Represented on the Ceph Executive Council and the board of the Ceph Foundation. We inject European enterprise and compliance requirements directly into upstream development.
About us
Open Source Commitment
Why Open Source is Part of Our DNA
„When I founded CLYSO in 2010, the motivation was clear: open source provides organizations with the technological freedom and architectural control that proprietary systems deny. For us, free software is not a business model we adopted down the road – it is the very origin of our company.“
„We continuously invest in the global ecosystem to ensure that our customers' storage architectures and infrastructures remain vendor-agnostic, transparent, and maintainable for the long term.“
— Joachim Kraftmayer, Founder & CEO
CLYSO in Open Source Storage
Code quality and community leadership are measurable facts for us. We continuously invest in the upstream project as well as enterprise-ready solutions.
4
Active Ceph Ambassadors
Official representatives of the Ceph community.
15+
Years of Open Source Expertise
Long-standing experience in development and operations.
Diamond Member of the Ceph Foundation
Represented in the leadership of the Ceph Foundation.
+ 75%
Engineering Share in the Team
Focused on technical excellence rather than sales.
5200+
Upstream Commits (since 2010)
Direct contribution to the ongoing development of Ceph.
Strategic Responsibility in Project Governance
Enterprise-grade open-source infrastructure requires dependable structures. CLYSO does not view itself merely as a consumer; we take on active co-responsibility for the entire Ceph ecosystem.
Sustainable Knowledge Transfer
We transparently share code, benchmarks, and migration utilities—such as Chorus, an open-source project initiated by CLYSO—directly on GitHub.
Community Stewardship
As organizers and speakers at KubeCon, Ceph Days, and FOSDEM, we actively drive the global dialogue on software-defined storage.
Our Engineering & Ambassador Team
The minds designing your architectures work at the core of global open-source development.
Joachim Kraftmayer
Founder & CEO, Ceph DACH Ambassador
Founded CLYSO in 2010 out of a passion for data sovereignty. Actively represents European enterprise and public sector interests within the Ceph ecosystem.
Dan van der Ster
CTO & Ceph Executive Council Member
Former CERN architect for multi-petabyte storage systems at the LHC. Leads the overall technical and architectural strategy at CLYSO.
Mark Nelson
Head of R&D, Ceph Performance Lead
Long-time core Ceph engineer (formerly Red Hat). Focuses on performance R&D and spearheaded the community's journey to 1 TiB/s.
Frédéric Nass
Ceph Engineer & Ambassador (Frankreich)
Specialist in large-scale Ceph clusters and modern cloud infrastructures across European research and higher education.
Deepika Upadhyay
Ceph Engineer & Ambassador (Indien)
Core contributor to Ceph and Rook, specialized in observability, telemetry, and distributed tracing in complex environments.
Joshua Blanch
Ceph Engineer & Ambassador (Canada)
Expert in cloud-native and bare-metal infrastructures, connecting North American enterprise requirements with core upstream development.
Engage with Our Community
Our engineers and ambassadors regularly share their expertise at global tech conferences and industry events.
Part of the Ceph Open Source Community
Active contributors to the Ceph ecosystem and members of leading open-source foundations.
Looking to build your data infrastructure on a truly vendor-agnostic foundation?