Lisa Seifert has been a project manager in the OSBA's SCS Standards Forum since June 2025, where she drives the further development of standards and brings together stakeholders from various sectors. Previously, she was actively involved in the open source community and uses her experience in organisational development, communication and marketing to strengthen the visibility of open source and digital sovereignty.

Anja Voß, project manager at DigitalHub.SH, is committed both professionally and privately to networking and learning from each other as equals in order to strengthen a digitally sovereign administration and society. For her, SCS stands for a strong, open community that actively shapes and promotes digital sovereignty.

As founder and COO of Syself GmbH, Janis Kemper is modernising the European cloud infrastructure with intelligent software solutions. With Syself and SCS, he wants to create real alternatives to large American corporations - with the help of open standards, user-friendly products and modern technology.

Ralph Dehner is the founder and managing director of B1 Systems. For more than 20 years, he has been passionately committed to the worldwide use of open source. With around 200 employees, B1 has been implementing OpenStack Cloud environments for companies and public institutions since 2011 and is a spokesperson for the OSBA's SCS Standards Forum for digital sovereignty.

Alfonso Cancellara is a Technical Account Manager at Red Hat, specialising in OpenShift and the cloud-native ecosystem. A vocal advocate for the "Open Source Way", Alfonso expertly bridges the gap between enterprise-grade stability and community-driven innovation.

Jan has been active in the open source sector for over 10 years. Starting with the OpenStack and Chef ecosystem for building cloud environments in Germany, he has spent the last 6 years focussing primarily on open networking and the telecommunications sector. Since October last year, he has been working for OSISM and, as part of the SCS Project Board, is trying to promote the use of open source software and the concept of OpenOperations to strengthen digital sovereignty.

Dr Daniel Gerber holds a doctorate in computer science. As CTO at Targomo GmbH, he was responsible for global IT services before becoming a member of the Saxon state parliament in 2019, where he fought for digital sovereignty. Since 2025, he has continued his commitment to free software at ALASCA as a software engineer and as Deputy Managing Director of the Open Source Business Alliance.

Kurt Garloff, CEO of S7n Cloud Services GmbH and SCS project initiator as well as part of the SCS Project Board, sees open source technology as an opportunity to work with the best developers worldwide and build innovative platforms that he and the users can control and design themselves. He was able to realise this motivation with SCS for cloud and container platforms.

Felix is head of the Sovereign Cloud Stack (SCS) and project manager of ECO:DIGIT at the Open Source Business Alliance (OSBA). In these roles, he drives the development of sovereign cloud infrastructures and actively shapes the further development of open digital ecosystems. He works closely with the community, companies and public stakeholders to promote sustainable and interoperable solutions.

Marvin has been working as a Standardisation & Certification Engineer in the Forum SCS Standards team since June 2025, with a focus on implementing and further developing certifications. With his background in computer science and research on semantic web and linked (open) data, he is particularly committed to digital sovereignty through open standards, data and free software. In addition to his technical expertise, he brings political experience and voluntary work as a Leipzig city councillor to help shape an open and self-determined digital future.

Johannes connects leadership with technology. Based on his experience as a developer and cloud engineer, he is an active open source contributor and regular speaker and author in the tech community. With Cloudogu, he has been making digital sovereignty simple for over a decade.

Christian Schwaller is Head of Sales at artcodix GmbH and is also responsible for project management and consulting. With his many years of experience, he combines strategic sales with practical implementation.

Christian Berendt is the founder and Managing Director of OSISM. With his many years of experience with OSS and IT infrastructure, he is helping to make Europe a little more digitally sovereign.

Michel Raabe has been specialising in IT and network technology for over 15 years. In recent years, his interests have increasingly shifted towards the cloud, clusters, high availability and virtualisation. He has been working at B1 Systems GmbH since 2008 and has been a Cloud Solution Architect since 2018.

Christoph Streit is Managing Director of ScaleUp Technologies and, as a co-founder, has helped shape the company in various technical and commercial roles from the very beginning. He combines in-depth knowledge of hosting solutions and the latest cloud technologies and ensures the continuous development of the company.

Head of department „IT Research and Project Support“

Lena is employed at the IT Centre of RWTH Aachen University and works as project manager for the project in NRW. She is part of the three-person Kube3 organisation team and is responsible for public relations work for the cooperation. Within the IT Center, she provides organisational support for other projects in her "Systems and Operations" department.

Joachim Kraftmayer is the founder and Managing Director of CLYSO GmbH, a leading specialist for open source storage solutions and multi-cloud strategies. As a recognised authority in the field of software-defined storage, Mr Kraftmayer can look back on a career spanning over 25 years in the field of open source technologies. He is an experienced Ceph expert and has been working hands-on with this technology for more than a decade. His passion for open source solutions and their potential to enable scalable, cost-efficient cloud architectures inspired his entrepreneurial journey.

Mario Listes is a sales expert in the IT industry with an in-depth specialisation in the public sector. He has been advising and supporting public sector clients since 2017, gaining extensive experience at well-known technology companies such as Bechtle, IONOS and Pure Storage. Since the beginning of this year, he has been contributing his expertise to CLYSO, where he is responsible for business with customers from the public sector.

Stefan Majer has more than 25 years of experience and plays a key role in shaping the technical vision and innovation strategy of x-cellent technologies. Under his leadership, numerous complex IT projects have been successfully implemented, and he also initiated the open source project metal-stack.io to transform data centres into private clouds.

Matthias works at ALASCA e.V. as project manager for the FOCIS project (Free and Open Cloud Initiative Saxony, co-financed by the Free State of Saxony), which aims to further develop and disseminate open source cloud technology. He has been contributing to SCS efforts in the area of standardisation and certification since April 2023 and has been coordinating the corresponding Special Interest Group since November 2023.

Matthias started developing application software at a young age. Server and network administration followed shortly afterwards. He has now been working in data centres in the Unix/Linux and database environment for over 25 years and mainly develops software for administrators. In 2022, he and his team founded UhuruTec to make open source-based cloud platforms more accessible to customers.

Maria Vaquero has been with Cloud&Heat Technologies for five years and currently leads the Business Development & Marketing team. In her role, she contributes to the expansion of partnerships, the development of new business opportunities and the implementation of communication measures around sovereign and sustainable cloud infrastructures. She has a background in engineering and a PhD in innovation management.

Sarah Günther has been working in Business Development & Marketing at Cloud&Heat Technologies for seven years and supports communication around sovereign and sustainable cloud infrastructures - from external communication to close cooperation with customers and partners, in which topics are jointly developed and designed, to product management. Prior to this, she gained experience in the PR and marketing industry, including in a Berlin agency in a political context.

Martin Seebe is a Senior Consultant for Platforms, Infrastructure & Technology with many years of responsibility for the development, transformation and security of central IT and cloud infrastructures. He has designed and managed strategic infrastructure and platform initiatives, established governance and architecture structures and implemented regulatory requirements (including BSI-C5).

As a system engineer at UhuruTec AG, Jan Schoone works on a Kubernetes-as-a-Service product that uses SCS standards to realise the ability to switch to and from other SCS-compliant container platforms. Previously, Jan worked as a product owner for the container layer in the SCS funding project and continues to be responsible for its further development on the project board.

Daniel has been involved in the operation of servers in data centres for almost 20 years, especially in the environment with Linux and open source services. He has been working at Körber Pharma Software for 6 years and has been involved almost exclusively with OpenStack ever since. Daniel has been primarily responsible for the OpenStack clusters there for 3 years.

Chris is a Senior Platform Engineer at teuto.net and Kubestronaut. He has been working with Kubernetes for around 6 years and is intensively involved with fully automated and separated Kubernetes clusters (on OpenStack), which he develops at teuto.net.

Karin Vosseberg has been a professor in the Department of Computer Science at Bremerhaven University of Applied Sciences since 2009. She specialises in software engineering with a focus on software quality. She is particularly interested in the question of how sustainability and digital sovereignty can be anchored as non-functional quality criteria in software development. She is head of the Computer Science and Business Informatics degree programmes.

Matthias Burgfried works in the DSI1 unit of the Germany Stack department at the Federal Ministry for Digital and State Modernisation, where he is responsible for digital sovereignty in the Germany Stack, among other things.

Luise Kranich heads the Technology Strategy and Information Technology department at the Federal Office for Information Security (BSI). Previously, she was responsible for central topics such as framework architecture, standardisation and digitalisation programmes in the context of the Online Access Act at the Federal Ministry of the Interior and for Home Affairs (2022-2025). She combines strategic technology expertise with practical experience from research, non-profit and start-up environments at the interface of digitalisation, administration and security.

Dr Kai Martius has been part of the extended management team of secunet Security Networks AG as CTO since 2015 and has been a member of the Management Board since 2019, where he is responsible for technology, development, product management and certification. Prior to this, he worked for many years in management positions, including in the high-security and public sector, as well as in consulting and product development. He is regarded as the driving force behind the SINA security architecture and has many years of experience with security solutions for the public sector.

Joachim Astel is co-founder and CEO of noris network AG and is responsible for Human Resources, Security and Compliance. Since the company was founded in 1993 as one of the first Internet providers in northern Bavaria, he has played a key role in shaping its development. His focus today is on IT security, the automation of business processes and personnel management.

Miriam Seyffarth has been Head of Political Communications at the Open Source Business Alliance since February 2022. She previously worked as a research assistant and office manager for Tabea Rößner, a member of the German Bundestag, where she was responsible for various federal digital policy issues. She studied history, philosophy and Islamic studies and has been using open source software almost exclusively in her private life since 2005. She was active in the Pirate Party until 2014.

Lea Beiermann is Partnership Lead at the Centre for Digital Sovereignty and is responsible for the strategic development and maintenance of partnerships between the public sector and the open source ecosystem in Germany and Europe. She holds a PhD in the history of technology from Maastricht University and has extensive experience in adult education, corporate and technology communication as well as community and partner management.

Anja and Lisa welcome you to the Summit and open the day together. They will give you a brief overview of the programme and important organisational information to help you get your bearings. So you are well prepared for an inspiring and successful Summit.

To kick off the SCS Summit, the speakers of the SCS Standards Forum and the head of the forum will provide an overview of the current status of the Sovereign Cloud Stack - and show why now is precisely the moment in which the future is being created. They highlight the milestones that have already been reached - from standards to certifications - and how these have created a solid foundation for the next development phase. The role SCS plays for digital sovereignty and open cloud infrastructures is also categorised. In this way, the article sets the tone for a summit that makes the current status tangible and visualises the importance of SCS in the overall picture.

Where does the German stack stand today - and what's next? The BMDS provides an insight into the current status. What has been achieved so far, where are there still challenges and what are the next steps?

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Why do we need more and more standards and sovereignty criteria in the cloud environment - and where do end users actually gain added value? What concrete benefits do approaches such as SCS, C3A and other frameworks for sovereign cloud computing deliver, and what added value do users actually need to derive real benefit from them? The panel will discuss the benefits, limitations and interplay of current standardisation initiatives from the perspective of the public sector, security authorities, industry and the open source ecosystem - and thus kick off the content of the conference day. Miriam Seyffarth will moderate the panel.

The topic of digital sovereignty through open source as a basis for sustainable systems has been gaining momentum in recent months. Especially in times of uncertain political developments, publicly discussed examples, such as the consistent open source strategy in Schleswig Holstein or Berlin, show the possibilities of breaking away from dependencies on large tech companies. In March 2026, the IT Planning Council made the standards of the Sovereign Cloud Stack (SCS) mandatory in the German stack, thereby setting the course for the future. In order to fulfil the promise of strengthening digital sovereignty through open source software and developing sustainable systems, we need well-trained IT specialists who want to help shape society responsibly. In addition to internalising well-understood basic techniques in software development with a focus on the quality of software, discussions about the scope for design and responsible action are important aspects of higher education. In the lecture, we want to present our ideas for discussion on how we can shape the study culture in computer science and business informatics at Bremerhaven University of Applied Sciences with the triad “Digital Sovereignty - Open Source - Sustainability”. Behind this „we" are three professors at Bremerhaven University of Applied Sciences: Prof. Dr.-Ing. Oliver Radfelder (focus on sustainable software architectures), Prof. Dr.-Ing. Ulrike Erb (digital sovereignty and sustainability in IT) and Prof. Dr.-Ing. Karin Vosseberg (software quality, head of the Computer Science and Business Informatics degree programme), who will present the lecture.

Pitches in the foyer: 13:00 - Yorizon GmbH & Co. KG Hendrik Peters, Business Development Manager SaaS and Platform 13:15 - secunet Security Networks AG Michael Moritz, Head of Cloud Engineering

DATEV is the largest IT service provider for tax consultants, auditors and lawyers in Germany. An SCS-compliant IaaS cloud platform has been in production there since 2025, to which all IT services will be gradually migrated over the next few years. One requirement is to build a fully GitOps-managed platform, which is why uStack from UhuruTec with YAOOK was chosen. Martin Seebe (DATEV) and Matthias Haag (UhuruTec) report on how this came about and the challenges that had to be overcome.

The current AI revolution often takes place within the „black boxes“ of large, international providers. But how can businesses and public authorities retain full control over their data and models? In this talk, we present the Sovereign Cloud Stack (SCS) as a solution to the reliance on proprietary systems. We demonstrate how the use of the SCS bridges the gap between powerful AI and digital sovereignty. Discover how a standardised open-source infrastructure enables computationally intensive applications such as language models (LLMs) to be run flexibly, securely and independently of any specific provider. The talk illustrates that true technological independence need not be a compromise. Through the right combination of open standards and modern orchestration, we are creating a European ecosystem that unites innovation and data protection. A guide for decision-makers and strategists who are actively and independently shaping the future of AI.

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As integrators and cloud service providers, Cloud&Heat, OSISM and UhuruTec have helped to develop the standards from the SCS and bring them into productive environments. We start this panel with representatives of the three companies with the question of why they, as direct competitors in the same market, nevertheless work together in the SCS forum and in the open source ecosystem. We will shed light on the technological differences and discuss what experience has been gained with the SCS standards in recent years, what requirements customers have today and what role the SCS will play in the future. Finally, we take a look at the first resolutions of the IT Planning Council on the German stack and analyse the implications these will have for the IT landscape in Germany. Daniel Gerber (in his role at ALASCA) will moderate the panels.

The SCS reference implementation relies on OpenStack as the IaaS foundation. But what if physical client separation, native hardware performance or KRITIS suitability are required? metal-stack.io shows that there is another way - and that it can enrich the SCS ecosystem. metal-stack.io is an open source project that delivers Kubernetes-as-a-Service directly on bare metal - without a hypervisor layer. Developed in the strictly regulated financial sector at Finanz Informatik Technologie Service (FI-TS), metal-stack has been managing a fleet of over 1,500 servers there since 2020. metal-stack.io is part of the NeoNephos Foundation. metal-stack.io is currently being evaluated by various potential users from the energy sector. We are formulating an open dialogue offer to the community: How can the SCS standards be designed to be sufficiently technology-open to also map alternative IaaS approaches, and what role can bare metal play in the German stack? A short live demo of the metalstack.cloud on-prem starter will round off the presentation. This presentation is not intended as a counter-proposal to the SCS, but as an impulse for more diversity in the ecosystem - and as an invitation to collaborate.

It is well known that an SCS-compliant OpenStack can be provided using Yaook (see, for example, the ALASCA Tech Talk from January 2026). However, establishing conformity requires additional effort effort, which is manageable but not negligible. And errors that affect conformity cannot be ruled out during further operation. We therefore propose a Yaook operator that automates many parts of both achieving and ensuring SCS compliance. automated. In this Lightning Talk, we will present the current status of the operator, show what it can do for you, and which improvements are still possible.

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In which city did the group that gave birth to the SCS idea meet? Serious and less serious questions like these are asked in a quiz show and shed light on the goals, history, successes and misfortunes of the SCS initiative from its inception to the present day.

The SCS certifications are ceremoniously presented during the Certificate Award Ceremony. The award-winning companies receive their certificates in a special moment on stage. Together we celebrate this important milestone and the successful completion.

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SCS implements cloud technology with freedom of choice and the goal of digital sovereignty. More and more SCS-certified cloud service providers are currently emerging. The next step is to work with software providers to extend the freedom of choice and sovereignty of SCS to end users. Because the real value of the entire stack only becomes apparent there. In our talk, we would like to present such a holistic open source stack: Based on Cloud&Heat's SCS-certified OpenStack infrastructure, the Cloudogu EcoSystem as an operating platform for tool stacks extends sovereignty directly to the end users. Together, we enable the use of modular, integrated tool stacks (such as project management and software development) on any infrastructure. This makes it possible to switch between tool providers and infrastructure operators - as required by the German stack, for example - a reality.

Cloud infrastructure on bare metal requires the interaction of numerous components - from inventory to network to deployment. The complexity increases in air-gap environments. The Metalbox addresses this: As a management node, it combines all services in one solution. The central feature is the L3 approach: provisioning via Redfish Virtual Media - without PXE or DHCP. VRF separation and BGP routing with FRR ensure network separation. A local artefact mirror provides images and packages offline. Based on OpenStack Ironic, NetBox and OSISM, the Metalbox integrates provisioning, inventory, DNS and routing - automated with Ansible. SONiC optionally supplements the switch management. Yorizon, a European cloud provider that operates a growing network of YEXIO data centres, will be presented as a concrete use case - with a clear focus on sustainability and digital sovereignty.

Pitches in the foyer: 13:00 - Yorizon GmbH & Co. KG Hendrik Peters, Business Development Manager SaaS and Platform 13:15 - secunet Security Networks AG Michael Moritz, Head of Cloud Engineering

An OpenStack move sounds simple - after all, it's both OpenStack, right? The reality is different. This presentation shows the migration path from Red Hat OpenStack to a new OpenStack (based on OSISM). The specific challenges will be highlighted: Differences in deployment architectures, network redesign, data transfer from VMs and volumes and the pitfalls of migrating running workloads. when migrating running workloads. In addition to the problems, the focus is on solutions - and why the effort is worth it: an open, community-driven deployment with OSISM, full control over the infrastructure and the advantages and the advantages of the SCS ecosystem as a future-proof basis for sovereign cloud environments.

This presentation introduces an open-source cluster API control plane provider that runs Kubernetes control plane components as pods on a shared management cluster. This significantly reduces costs compared to dedicated VMs per cluster, accelerates updates - as pod rotation is significantly faster than VM replacement - and improves security because the control plane infrastructure is completely out of the customer's control. We show how the Gateway API routes tenant traffic, manages cert-manager certificates and (Cilium) Network Policies ensure automatic isolation per tenant. Built-in OIDC federation, automated etcd backup/restore and OpenTelemetry observability work right out of the box - without proprietary dependencies, fully declarative and GitOps-friendly.

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Running a Kubernetes-as-a-Service solution is no easy task. The cluster lifecycle needs to be automated, all cluster components must be configured, and users require various features to run their applications – particularly databases. At Syself, we have been operating a Kubernetes platform based on the SCS Cluster Stack Framework for 2.5 years. We would like to share insights into how we operate our clusters, the typical challenges we face, and how we manage to run high-performance databases based on open-source software in Kubernetes. At Syself, we have been running a Kubernetes platform based on the SCS Cluster Stack framework for 2.5 years. We want to provide insights into how we operate our clusters, what we consider to be common issues, and how we manage to run high-performance databases in Kubernetes based on open-source software.

The Kube3 project is an initiative of the federal states of Bavaria, Baden-Württemberg and North Rhine-Westphalia that aims to ensure the long-term sovereign use of infrastructures at universities. The aim of the cooperation is to set up KaaS systems at various university locations in the three federal states, which can then be used in a B2B relationship by other universities and services provided throughout the state. Within this project, the heterogeneous structures and setups must be taken into account without neglecting the requirement for a common standard. The common vision is to provide a federated KaaS system for universities of universities that functions independently of the underlying conditions. The SCS offers a meaningful orientation on how standards can be developed and work together in practice. The aim of the presentation is to make the stakeholder group of universities and their challenges within the community visible.

Data is the lifeblood of modern IT infrastructures - but how do you store, scale and orchestrate it efficiently in a cloud-native world? In this session, we take a deep dive into the world of Ceph, the highly scalable, distributed storage system, and Rook, the leading Kubernetes operator for storage. But we won't leave it at grey theory: we'll take an exclusive look behind the scenes of open source development. What does it really mean to be responsible as a maintainer for projects of this size (and with a CNCF qualification)? Between code reviews, architecture decisions and community management, you will find out first-hand how the future of cloud-native storage is being actively shaped.

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