About John Sebastian
Spanish
Native or bilingual
English
Conversational
Italian
Basic
Portuguese
Basic
French
Basic
Experience
- Proyecto Personal de PortafolioCybersecurity Consultant and OSINT Investigator (Independent/Freelance)TECHApril 2025 - Today (1 year and 4 months)Cundinamarca, DC, Colombia
- Development and maintenance of an intelligence framework (OSINT) that centralizes over 150 tools for security audits.
- Creation of a proprietary cataloging system that accelerates the reconnaissance phase in penetration tests by more than 50%.
- Continuous research and analysis of over 600 open-source tools for integrating the most efficient solutions in cyber intelligence and threat analysis.
- Execution of simulated security audits using the framework to validate its effectiveness in practical ethical hacking scenarios.
- TryhackmePentesting in Virtual Labs ExperienceINTERNET OF THINGS (IOT)August 2025 - Today (1 year)Cundinamarca, DC, Colombia
- Successful compromise of over 15 machines in lab environments (TryHackMe), achieving privilege escalation (root/SYSTEM) in 80% of cases.
- Identification and exploitation of high-risk vulnerabilities, including SQL Injection (SQLi), Remote Code Execution (RCE), and service misconfigurations.
- Practical application of penetration testing methodologies and web security principles (OWASP Top 10).
- Use of Bash scripting to automate enumeration and reconnaissance tasks in pentesting scenarios.
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Education
- TÉCNICO EN SISTEMAS TELEINFORMATICOSSENA2025"Especialización en seguridad de redes y sistemas operativos."
Certifications
- Digital Forensics for Pentesters - EC-Council, 2025EC-COUNCIL2025
- Digital Forensics for Pentesters - Hands-on LearningEC-COUNCIL2025