Miracles on demand, impossible in three days!
Kris builds things that have no business functioning, then writes several thousand words explaining why they do.
Software, writing, and the occasional course or consultation. Writes in Czech and English, fixes both after the deadline.
Building your own mail server is, technically, an afternoon's work. Proving to the rest of the world that a spammer isn't sitting behind it takes considerably longer. And when you finally verify the whole thing works, your own ISP blocks you.
A postmortem of one WordPress site: an upload plugin let PHP in, and out of it grew a webshell, a dropper and a db.php loader. The first cleanup wasn't enough — persistence lived in WP cron and brought it all back every ten minutes. What to look for when malware returns after deletion.
Five editions of Hackers Congress Paralelní Polis (2019–2024) from the guy who held the cables: pretix and BTCPay that wouldn't cooperate, volunteers who don't read the group, microphones that die at the right moment. And a building that ended before the ticketing system did.