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Infosec notes, systems experiments, hardware logs, and project writeups.
Latest Notes
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Coding Agent Skills
Reusable skills for Codex, Claude Code, and OpenCode.
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ESP32 Lab Notes — My First Experiments
Over the last weeks I started experimenting with ESP32 boards, embedded development, UART communication, and low-level hardware concepts.
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Prometeo: Building Banking APIs at Scale
I joined the podcast Cuando el río suena from Acueducto to talk about Prometeo, the experience of building API infrastructure at scale, and why usability always wins over technical purity.
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K3s Cluster on Three Mac mini Late 2014 Nodes
This document describes my current K3s homelab setup running on three Mac mini Late 2014 machines with Ubuntu.
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Linux - Space System Optimization
To identify and optimize space usage on your disk in a Linux system, you can use a combination of bash commands. Here are some steps you can follow:
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My First IDOR: One Number, Two Apps
I did not find my first IDOR by throwing a scanner at a target. I found it by watching a mobile app talk.
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Burp on Android
Follow steps 1, 2 from portswigger official guidelines. Then do the following in step 3.
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HTB - Red Panda
Red Panda is a Spring Boot box where the first real foothold comes from recognizing a template injection path and choosing the right Java expression syntax. The exploit chain is a good reminder that payload syntax matters as much as the vulnerability class.