IT Systems & Security Manager Resume
Resume:
RAY CONTRERAS
I T MANAGER
KEY SKILLS
• Windows Server,
Windows 10/11
• AD/Azure/Entra ID
• DNS, DHCP, VLANs,
VPNs, firewalls, switches
• VMware, Hyper-V, Citrix
• EDR/XDR, MFA, endpoint
security
• Backup/disaster recovery
• Intune, RMM platforms
• ConnectWise, Zendesk
•
EDUCATION
BACHELOR’S OF ARTS
Computer Systems
Management
St. Edward’s University
Austin, TX, GPA 3.75
CERTIFICATE
Genetec Synergis /
Omnicast SC-STC-001 –
5.13 Certification # 339092
CERTIFICATE
Software House C-CURE
System Installer 9000
Certification # ZNVW2306
CERTIFICATE
OSHA 10 General Industry
PROFESSIONAL EXPERIENCE
IT FIELD SUPPORT SPECIALIST (LEAD) NOV 2025 –FEB - 2026 Tarrytown Exposure Pharmacy (Contract)
Serve as the Level 2/3 escalation point for hardware, software, printer and device- related issues across multiple sites.
• Support and configure desktops, laptops, docking stations, scanners, and peripherals, ensuring minimal down time.
• Manage MDM (Intune) solution to deploy, secure, and maintain mobile and field devices throughout their lifecycle.
• Diagnose and resolve complex network issues, including network latency, VLAN configuration, VPN setup and performance bottlenecks.
• Support onboarding and offboarding, including workstation setup, AD/Entra/MS365/Exchange account provisioning, and profile configuration.
• Coordinate with vendors for maintenance, escalations, and SLA adherence.
• Conduct regular on-site visits to proactively assess, maintain, and optimize IT hardware and software environments.
IT SECURITY SYSTEM SUPPORT III FEB 2025 – JUN 2025 Preferred Technologies, LLC (Full-Time)
Led on-site installation and service of access control, CCTV, and alarm systems for corporate and public-sector facilities.
• Served as Tier 3 escalation point for Windows Server–based security, access control, and video surveillance environments.
• Designed, implemented, and optimized complex security system configurations (Genetec, Software House), ensuring system integrity, uptime, and compliance.
• Performed system audits and risk assessments; identified configuration gaps and implemented corrective actions.
• Managed IP addressing, network integration, and server dependencies for security infrastructure.
• Mentored junior technicians and provided technical leadership; acted as lead in absence of IT Manager.
• Emphasized documentation, standards, and repeatable solutions to reduce recurring issues.
• Ensured compliance with IT (NIST, HIPAA) and safety policies during field operations.
PROFESSIONAL PROFILE
Proactive and detailed oriented IT professional with 5+ years of experience supporting and stabilizing complex client environments across MSP, enterprise, and multi-site infrastructures. Proven final-escalation resource for Windows Server, Microsoft 365, Azure/Entra ID, virtualization, networking, and security systems. Known for structured troubleshooting, sound technical judgment, and ownership of issues through resolution. Strong communicator who values documentation, standards, and long-term system reliability.
***.*********@*****.***
www.linkedin.com/in/ray-
contreras-a47a3226b
Austin, TX
rcontreras cont’d
SENIOR SYSTEM ADMINISTRATOR SEP 2024 – FEB 2025
McCoy Corporation (Contract)
• Administered multi-site Windows Server, Active Directory, DNS/DHCP, and Group Policy environments.
• Managed Microsoft 365 tenant including Exchange Online, security groups, and access controls.
• Coordinated endpoint patching, system updates, and EDR/AV compliance.
• Assisted with hybrid Azure integrations and cloud workload migrations.
• Produced clear technical documentation and trained users on tools and best practices. SYSTEMS ENGINEER III AUG 2023 – SEP 2024
Buchanan & Edwards (Full-Time)
• Supported a 500-user environment, resolving advanced desktop, server, and virtualization issues.
• Deployed and maintained VMs using VMware and Hyper-V.
• Managed Active Directory lifecycle tasks and Group Policy changes.
• Participated in security audits by delivering access logs, patch status, and compliance data.
• Developed PowerShell scripts to automate administrative tasks and reduce operational overhead.
• Delivered technical training to non-technical staff. LEAD TECHNICAL CONSULTANT FEB 2023 – AUG 2023
Ergos Technology (Contract)
• Provided end-to-end Tier 2–3 support across multiple client environments.
• Supported and implemented solutions involving Microsoft 365, Azure AD, VMware, Hyper-V, Citrix, Cisco Meraki, SonicWall, Okta, Duo, MFA, and ConnectWise.
• Designed durable solutions rather than one-off fixes; documented standards for repeatability.
• Deployed hosted email security and strengthened client security posture. INFRASTRUCTURE ENGINEER NOV 2022 – FEB 2023
Boxx Technologies (Contract)
• Delivered advanced support for GPU virtualization and passthrough environments.
• Supported Cisco (Meraki), pfSense networking, and cloud integrations (Azure, Google Cloud).
• Created structured test plans and technical reports to guide decision-making. SENIOR SYSTEM ADMINISTRATOR AUG 2022 – NOV 2022
Arnold Oil Company (Contract)
• Led design, deployment, and administration of Windows Server 2016/2019 infrastructure for 700+ users across 6 sites.
• Supported a high-availability, multi-location environment with disciplined change control. SENIOR ASSOCIATE, IT DEC 2021 – AUG 2022
GQR Global Markets (Contract)
• Provided global IT support for 250+ users.
• Managed Azure, SSO, Microsoft 365, hardware/software procurement, SLA coordination, and all IT inventory.
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