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I use Arch btw
๐Ÿ’ญ
I use Arch btw

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0x1eo/README.md

Hey, I'm Leandro Afonso (0x1eo)

Cybersecurity Student โ€ข Defensive Security & Systems Engineering

I'm a defensive-security-focused student with hands-on experience building resilient Linux systems, deploying network security tools like firewalls and IPS, and engineering high-availability services. My passion is in building and hardening digital infrastructure, from my own self-hosted services to full-stack web applications. I'm always looking for opportunities to improve monitoring, automate operations, and make systems more robust.


๐Ÿ›ก๏ธ Core Focus & Expertise

My work and studies revolve around three main pillars:

  • Hardening Digital Fortresses (Defensive Security): Designing and deploying layered security controls. I use my home lab as a personal proving ground for tools like pfSense, Suricata, and Snort to monitor, detect, and respond to threats in real-time.

  • Building Resilient Systems (Systems Engineering): Architecting and maintaining high-availability infrastructure. I have practical experience building redundant clusters with NGINX, MariaDB Cluster, and GlusterFS, and I'm comfortable containerizing applications with Docker.

  • Developing Secure by Design (Software Engineering): Writing clean, secure, and efficient code. I enjoy working across the full stack, from low-level systems programming in C and Go to building RESTful APIs in Node.js and frontends in Vue or Angular.


๐Ÿš€ Project Highlights

Here are a few projects I'm particularly proud of.

Project Description Key Technologies
Home Network & Security Lab My personal, self-hosted lab for experimenting with network services and security tools on Raspberry Pis. Pi-hole, ntopng, Netdata, WireGuard, OpenVPN, Linux Admin
High-Availability Web Cluster Built a redundant e-commerce cluster with load balancing and automatic failover on Debian VMs. NGINX, MariaDB Cluster, GlusterFS, Bash
Penetration Testing Lab Conducted reconnaissance, exploited vulnerabilities (Log4j, EternalBlue), and exfiltrated data. Nmap, Metasploit, pfSense, Suricata, Wireshark
Diet Platform (Full-Stack) A full-stack platform connecting nutritionists and patients with JWT auth and real-time chat. Node.js, Express, Angular, MongoDB, Socket.IO, REST APIs
Playlix Official Website Designed and developed a responsive, fast-loading company website as a freelance project. Vue.js, JavaScript, HTML/CSS

๐Ÿ› ๏ธ My Digital Toolkit

Languages:

Backend, Databases & Web:

Infrastructure & Security Tools:


๐Ÿ“Š My GitHub Journey

Top Languages


๐ŸŽง Vibes on Repeat

spotify-github-profile

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  1. cwiz cwiz Public

    Lightweight C library for controlling WiZ smart lights

    C

  2. 0x1eo.dev 0x1eo.dev Public

    Vue 1

  3. HAWC HAWC Public

    High-Availability Web Cluster

    Shell