System Administrator | Network Engineer | Aspiring Cybersecurity Professional
3rd Year Computer Science Student @ University of Primorska, Slovenia

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║   zstoimchev@githubx:~$ fastfetch                                                  ║
║                                                                                    ║
║       ██ ███████╗███████╗ ██              OS: Fedora Linux (Workstation Edition)   ║
║      ██  ╚══███╔╝██╔════╝  ██             Role: SysAdmin / Network Engineer        ║
║     ██     ███╔╝ ███████╗   ██            Focus: Security & Infrastructure         ║
║     ██    ███╔╝  ╚════██║   ██            Homelab: Proxmox + pfSense               ║
║      ██  ███████╗███████║  ██             Languages: Bash, C, Java, Rust           ║
║       ██ ╚══════╝╚══════╝ ██              Location: Koper, Slovenia                ║
║                                                                                    ║
║     CPU usage: ██████████ 100%            Kernel: Linux 6.17.12-300.fc43.x86_64    ║
║     RAM usage: ████████░░  80%            Uptime: depends on the last reboot       ║
╚════════════════════════════════════════════════════════════════════════════════════╝

I'm a hands-on system administrator and networking enthusiast building expertise in infrastructure security and operations. My work spans from low-level systems programming to production-grade deployments, with a strong focus on understanding how systems work under the hood.

Current Focus:
├── Infrastructure & Virtualization (Proxmox homelab)
├── Network Security & Protocol Analysis  
├── Systems Programming (C, Java, Rust)
└── Security Research & Penetration Testing

• Linux Administration: Debian, Ubuntu, Fedora, RHEL, Arch
• Virtualization: Proxmox VE (multi-VM homelab), VMware, VirtualBox
• Self-Hosted Services: Nextcloud, Apache web servers, database servers
• Windows: Windows Server, Active Directory basics

• Core Protocols: TCP/IP stack, routing, switching
• Security Tools: Wireshark, Nmap, tcpdump, Burp Suite (learning)
• Network Services: pfSense, OpenVPN, DNS, DHCP
• Security Concepts: IDS/IPS, firewall configuration, OWASP Top 10

• Systems Programming: C, C++, Java, C#, Python
• Backend Development: .NET Core/Aspire, Spring Boot, Node.js/Express
• Frontend: React, Next.js, TypeScript
• Containerization: Docker (exploring Kubernetes)
• Version Control: Git, GitHub workflows

Peer-to-peer network implementing onion routing in pure Java 21. Demonstrates understanding of network protocols, encryption layers, and anonymous communication systems.

• Skills: Network programming, cryptography, P2P architecture

Custom blockchain developed in Java 21 from scratch, exploring distributed systems and cryptographic data structures.

• Skills: Distributed systems, hashing algorithms, consensus mechanisms

Implementation of LZW compression algorithm in Java, demonstrating data structure optimization and algorithmic efficiency.

• Skills: Algorithm implementation, performance optimization

Client-server message exchange application using raw C sockets. Hands-on experience with TCP/IP programming at the systems level.

• Skills: Socket programming, C, network protocols

Full-stack application using .NET Core backend with React frontend for managing books and authors.

• Skills: RESTful APIs, database design, modern web architecture

Personal portfolio with integrated blog built with Next.js, deployed and self-hosted.

• Skills: Next.js, TypeScript, deployment, web hosting

Current Setup:

• Hypervisor: Proxmox VE cluster managing multiple VMs
• Services Running:
  • Apache web servers
  • Nextcloud (self-hosted cloud storage)
  • Database servers (PostgreSQL, MySQL)
  • Development environments
• Network: Segmented VLANs, pfSense firewall, VPN access
• Security: Regular patching, firewall rules, intrusion monitoring

Learning Goals:

• Infrastructure as Code with Ansible
• Docker Swarm/Kubernetes orchestration
• Centralized logging (ELK stack)
• Security hardening and compliance

• Web Security: Practicing OWASP Top 10 vulnerabilities in controlled environments
• Penetration Testing: Working through VulnHub machines, TryHackMe labs
• Tools: Gaining proficiency with Burp Suite, Metasploit, Nessus
• Network Security: IDS/IPS configuration, network traffic analysis
• System Hardening: CIS benchmarks, secure configurations

• CompTIA Security+
• Certified Ethical Hacker (CEH)
• CCNA

Fun fact: You can't get hacked if you pull the cable in time... right? 🤓🔌💥"z

Operating Systems: Linux (Primary), Windows Server
Languages: Java, C, C++, C#, JavaScript/TypeScript, Python, Bash
Frameworks: .NET Core, Spring Boot, React, Next.js, Node.js
DevOps: Git, Docker, Proxmox, CI/CD basics
Databases: PostgreSQL, MySQL, SQLite
Networking: TCP/IP, DNS, DHCP, VPN, Firewall configuration
Security Tools: Wireshark, Nmap, Burp Suite, tcpdump, pfSense

• Building automated deployment pipelines with Ansible
• Expanding Proxmox homelab with security-focused segmentation
• Contributing to open-source projects in networking and security
• Documenting infrastructure and creating technical write-ups
• Preparing for security certifications

• 🌐 Website: zstoimchev.com
• 📧 Email: zstoimchev@outlook.com
• 💼 LinkedIn: in/zstoimchev
• 📍 Location: Koper, Slovenia

"Passion and dedication, Linux for the Nation!"

💡 Open to collaborations on infrastructure, networking, and security projects