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/

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/

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/

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/

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 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/

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/