Privacy policy

1. Controller

The controller responsible for processing personal data on this website is:

Email: marcus@sier-ing.de

2. Technical provision of the website

When you visit a website, the web server may process information required for technical purposes. This may include, in particular:

• IP address of the requesting device
• Date and time of access
• File or page requested
• Volume of data transferred
• HTTP status code
• Browser and operating system
• Where applicable, the previously visited page

Where technically necessary, processing serves to provide the website securely and reliably, analyse errors and protect technical systems.

Where processing is based on a legitimate interest, the legal basis is Article 6(1)(f) GDPR.

The legitimate interest consists, in particular, in the secure and reliable operation of the website and the server systems used.

3. Contact by email

If you contact me by email, the information you provide will be processed insofar as necessary to handle and respond to your enquiry.

If your enquiry concerns entering into a contract or collaboration, processing may be based on Article 6(1)(b) GDPR.

In other cases, processing may be based on Article 6(1)(f) GDPR. The legitimate interest is then the handling of and response to your enquiry.

Email communication also involves processing data through the email systems and email providers involved.

4. Contact form

If you use the contact form on this website, the data you enter will be processed to handle and respond to your enquiry.

This includes, in particular, your name, email address, subject and message content.

If your enquiry concerns entering into a contract or collaboration, processing may be based on Article 6(1)(b) GDPR.

In other cases, processing is based on Article 6(1)(f) GDPR. The legitimate interest is the handling of and response to your enquiry.

Data submitted through the contact form is processed through the server and email systems set up for this website.

5. Cookies and tracking

As currently implemented, this website does not use analytics or marketing cookies.

No external tracking or analytics services are currently used.

6. External content and fonts

As currently implemented, the files required for the design of the website are provided locally.

No external tracking services or externally loaded analytics tools are currently integrated.

7. Retention period

Personal data is stored only for as long as necessary for its respective purpose or as required by statutory retention obligations.

Technical log data is deleted once it is no longer required for operation, security or error analysis, unless security-related incidents require longer retention.

8. Recipients and data transfers

Personal data is shared only where technically necessary, legally required or necessary to handle a communication initiated by you.

As currently implemented, this website does not specifically transfer personal data to recipients in third countries.

9. Your rights

Where the legal requirements are met, you have, in particular, the right to:

• Access your personal data
• Rectification of inaccurate data
• Erasure of personal data
• Restriction of processing
• Data portability
• Object to certain processing activities

You also have the right to lodge a complaint with a competent data protection supervisory authority.

10. Competent data protection supervisory authority

State Commissioner for Data Protection and Freedom of Information North Rhine-Westphalia (LDI NRW)

11. Updates to this privacy policy

This privacy policy will be updated whenever the technical or legal arrangements of this website change.

Last updated: 25 October 2026