Windows Server • Active Directory • Group Policy • Microsoft Entra • Microsoft 365 • ADFS • WDS
PROFESSIONAL PROFILE
Chris LeSage
Senior Systems Administrator
Windows & Network Infrastructure • CCNA
Senior Systems Administrator with 10+ years of progressive IT experience specializing in enterprise infrastructure, Windows Server, Active Directory, Microsoft 365, Microsoft Entra, VMware, networking, virtualization, and security. Experienced managing large-scale server and data center environments with a strong focus on availability, security, and reliability.
TECHNICAL EXPERTISE
VMware ESXi • Virtualization • SAN • Backup & Recovery • Data Center Operations • Linux
Cisco • CCNA • DNS • DHCP • NPS • 802.1X • Firewalls • Network Administration
Enterprise Security • Email Security • System Hardening • Proofpoint • CrowdStrike • SIEM
PROFESSIONAL EXPERIENCE
Senior Server Administrator
St. Johns County Board of County Commissioners
Administered enterprise server and data center infrastructure supporting hundreds of virtual machines across multiple data centers. Managed Active Directory, Group Policy, DNS, DHCP, WDS, ADFS, NPS, 802.1X, Microsoft 365, Microsoft Entra, VMware ESXi, SAN, Veeam backup infrastructure, and critical server resources.
Server Administrator
St. Johns County Board of County Commissioners
Supported enterprise server, identity, networking, virtualization, backup, security, and infrastructure operations.
Senior Onsite Engineer
IVenture Solutions
Provided senior-level systems, server, network, and infrastructure support, including technical escalations, installations, upgrades, maintenance, and troubleshooting.
Field Support Technician
IVenture Solutions
Provided technical support and infrastructure services, progressing into senior engineering responsibilities.
Technology Support Specialist
St. Johns County School District
CURRENT INFRASTRUCTURE PROJECT
Azure Linux Web Infrastructure
This site is itself a working infrastructure project, deployed on Microsoft Azure using Ubuntu Linux and Nginx, secured with HTTPS, and extended with a Python/Flask monitoring service that reports live server metrics.
VIEW LIVE INFRASTRUCTURE DASHBOARD →CERTIFICATIONS
Cisco Certified Network Associate (CCNA)
Proofpoint Certified Security Awareness Specialist
ISC2 Credentials
EDUCATION
St. Johns River State College
Associate of Science — Computer Engineering