01
SKPhoto follows
Stefan Keller
Managing Director
- IT consultant and expert with experience since 2001
- Cybersecurity specialist
- Senior Software Developer
- AI consultant and specialist
REQUEST CONFIRMED
Let's connect
Contact
Book a no-obligation first conversation with HDN – for cybersecurity, AI automation, IT infrastructure or custom software development.
Report a vulnerability↘Vulnerability report or support request?
To report a potential vulnerability affecting an HDN website or one of our products, use Report a vulnerability. This page also provides the direct PaulinAI reporting channel.
For an incident at your company, use your agreed support or emergency contact or the HDN ticket system. Please do not submit passwords or confidential customer data through the general contact form.
Book your first conversation now.
People at HDN
Four people. One shared standard.
Personal responsibility, short paths and collaboration that makes technology understandable and reliably usable.
02
SKPhoto follows
Stefanie Keller
Accounting
- Accounting and commercial organisation
03
MKPhoto follows
Marlene Keller
Team Support
- Support with organisational and operational activities
04
CSPhoto follows
Christoph Schatz
Software Developer
- Software development
Show Google Maps
The interactive map is loaded from Google only with your consent.