answer is super good enough. How do you check for duplicates, count unique users, or track item popularity when your dataset won’t fit in memory? Enter probabilistic data structures like Bloom filters, Count-Min Sketches, and HyperLogLog! This talk introduces these powerful tools, demonstrates simple implementations in Python, and gives you ideas on when to use them. Walk away ready to apply these techniques in your own projects - no advanced math required. about this event: https://talks.python-summit.ch/sps25/talk/QBXDUQ/

A welcome message and useful information from the organisers. You will also find useful information on our [website](https://www.python-summit.ch/). Or feel free to ask any member of staff if you have a question. about this event: https://talks.python-summit.ch/sps25/talk/LL3K3L/

As project lead of Matrix, Matthew gives a snapshot of where the project is at. Highlights should include: * Overview of recent high-profile Matrix deployments and uptake * Overview of the recent major projects to fix state resets and improve decentralisation reliability * Overview of making Matrix a safer place via improved Trust & Safety work * Progress on Matrix 2.0 MSCs (Next Gen Auth, Sliding Sync, MatrixRTC) and uptake * Progress on Olm/Megolm improvements (history sharing, TOFU, invisible crypto, etc) * Progress on Next-generation encryption work ...and more! Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/8PEMJB/

This session will present the latest updates from the Foundation itself, and the progress it has made in standing on its own legs during the last year. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/3RXLTQ/

Welcome Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/CL3HJB/