Last updated: 10 October 2026
FOSS Engineer is written by Jesús Alcocer Tagua and operated by JAlcocerTech – Jesús Alcocer Tagua, a sole proprietorship registered in Poland. For anything about your data: hello [at] jalcocertech [dot] com.
The short version
- No cookies, no ads, no trackers, no selling or sharing your data.
- If you give me your email, it’s used only for what you asked: the quarterly email, or a reply to your question.
- Subscribing needs one click in a confirmation email, and every email has a one-click unsubscribe link.
- You can have it deleted anytime by writing to hello [at] jalcocertech [dot] com.
What is collected, and why
If you subscribe to the quarterly email: your email address, the date and the wording you agreed to. You first get one email asking you to confirm (double opt-in); nothing else is sent until you do, and the time you confirm is recorded too. Used only to send one email per quarter. Legal basis: your consent (GDPR Art. 6(1)(a)), which you can withdraw anytime with the unsubscribe link in any email (it works in one click, also from your email app’s “unsubscribe” button) or by writing to me.
When you unsubscribe I keep a one-way fingerprint (a SHA-256 hash) of your address, never the address itself, so that it is never emailed again — not even if it reappears somewhere by mistake. Legal basis: my legitimate interest in respecting your choice (Art. 6(1)(f)). If you subscribe and confirm again later, the fingerprint is removed.
If you send a question: your email address and your message (and your name, if you add one). Used only to answer you. It does not subscribe you to anything. Legal basis: your request (Art. 6(1)(b)) and my legitimate interest in answering it (Art. 6(1)(f)).
With each submission I also store the page it was sent from, the country your
connection comes from (as reported by Cloudflare) and, if present, campaign
tags in the link (utm_…), so I know which articles people find useful.
If you comment on a post: comments run on a self-hosted
Commento instance at comments.fossengineer.com,
operated by me. Opening a post loads its comments from that server (so your
browser connects to it, like to any page). If you comment, the name, email and
comment you submit are stored there; signing in keeps a login token in your
browser’s storage. Legal basis: my legitimate interest in running a comment
section (Art. 6(1)(f)); ask me anytime to delete your comments or account.
When you just read the site: the hosting provider, Cloudflare, processes standard request data (IP address, browser, requested page) to serve pages and protect the site. Page statistics come from Cloudflare Web Analytics, which uses no cookies and doesn’t track you across sites.
Where it’s stored
| Who | What for | Data |
|---|---|---|
| Cloudflare, Inc. | Hosting, security, form storage (Workers KV), cookieless statistics | Request data; form submissions |
| Mailjet (Sinch Mailjet SAS, France) | Delivering the confirmation email and the quarterly email, from news.jalcocertech.com; open and click tracking are switched off |
Your email address and the email’s content |
| Proton (Switzerland) | The mailbox my replies are sent from (and where your replies arrive) | Your email and our correspondence |
| My own server in Poland | A backup copy of form submissions, and scheduling the emails you subscribed to | Form submissions; which emails were sent |
| My own notification server | A heads-up that a form arrived | Only the email domain (e.g. @example.org), never your address or message |
| My own Commento server | Post comments | Comments, and the name/email you give when commenting |
Cloudflare may process data outside the EU under the EU Standard Contractual Clauses and the EU–US Data Privacy Framework.
How long it’s kept
- Subscription: until you unsubscribe. Then it’s deleted 30 days later (only the fingerprint above stays).
- Unconfirmed sign-ups: deleted after 30 days if you never click the confirmation link.
- Backups: the copy on my own server follows the same rules; deleted records also leave its daily backups within two weeks. Everything is gone within about three months of a deletion.
- Questions: up to 24 months after our last exchange, then deleted automatically.
- Comments: as long as they’re published, or until you ask me to delete them.
Your rights
You can ask for access, correction, deletion or a copy of your data, or object to its use, by emailing hello [at] jalcocertech [dot] com. You can also complain to the Polish data protection authority, the President of the Personal Data Protection Office (UODO), ul. Stawki 2, 00-193 Warszawa, uodo.gov.pl.
Changes
If this page changes, the date at the top changes with it.
Comments