Privacy Policy

Last updated: 2 August 2026

This Privacy Policy explains how Castor d.o.o. (“Castor”, “we”, “us”) collects, uses, and protects personal data when you visit zeljko.dev or contact us about blockchain architecture and development services.

1. Who we are

Castor d.o.o.
Registered office: Dugi Vrh 25, Varazdin Breg, 42204 Turcin, Croatia
Office: Šibenska 1, 42000 Varaždin, Croatia
Website contact: contact@zeljko.dev
Company e-mail: info@castorweb.eu
OIB: 65422973876

2. Data we collect

We may collect the following categories of personal data:

• Contact data - name, e-mail address, and message content when you contact us by e-mail or other channels linked from this site.
• Technical data - IP address, browser type, device information, and pages visited, collected through server logs and cookies where applicable.
• Communication data - records of correspondence when you engage us for blockchain, DeFi, Solana, or software engineering services.

We do not intentionally collect private keys, wallet seed phrases, or on-chain credentials. Never share such information with us.

3. How we use your data

We use personal data to:

• Respond to enquiries and project requests
• Provide and manage our professional services
• Operate, secure, and improve this website
• Measure site usage with analytics, if you consent
• Comply with legal and regulatory obligations

4. Legal basis (GDPR)

Where EU GDPR applies, we process data on the basis of:

• Contract or pre-contractual steps at your request
• Legitimate interests in operating our business and website
• Legal obligations
• Consent, where required (e.g. non-essential cookies / analytics)

5. Cookies

This website uses:

• Essential cookies / local storage - theme preference and cookie-consent choices. These are needed for basic site function.
• Analytics cookies - Google Analytics (measurement ID G-W8MKV0WDX0) only after you accept analytics in Cookie settings. You can change or withdraw consent at any time via Cookie settings in the footer.

6. Data sharing

We do not sell personal data. We may share data with trusted service providers (e.g. hosting, e-mail, Google Analytics if enabled) who process data on our instructions and under appropriate agreements, or when required by law.

7. International transfers

If data is transferred outside the EU/EEA (for example via analytics or hosting providers), we ensure appropriate safeguards are in place as required by applicable law.

8. Retention

We retain personal data only as long as necessary for the purposes described above, including legal, accounting, or reporting requirements.

9. Your rights

Under GDPR, you may have the right to access, rectify, erase, restrict processing, object, and data portability. You may also lodge a complaint with the Croatian Personal Data Protection Agency (AZOP).

10. Security

We apply appropriate technical and organisational measures to protect personal data. No method of transmission over the internet is completely secure.

11. Changes

We may update this Privacy Policy from time to time. The “Last updated” date at the top will reflect the latest version.

12. Contact

For privacy-related questions: contact@zeljko.dev or info@castorweb.eu