Privacy, by design.

Who is responsible

This website, mathcoder.com, is operated by Dimitris Tsoukalos (MathCoder), based in Greece, who acts as the data controller for any personal data described below. For any privacy question or request, email tsoukalos@mathcoder.com.

Analytics without cookies

The site uses PostHog, hosted on PostHog’s EU Cloud infrastructure in the European Union, to understand how the site is used: page views, project views, use of the project filters, contact-form interactions and clicks on external links. Analytics runs entirely without cookies or local storage — nothing is stored on your device, which is why the site shows no cookie banner. Any analytics state is kept only in your browser’s memory and disappears when you close the tab; each visit is therefore counted as a new, anonymous visitor.

Your IP address is processed transiently by PostHog to derive an approximate location (country and city) and to help filter out automated traffic. Visitors are never identified, no profile is built, no data is shared with advertisers and no cross-site tracking takes place. Session recording is disabled. The legal basis for this processing is legitimate interest (Article 6(1)(f) GDPR): measuring, in a minimally invasive way, how a small portfolio site is used.

Contact form

If you use the contact form, the name, email address and message you submit are sent by email to tsoukalos@mathcoder.com, and a confirmation copy is emailed to the address you provided. This data is used only to respond to your enquiry and is not stored in any database on the site. The legal basis is taking steps at your request prior to entering into a contract (Article 6(1)(b) GDPR) or, for general enquiries, legitimate interest. Correspondence is kept only as long as needed to handle the conversation.

Hosting

The site is hosted on servers in the European Union. Like most web servers, the hosting provider may keep standard technical access logs (including IP addresses) for security and troubleshooting, which are rotated automatically.

Your rights

Under the GDPR you have the right to access, rectify or erase your personal data, to restrict or object to its processing, and to data portability. Since analytics data is anonymous and cannot be linked back to you, these rights mainly concern contact-form correspondence. To exercise them, email tsoukalos@mathcoder.com. You also have the right to lodge a complaint with the Hellenic Data Protection Authority (dpa.gr) or your local supervisory authority.

External links

Links to external sites such as LinkedIn, YouTube or project websites lead to services with their own privacy policies, which apply once you leave mathcoder.com.

Changes

Any change to how this site handles data will be reflected on this page. Last updated: 15 July 2026.