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John Sebastian C.JS

John Sebastian C.

Cybersecurity Consultant | Ethical Hacking | OSINT

€200/day
Santafé de Bogotá, CO
0-2 years

Average response time: 1 hour

Freelancer profile translated to English.
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About John Sebastian

As an Ethical Hacking and OSINT Specialist, I help companies discover their security weaknesses before they are exploited. My approach is 100% practical and proactive.

My main services include:

Vulnerability Analysis and Pentesting: I perform security audits to find critical flaws in your applications and networks.

OSINT Investigations: I analyze your digital footprint to identify exposed information that could pose a risk.

I use a framework of tools developed with open sources to accelerate the reconnaissance phase and offer reports with clear solutions.

If you need an honest and technical assessment of your security, I'm here to help. Contact me and let's talk about your project.
  • Spanish

    Native or bilingual

  • English

    Conversational

  • Italian

    Basic

  • Portuguese

    Basic

  • French

    Basic

Remote only
Primarily works remotely

Experience

  • Proyecto Personal de Portafolio
    Cybersecurity Consultant and OSINT Investigator (Independent/Freelance)
    TECH
    April 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.
    Investigación de Fuentes Abiertas (OSINT) Inteligencia de Amenazas (Threat Intelligence) Desarrollo de Herramientas Hacking ético Explotación de Vulnerabilidades (Exploitation)
  • Tryhackme
    Pentesting in Virtual Labs Experience
    INTERNET 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 TELEINFORMATICOS
    SENA
    2025
    "Especialización en seguridad de redes y sistemas operativos."

Certifications

Skill set

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