Open Source Summit Europe 2025: Full Schedule

25-27, August 2025
Amsterdam, Netherlands
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Note: The schedule is subject to change.

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This schedule is automatically displayed in Central European Summer Time, CEST (UTC +2). To see the schedule in your preferred timezone, please select from the drop-down menu to the right.

IMPORTANT NOTE: Timing of sessions and room locations are subject to change.

11:20 CEST

The Hypervisor Hierarchy: Why Architecture Matters for Performance, Security, and Flexibility - Cody Zuschlag, Xen Project (Linux Foundation)

Monday August 25, 2025 11:20 - 12:00 CEST

G001-002

Not all hypervisors are created equal. Some claim to be "bare metal" but rely on an underlying OS, while others truly separate hardware from workloads, enhancing security, stability, and performance. This session breaks down the differences between Type 1 and Type 2 hypervisors, why some architectures blur the lines, and how Xen stands apart as a true, independent Type 1 hypervisor. We’ll explore how Xen can run with dom0 or dom0less, offering flexibility for both dynamic and fixed VM environments. We’ll also discuss how Xen’s streamlined, unified ecosystem avoids the fragmentation seen in other virtualization stacks. Attendees will leave with a clear understanding of why hypervisor design matters and how it impacts security, efficiency, and long-term infrastructure choices.

Speakers

Cody Zuschlag

Community Manager, Xen Project (Linux Foundation)

Cody Zuschlag is the Community Manager for the Xen Project and a passionate advocate for open-source solutions. Since 2022, he’s been speaking internationally on full-stack, embedded, and decentralized technologies. Through his work, talks, and teaching, Cody promotes using tech... Read More →

Monday August 25, 2025 11:20 - 12:00 CEST
G001-002

Cloud & Containers

Audience Experience Level Intermediate

13:30 CEST

Mainframes Aren’t Dead, They’re Just Running Kubernetes Now - Josephine Pfeiffer, Red Hat

Monday August 25, 2025 13:30 - 14:10 CEST

G001-002

Mainframes have been declared dead more times than JavaScript frameworks have been invented—but here they are, still running the backbone of global finance, government, and enterprise computing. And now? They’re running Kubernetes too.

This talk dives into the why and how of running Kubernetes on mainframes, from containerization on z/OS to networking, workload orchestration, and real-world use cases. We’ll break down the challenges, the benefits, and whether this is a clever hack or a genuinely viable approach for modern infrastructure. If you think mainframes are relics, think again—because they’re running microservices now.

Speakers

Josephine Pfeiffer

Senior Consultant, Red Hat

Josephine is a consultant specializing in developer productivity and infrastructure. She has worked for enterprises, SMEs, and startups in roles spanning platform engineering, DevOps, Site Reliability Engineering, and technology management.

Monday August 25, 2025 13:30 - 14:10 CEST
G001-002

Cloud & Containers

Audience Experience Level Intermediate

14:25 CEST

Sponsored Session: Freedom to Build: Open Source Foundations for Sovereign Cloud Infrastructure - Orlin Vasilev, SUSE

Monday August 25, 2025 14:25 - 15:05 CEST

G001-002

Cloud-native technologies are reshaping infrastructure strategies, especially as organizations embrace hybrid and multi-cloud models. In this session, we explore how the combination of Multi-Linux environments, Kubernetes, and virtualization forms the backbone of sovereign, cloud-native platforms. As regulatory and supply chain pressures elevate the importance of digital sovereignty, open source solutions—like SUSE-supported projects Rancher, K3s, and Harvester—offer a path and choice to control, agility, and compliance without vendor lock-in. We'll examine how diverse Linux distributions operate within Kubernetes clusters, how virtualization enhances workload isolation and portability, and how cloud-native architectures can be designed to meet sovereignty requirements. Attendees will gain insights into real-world implementations and open standards that are driving the next generation of sovereign cloud infrastructure.

Speakers

Orlin Vasilev

Principal Open Source Technology Advocate, SUSE

Orlin Vasilev is Principal Open Source Technology Advocate and Community Manager for Project Harbor and project K3s as part of the Cloud Native team at SUSE. CNCF Ambassador and driving the biggest Meetup Group in Bulgaria. KCD Sofia organizer, KubeCon CfP review board member and... Read More →

Monday August 25, 2025 14:25 - 15:05 CEST
G001-002

Cloud & Containers

15:35 CEST

Zero-Touch SBOM Generation: Secure Your Build From the Inside Out - Kaushlendra Pratap Singh & Gaurav Mishra, Siemens

Monday August 25, 2025 15:35 - 16:15 CEST

G001-002

In the world of continuous delivery, speed is everything - but security and compliance often lag. Open-source developers and DevOps engineers face a key challenge: how do you ship fast and stay audit-ready?

With SBOMs becoming mandatory under various regulatory Acts, compliance is no longer optional. This talk shows how to proactively integrate open-source tooling into your pipelines—securely, automatically, and at scale.

We’ll discuss how to bring compliance into the early stages of the software development lifecycle—using open-source tools that enable zero-touch, high-quality SBOM generation. Powered by the battle-tested FOSSology toolchain, these solutions integrate seamlessly into your CI/CD pipelines, whether you’re using GitHub Actions or GitLab CI.

It automates:

• Dependency scanning in Python and Node.js projects

• License and copyright detection

• SPDX SBOM generation in JSON, YAML, RDF, or Tag formats

• Seamless CI-native package scanning on every pull request

Lightweight, Docker-based, and already on Docker Hub and GitHub Marketplace, this tool makes compliance and SBOM generation effortless.

Speakers

Kaushlendra Pratap Singh

Research Engineer, Siemens

Kaushlendra Pratap is a Research Professional at Siemens and a passionate advocate for open-source software. With nearly four years of experience in semantic web, license compliance, and machine learning, he has played a key role in contributing to and maintaining tools like FOSSology... Read More →

Gaurav Mishra

Research Engineer, Siemens

Gaurav Mishra, a Research Professional at Siemens, is a passionate advocate for open-source software. Leveraging his seven years of expertise in the domain of semantic web, license compliance and software architectures, he leads the SW360 & FOSSology organizations and drives inno... Read More →

Monday August 25, 2025 15:35 - 16:15 CEST
G001-002

Cloud & Containers

Audience Experience Level Beginner

16:30 CEST

From Chaos To Clarity: Building Observability-First Mindsets in African Engineering Teams - Omolade Akinwumi, Max

Monday August 25, 2025 16:30 - 17:10 CEST

G001-002

In this session, I’ll walk through the journey of introducing observability practices in fast-moving, resource-constrained engineering teams—particularly in Africa, where open-source tooling plays a vital role in production environments. I’ll share the common cultural and technical roadblocks I’ve faced while helping teams shift from reactive firefighting to proactive monitoring and performance tuning.

We'll explore how open-source tools like Prometheus, Grafana, and OpenTelemetry were deployed to bridge observability gaps, how we democratized metrics across dev, infra, and support teams, and what lessons can be applied globally to build resilient systems in under-documented regions. Whether you’re an SRE, DevOps, or developer, this talk will provide insights into how to champion observability where there’s little buy-in and how to scale it organically from the ground up.

Speakers

Omolade Akinwumi

DevOps Engineer, Max

Omolade Akinwumi is a DevOps Engineer passionate about driving observability-first culture within resource-constrained teams. Her work centers around open-source tooling, performance tuning, and empowering teams to move from reactive to proactive operations. As a woman in tech, she’s... Read More →

Monday August 25, 2025 16:30 - 17:10 CEST
G001-002

Cloud & Containers

Audience Experience Level Beginner

11:00 CEST

VM-Friendly Networking on Kubernetes: Customizable Networks, Live Migration, and Best Practices - Surya Seetharaman & Miguel Barroso, Red Hat

Tuesday August 26, 2025 11:00 - 11:40 CEST

G001-002

Bringing virtual machines into Kubernetes introduces unique networking challenges, especially in public cloud environments. Traditional Kubernetes Networking plugins, designed for ephemeral containers, fall short in supporting virtualization-specific needs like stable IPs during live migrations and network segmentation. This talk explores how the CNCF projects OVN-Kubernetes and KubeVirt work together to provide networking that supports the needs of virtual machines on Kubernetes.

OVN-Kubernetes is a robust network plugin for Kubernetes clusters. KubeVirt is a virtualization plugin that manages the lifecycles of VMs on Kubernetes. In this session, we will introduce these projects and walk you through:

- How to set up multiple, customizable networks in Kubernetes

- How to connect your applications and VMs to separate, isolated networks

- How to perform live VM migration across Layer 2 networks without downtime

- Best practices for configuring your networking setup based on your platform—whether you're running in the cloud or on-prem

Join us to learn how to build flexible, VM-friendly networking on Kubernetes.

Speakers

Miguel Duarte Barroso

Principal Software Engineer, Red Hat

Miguel is a Principal Software Engineer for OpenShift Virtualization at Red Hat.

Surya Seetharaman

Principal Software Engineer, Red Hat

Surya is an Open Source advocate and contributor, active in the Kubernetes SIG-Network working group. She is working as a Principal Software Engineer at Red Hat in the OpenShift Networking team. Her areas of interest include Cloud Infrastructure and Networked Services and Systems... Read More →

Tuesday August 26, 2025 11:00 - 11:40 CEST
G001-002

Cloud & Containers

Audience Experience Level Advanced

11:55 CEST

Defense in Depth: High Speed Cloud Native With Soft- and Hardware Protected Functions - Ralph Squillace, Microsoft

Tuesday August 26, 2025 11:55 - 12:35 CEST

G001-002

GitHub is one of the largest (if not the largest) open-source code repositories in the world, but its growth creates technical challenges: How can it continue to scale up activities at its rate of growth? How can it protect activities from each other if one uses code with a malicious attack in it?

This talk describes a fun experiment using the CNCF project Hyperlight and WebAssembly (wasm) components to investigate radical scaling of GitHub events using WebAssembly Components to both handle heavy event load on smaller, less costly VMs but at the same time use Hyperlight to provide hardware protection to each individual function.

WebAssembly is a form of “cloud native binary” that runs on almost any operating system and architecture. The emerging wasm component model is a series of standards that enables any language to make use of components written in any other language while radically scoping in the capabilities of a function, giving it only the permissions to execute that the host deems necessary.

When combined with the Hyperlight project, it becomes possible to use security-in-depth features to scale compute far more with far less risk.

Speakers

Ralph Squillace

Principal Product Manager, Microsoft

Professionally trained in history; don't tell him, because he's professionally suffered in distributed applications for the past 20 years or so. A veteran of OSS wars inside the megacorp, he's thrived as the world changed. He runs Ubuntu at work, except for those times when he does... Read More →

Tuesday August 26, 2025 11:55 - 12:35 CEST
G001-002

Cloud & Containers

Audience Experience Level Any

14:10 CEST

No Internet - No Problem? Air-Gapped Kubernetes on Bare Metal - Christian Bendieck & Carolin Dohmen, BWI GmbH

Tuesday August 26, 2025 14:10 - 14:50 CEST

G001-002

What do you do when connectivity isn’t just flaky – it’s nonexistent? In this talk, we’ll take you through our experience deploying fully automated, air-gapped Kubernetes clusters on bare metal servers – without internet access, without a pre-existing registry, and minimal reliance on datacenter services such as NTP.

As the IT provider for the German Armed Forces, we operate in environments where isolation isn't optional – it's mandatory. Whether due to strict security requirements or the literal ocean between hardware and surface.

At the heart of our setup is a purpose built origin node based on NixOS – which provides all necessary external services to bootstrap the cluster leveraging Talos OS.

This session will cover the technical architecture, the automation stack, and some of the challenges we faced, including:

- Bootstrapping from air-gapped nothingness

- Pitfalls and amazement of Nix and NixOS

- Talos quirks such as image caching limitations

- The joys of automating server setup by accessing BMCs with the Redfish API

- Considerations of NeoNephos projects for further development

You'll leave with practical insights for spinning up fully disconnected Kubernetes clusters.

Speakers

Christian Bendieck

Cloud Engineer, BWI GmbH

I am a Cloud Engineer at BWI with 10+ years of experience in automating IT infrastructures. Currently, I develop private cloud environments and drive automation, including CI/CD pipelines and Kubernetes platform creation. Previously, I worked as a Technical Cloud & Automation Consultant... Read More →

Carolin Dohmen

Cloud Engineer, BWI GmbH

I am a Cloud Engineer at BWI GmbH, working on building a private cloud for the German Armed Forces.

Tuesday August 26, 2025 14:10 - 14:50 CEST
G001-002

Cloud & Containers

Audience Experience Level Beginner

15:05 CEST

Declarative Device Virtualization: Orchestrating GPUs & Hardware in Cloud Native Environments - Samrat Priyadarshi & Anmol Krishan Sachdeva, Google

Tuesday August 26, 2025 15:05 - 15:45 CEST

G001-002

This session explores how declarative pipelines revolutionize GPU and hardware virtualization within Kubernetes. We'll address the challenges of managing specialized hardware resources in cloud-native applications and demonstrate how to orchestrate virtualized devices with ease. Attendees will learn to define device configurations using YAML, deploy virtualized GPUs, FPGAs, and other accelerators into Kubernetes clusters, and automate complex hardware interactions. We'll cover practical examples of using declarative pipelines for AI/ML workloads, edge computing, and high-performance computing (HPC). This talk empowers developers and operators to unlock the full potential of hardware resources, building scalable, resilient, and adaptable device virtualization solutions, specifically focusing on GPU management and optimization.

Speakers

Samrat Priyadarshi

Cloud Engineer, Google

Samrat is a Cloud Engineer at Google with 8 years of experience in Cloud Computing focussing mainly on Kubernetes and related landscapes. He has delivered multiple international and national conferences including Open Source Summit, Japan, 2024. He has a Youtube channel with more... Read More →

Anmol Krishan Sachdeva

Sr. Hybrid Cloud Architect, Google

Anmol is a seasoned International Tech Speaker (delivered 75+ talks), a Distinguished Guest Lecturer, an active conference organizer, and has published several notable papers. He works at Google and focuses on Emerging Technologies.

Tuesday August 26, 2025 15:05 - 15:45 CEST
G001-002

Cloud & Containers

Audience Experience Level Beginner

16:20 CEST

Bridging Worlds: Implementing OpenStack Support for NixOS - Stefan Kober, Cyberus Technology GmbH

Tuesday August 26, 2025 16:20 - 17:00 CEST

G001-002

This talk presents our approach to integrating OpenStack cloud infrastructure with NixOS, addressing a significant gap in development workflows for OpenStack Nova.

Our primary motivation was to simplify testing and development processes by leveraging NixOS' declarative and reproducible environment capabilities. We'll demonstrate how our implementation uses NixOS modules to create deterministic OpenStack deployments where components - particularly the Nova compute and the Neutron network service - are defined as NixOS modules within the Nix expression language. This approach eliminates configuration drift during development cycles and enables developers to quickly reproduce specific environments.

We'll share practical insights from our implementation journey, highlighting how this integration streamlines OpenStack development workflows through consistent test environments and easy service configuration manipulation. We'll discuss the qualitative improvements in developer experience and outline future directions for expanding NixOS support across the OpenStack ecosystem.

Speakers

Stefan Kober

Software Engineer, Cyberus Technology GmbH

Stefan is a software developer from Germany with a background in systems programming and virtualization. He studied computer science at the BTU Cottbus and joined Cyberus Technology after finishing his master thesis.

Tuesday August 26, 2025 16:20 - 17:00 CEST
G001-002

Cloud & Containers

Audience Experience Level Intermediate

11:00 CEST

The Secret Lives of OSS Designers: Understanding Designers Contributing To OSS - Eriol Fox, Superbloom

Wednesday August 27, 2025 11:00 - 11:40 CEST

G001-002

In October 2023 Superbloom.design published findings from 10-16 week diary studies reported by designers actively working on OSS contributions. The diary studies aim was to investigate some of the key questions relating to design in OSS and fill some of the larger systemic “gaps” of information from non-code contributors’ experiences in OSS. There is existing research about designers in open source, but it has focused on analysis of data on issue trackers or interviews with designers.

This session will cover an overview of the study, some of the key learnings and recommendations from Superbloom Designers on how to improve and progress design in OSS.

Speakers

Eriol Fox

Senior Designer and Researcher, Superbloom

Eriol has been working as a designer for 10+ years working in for-profits and then NGO's and open-source software organisations, working on complex problems like sustainable food systems, peace-building and crisis response technology. Eriol now works at Superbloom design, research... Read More →

Wednesday August 27, 2025 11:00 - 11:40 CEST
G001-002

Equity + Inclusion + Accessibility

Audience Experience Level Intermediate

11:55 CEST

The Hidden Heroes: How Non-Technical Contributors Find Their Place in Open Source Communities - Miaolai Zhou & Lahari Chowtoori, AWS

Wednesday August 27, 2025 11:55 - 12:35 CEST

G001-002

In the open source world, while code contributions often take the spotlight, the ecosystem thrives on the crucial work of non-technical contributors. Through interviews with over 10 seasoned open source professionals in documentation, program management, and community building, we explore the vital role of non-technical contributors in open source ecosystems. Our talk delves into their emotional and professional journeys, from navigating code-centric communities to becoming essential project pillars.

We'll share authentic stories about overcoming imposter syndrome, achieving breakthroughs, and maintaining engagement despite challenges. The discussion examines how community dynamics and project structures influence non-technical contributors' experiences and success.

Drawing from these insights, we'll present practical strategies for project maintainers and community leaders to create welcoming spaces, develop inclusive contribution pathways, and foster long-term engagement with non-technical contributors. Whether you're leading an open source project or considering non-technical contributions, you'll gain actionable knowledge for building more inclusive and sustainable communities.

Speakers

Miaolai Zhou

Program Manager, AWS

Mila is a passionate program manager at AWS, spearheading funding programs that provide vital resources to open source projects. Her unwavering commitment to empowering and supporting these communities fosters sustainability, drives innovation, and enables collaboration. She actively... Read More →

Lahari Chowtoori

Technical Program Manager, AWS

Lahari Chowtoori is an AI enthusiast and Technical Program Manager at AWS, focusing on open source, Machine Learning, and Artificial Intelligence. With a background in Data Science and Machine Learning, she is passionate about democratizing AI knowledge and fostering community collaboration.She... Read More →

Wednesday August 27, 2025 11:55 - 12:35 CEST
G001-002

Equity + Inclusion + Accessibility

Audience Experience Level Intermediate

14:10 CEST

Responsible Innovation in AI: How You Can Shape the Future - Emily Witko, Hugging Face

Wednesday August 27, 2025 14:10 - 14:50 CEST

G001-002

AI innovation isn't just technical—it's deeply human. In this talk, Emily Witko, a non-engineer leading AI talent strategy at Hugging Face, explores how diverse roles—from engineers, ethicists and policy experts to communicators and designers—play a crucial role in building ethical, inclusive AI. Through real-world case studies of AI gone wrong, they illustrate the risks of ignoring non-technical perspectives. Attendees will gain tools to challenge assumptions, advocate for accessibility, and bridge the technical-human divide. The future of responsible AI belongs to those who ask hard questions—and that includes you.

Speakers

Emily Witko

Engagement Specialist, Hugging Face

Emily is a people-obsessed engagement specialist with master’s level DEIB training. In their current role at Hugging Face, they source, recruit, hire, develop, and retain top AI talent, with a dedicated focus on decentralized team happiness and growth. Emily thrives in people-centric... Read More →

Wednesday August 27, 2025 14:10 - 14:50 CEST
G001-002

Equity + Inclusion + Accessibility

Audience Experience Level Beginner

15:05 CEST

Understanding the Need for Systemic Change in Open Source Through Intersectionality - Imma Valls, Grafana Labs

Wednesday August 27, 2025 15:05 - 15:45 CEST

G001-002

While open-source communities strive for innovation, achieving genuine diversity and inclusion requires a fundamental understanding of systemic inequalities.

This talk centers on the lived experiences of women navigating open-source spaces. We will reveal the persistent challenges related to safety, lack of representation, and the critical importance of considering intersecting identities. By applying an intersectionality lens, we can gain a clearer understanding of the systemic changes required to dismantle the barriers.

This session will then focus on the power of sponsorship and fostering allyship as key strategies for enacting this change. We will highlight existing initiatives and brainstorm solutions to build a more welcoming and equitable community where everyone feels empowered to contribute.

Join us to explore how understanding the need for systemic change through intersectionality and how actively fostering allyship and sponsorship can pave the way for a truly diverse and inclusive open-source future.

Speakers

Imma Valls

Staff Developer Advocate, Grafana Labs

Imma is a Developer Advocate who loves automating stuff and anything that helps get apps from development to production.

Wednesday August 27, 2025 15:05 - 15:45 CEST
G001-002

Equity + Inclusion + Accessibility

Audience Experience Level Beginner

16:20 CEST

Adding the W3C’s New ARRM To Improve Your Project’s Accessibility - Mike Gifford, CivicActions

Wednesday August 27, 2025 16:20 - 17:00 CEST

G001-002

The W3C recently released a draft of the Accessibility Roles and Responsibilities Mapping (ARRM) framework—a practical tool for open source teams to better define and share accessibility responsibilities across roles. In this session, we’ll explore how ARRM can help open source maintainers, designers, developers, content contributors, and community leaders collaborate more effectively on accessibility goals.

Whether you’re maintaining a solo project or coordinating a large contributor base, ARRM offers a roadmap to embed accessibility into your workflows and culture—without burning out a single “accessibility lead.” Learn how adopting ARRM can help your project move from one-time audits to continuous improvement, and why accessibility is a shared responsibility—not just a technical checklist.

https://www.w3.org/WAI/planning/arrm/

Speakers

Mike Gifford

Open Standards and Practices Lead, CivicActions

Mike Gifford is an open standards and practices lead at CivicActions and a thought leader on digital accessibility in the public sector. He is also a W3C Invited Expert and recognized authoring tool accessibility expert.

Wednesday August 27, 2025 16:20 - 17:00 CEST
G001-002

Equity + Inclusion + Accessibility

Audience Experience Level Any