Sys admin SR, IT Help Desk

SILVIO ALDO MARTINEZ

Systems Administrator

Comodoro Rivadavia, Chubut, Argentina ***************@*******.*** +54 9-297-***-**** linkedin.com/in/silvio-martinez-695496b2

PROFESSIONAL SUMMARY

Systems Administrator with 5+ years of experience in enterprise IT infrastructure, actively transitioning into Cybersecurity and SOC Operations. Proven hands-on experience in incident analysis, threat detection (phishing, brute force, anomalous authentication activity), log analysis, and SIEM tooling. Skilled in Python, SQL, and scripting for security process automation. Detail-oriented and proactive professional with a strong foundation in ITIL incident management, access control, and infrastructure hardening — eager to contribute to a Security Operations team. CORE COMPETENCIES

Incident Analysis & Response Threat Detection & Hunting SIEM / EDR Log Analysis IOC Identification Phishing Investigation Active Directory / GPO Python / SQL / Scripting ITIL Best Practices SECURITY PROJECTS

Phishing Incident Analysis 2024 – 2025

• Analyzed malicious email scenarios to identify Indicators of Compromise (IOCs): spoofed domains, malicious URLs, and social engineering techniques.

• Assessed potential business impact related to credential theft and proposed documented mitigation strategies following SOC best practices.

• Tools & techniques: email header analysis, VirusTotal, URL inspection, DNS/WHOIS record review. Log Analysis & Brute Force Detection 2024 – 2025

• Analyzed authentication logs to detect brute force attack patterns: repeated failed login attempts followed by successful unauthorized access.

• Evaluated risk of system compromise and recommended mitigation measures including account lockout policies, IP blocking, and SIEM alerting rules.

SIEM Alert Analysis & Incident Investigation 2024 – 2025

• Analyzed simulated SIEM alerts by correlating events: failed login attempts, geolocation anomalies, and suspicious system access patterns.

• Assessed incident severity and potential business impact; recommended MFA implementation and password reset procedures as containment measures.

PROFESSIONAL EXPERIENCE

Systems Administrator

Transportes Crexell S.A. — Comodoro Rivadavia, Argentina Mar 2020 – Oct 2025

• Managed critical enterprise infrastructure including SAP Business One and SAP HANA, ensuring system availability and business continuity.

• Administered user access controls, permissions, and security policies aligned with the principle of least privilege.

• Monitored system availability and responded to security and technical incidents, performing root cause analysis under ITIL methodology.

• Automated operational processes and report generation using Python and SQL, reducing incident response times.

• Managed backup strategies and data integrity assurance; maintained technical documentation of procedures and infrastructure.

IT Technician Level 2

YPF – Regué Bucic y Asociados — Comodoro Rivadavia, Argentina Aug 2019 – Jan 2020

• Provided Level 2 technical support across corporate infrastructure: Windows Server (AD, DNS, DHCP, GPO) and Linux servers (Ubuntu, CentOS).

• Managed incidents through HPSM (HP Service Manager) applying ITIL best practices with focus on response times and operational continuity.

• Supported executive video conferencing (Polycom) and resolved critical incidents with direct business operations impact.

EDUCATION & CERTIFICATIONS

Systems Analyst (Analista de Sistemas) 2019

Universidad Nacional de la Patagonia San Juan Bosco Certifications

• CompTIA Security+ — (in progres)

• Foundamentals of cybersecurity — (Coursera)

TECHNICAL SKILLS

SOC / Security: Incident analysis, Log analysis, Threat detection, SIEM, EDR, IOC identification, Threat Intelligence, Incident response

Systems: Windows Server (Active Directory, DNS, DHCP, GPO), Linux (Ubuntu, CentOS) ERP /

Databases:

SAP Business One, SAP HANA, SQL Server, database administration and maintenance Programming: Python, SQL, VBScript — process automation and reporting Networking: VPN, Firewalls, remote connectivity, user and permission management, Office 365 / Exchange LANGUAGES

Spanish: Native English: Professional working proficiency (advanced technical reading) References available upon request Project portfolio available on LinkedIn

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