The InnerSource Gathering Berlin 2025 successfully convened on 3 May 2025, welcoming more than 20 practitioners, advocates, and newcomers to an energising day of learning and collaboration.
Programme Overview
| Time | Session | Speaker(s) | Organisation |
|---|---|---|---|
| 09:00 | Doors open | — | — |
| 09:30 | Opening Keynote – Welcome to the InnerSource Gathering | Isabel Drost-Fromm and Peter Roßbach | Former Chair, InnerSource Commons Foundation/ Founder bee42, System architect, DevOps engineer, Apache member, Apache Tomcat committer, Infracoder and Docker Influencer |
| 10:00 | The InnerSource ↔ Open Source Virtuous Cycle | Tom Sadler | BBC (Director & Treasurer, InnerSource Commons) |
| 10:35 | Contributor Journey Optimization | Guilherme Dellagustin | SAP |
| 11:10 | InnerSource@DB – Open-Source Practices at Deutsche Bahn | Carsten Hoffmann | DB Systel GmbH |
| 11:45 | Creation & Application of InnerSource Maturity Models | Daniel Izquierdo Cortázar, PhD | Bitergia / President, InnerSource Commons |
| 12:30 | Lunch break | — | — |
| 14:00 | Interactive Afternoon – BarCamp | Facilitated by event team | — |
| 18:00 | Official programme ends | — | — |
Key Highlights
Cross-industry alignment
Broadcast media, rail transport, and enterprise software organisations presented parallel challenges and complementary solutions—underlining the versatility of InnerSource across domains.Data-driven storytelling
Speakers emphasised the role of contribution analytics and maturity models in sustaining executive sponsorship and guiding incremental adoption.Community energy
The afternoon BarCamp generated eight spontaneous sessions on topics ranging from lightweight governance models to AI-assisted code review workflows, reinforcing the event’s participatory spirit.
Speaker Snapshots
- Tom Sadler (BBC) illustrated how open-source success inside the broadcaster seeded a virtuous cycle that now trains “the next generation of open sourcerers.”
- Guilherme Dellagustin (SAP) proposed “Contributor Journey Optimization,” a repeatable backlog-driven method to lower friction for first-time contributors—call for pilot projects issued!
- Carsten Hoffmann (DB Systel) showcased a central InnerSource platform that distinguishes community-maintained from team-maintained projects, bridging toward public open source.
- Daniel Izquierdo Cortázar (Bitergia) shared lessons from applying an InnerSource maturity model across multiple enterprises, outlining the “missing skills” that models alone cannot reveal.
Community & Next Steps
The gathering reaffirmed the strength of the #local-german channel on the InnerSource Commons Slack as the hub for year-round collaboration.
👉 Join the conversation: https://bit.ly/40HEaG5
Special thanks to Isabel Drost-Fromm for curating the agenda, and to Paul Berschick and Alexander Brateanu of Plain Schwarz for impeccable on-site production.
Vielen Dank to everyone who helped make Berlin 2025 a success. Together we continue to connect, create, and contribute—building a stronger, more open software culture across the DACH region and beyond.