Antonio is a seasoned IT security and network infrastructure expert with extensive experience in Linux and Windows Server administration. He has designed, deployed, and hardened networks for commercial and government organizations, including enhancing web-application firewall protections for Brazilian military systems to reduce exposure to zero-day and brute-force attacks. A former Army Lieutenant Colonel, he led complex operations and made decisive, risk-calibrated decisions under pressure. As a Cyber Security professor at the Military Academy for seven years, he developed and delivered curriculum on threat modeling, penetration testing, secure system design, and incident response. His core competencies include: Security policy development & compliance, Network design, hardening & administration, Penetration testing & vulnerability assessment, Scripting & automation (Bash, PowerShell, Python), and Operational support & incident response. Antonio is committed to lifelong learning and staying ahead of emerging cybersecurity threats.