Jeremiah Cernusak
About Me
I am a System Administrator with a strong foundation in automation and enterprise virtualization within cleared environments. While my professional background is heavily rooted in Windows administration, my true passion and focus are dedicated to Linux ecosystems.
To put it simply, I am borderline obsessed with computers. When I'm not working, I'm constantly configuring my home lab, exploring containerization, and frequently optimizing my personal Linux machines. I am currently formalizing my command-line expertise and actively working toward my RHCSA 
certification as I attempt to pivot fully into a DevOps role.
Certifications
CompTIA Security+
VMWare VCTA-DCV
Azure Fundamentals
Technical Stack
Operating Systems
Linux, Windows Server, Windows 11
Automation & Scripting
PowerShell, Python, Bash
Containerization
OpenShift, Podman, Docker
Virtualization
OpenShift, VMware vSphere, ESXi, ProxMox
Networking
TCP/IP, DNS, DHCP, firewalld
Monitoring
JIRA, SolarWinds, Riverbed, Git
Professional Experience
System Administrator III
Amentum | Oct 2024 - PresentAs a lead administrator in a cleared environment, I direct a technical team supporting an RPA (Remotely Piloted Aircraft) unit of over 500 service members where continuous uptime and minimal latency are critical. I manage a mixed infrastructure of virtualized Windows and Red Hat servers, proactively maintaining system health while utilizing Tenable for continuous vulnerability remediation and Jira for workflow management.
System Administrator, Lead
Peraton | Mar 2022 - Oct 2024Managed an enterprise virtualized infrastructure utilizing VMware vSphere and ESXi to oversee the complete virtual machine lifecycle. I significantly reduced manual administrative overhead by deploying custom PowerShell scripts for software deployment and system reporting, all while maintaining comprehensive technical documentation and SOPs.
IT Specialist / Team Leader
U.S. Army (1CD 3BCT) | Sep 2016 - Feb 2022Operating within a battalion S-6 shop, I managed the network, hardware, and security compliance for 450 personnel across both garrison and deployed environments. I developed technical SOPs and trained peer technicians to streamline troubleshooting, ensuring near-zero user downtime while hardening systems in accordance with DISA STIGs.
Featured Project
| Project Name | Description | Technologies |
|---|---|---|
| Home Lab Server | Designed and deployed a home server to deepen expertise in enterprise Linux environments, containerization, and system hardening. | Rocky Linux / Docker / Bash / firewalld |