1. Controller
The controller responsible for data processing on this website is Steffen Guldner, Hartwichstrasse 3, 40547 Düsseldorf, Germany, email: kontakt@guldner.com.
2. General information
This website serves as the professional portfolio of a private individual. When visiting the website, personal data may be processed, especially technical access data as well as data you voluntarily submit by email or through external platforms.
3. Hosting and server log files
This website is hosted by STRATO GmbH, Otto-Ostrowski-Straße 7, 10249 Berlin, Germany. When the website is accessed, STRATO processes web server log files. These may include, in particular, IP address, date and time of access, requested file, transferred data volume, browser, operating system, and referrer URL.
Processing is carried out to technically provide the website, ensure server operation, and detect and defend against attacks. The legal basis is Art. 6(1)(f) GDPR. The legitimate interest lies in the secure, stable, and abuse-free operation of this website.
According to STRATO, original server log files with full IP addresses are stored by default for a maximum of 7 days. The IP addresses are then irreversibly anonymized. Statistical evaluations can be accessed via the STRATO customer login for the past 6 weeks. Error log files for faulty access attempts are available for 5 days. Security and fraud prevention data, for example in connection with captchas, can generally be stored for up to 6 months.
4. Contact
If you contact me by email, the information transmitted will be processed in order to handle your request. Depending on the content of the request, the legal basis is Art. 6(1)(b) GDPR or Art. 6(1)(f) GDPR.
5. External links
This website may link to external profiles such as LinkedIn and XING. When you click such links, the privacy policies of the respective provider apply. I have no influence over their data processing.
6. Cookies and tracking
This website does not set cookies and does not use tracking.
7. Storage period
Personal data is stored only for as long as necessary for the respective purpose or as required by statutory retention obligations. The storage periods of the hosting provider STRATO stated above apply to server log files. Data from contact requests is stored for as long as necessary to process the request and any follow-up questions.
8. Rights of data subjects
Under the GDPR, you have rights including access, rectification, erasure, restriction of processing, data portability, and objection. You also have the right to lodge a complaint with a competent data protection supervisory authority.
9. Current version
Last updated: June 2026.