Senior Systems Administrator

Scott Stephenson

Commerce City, CO, USA +1-757-***-**** ****************@*******.*** linkedin.com/in/scott-c-stephenson-jr

Senior Systems Administrator Linux Infrastructure Data Center Operations Reliability Engineering

Professional Summary

Senior systems administrator with 10+ years of experience supporting mission-critical Linux, virtualized, storage, and networked environments in defense, healthcare-adjacent, and enterprise settings. Background includes large-scale infrastructure operations, Bash-driven automation, hybrid infrastructure, troubleshooting across hardware, software, and networking layers, and vulnerability remediation in high-availability environments. Proven record of improving reliability, supporting uninterrupted operations, and collaborating with distributed technical teams. Open to relocation to Amsterdam for the right infrastructure or site reliability opportunity.

Core Competencies

Linux Systems Administration

Bash Scripting & Automation

VMware vSphere / NSX-T / vRA

Troubleshooting Hardware, Software & Network Issues

High-Availability & Mission-Critical Environments

Vulnerability Assessment & Remediation

System Hardening & Secure Configuration

Storage, SAN, NAS & NFS

Active Directory & GPO

Cisco Switching & Routing

Ansible / Chef

Cross-Functional Operations Support

Professional Experience

Provisioning Team Member Mission Consulting and Services Remote Sep 2025 - Present

Provision and configure enterprise user accounts for Department of Veterans Affairs personnel supporting a nationwide Oracle Health EHR migration.

Support secure access, rollout, and cutover activities in a large, multi-site healthcare transformation environment where operational continuity and accuracy are critical.

Coordinate with distributed technical teams to resolve account, access, and environment issues quickly while maintaining uninterrupted service delivery across production environments.

Owner / Operator Reunion Martial Arts Commerce City, CO Apr 2025 - Present

Lead day-to-day operations for a multi-program business, including staffing, scheduling, vendor coordination, customer support, and process improvement.

Manage digital workflows, service delivery systems, and standard operating procedures across memberships, after-school transportation, camps, events, and community programs.

Senior Systems Administrator Beacon Hill Technologies (assigned to Raytheon IIS) Aurora, CO Jun 2020 - Mar 2025

Administered compliance, vulnerability remediation, and security hardening for mission-critical Linux systems in a large-scale federal contract environment.

Built and maintained hybrid infrastructure spanning 42 physical ESXi hosts, 73 tenants, and 4,800+ virtual machines using VMware vSphere, NSX-T, and vRealize Automation.

Automated recurring operational changes and systems administration tasks through Bash scripting, Chef recipes, and Ansible playbooks to improve consistency and reduce manual effort.

Executed SCAP and vulnerability assessments using SCC and Tenable/Nessus, documented remediation strategies, and drove follow-through aligned with secure configuration requirements.

Troubleshot complex system issues across Linux-based platforms, virtualization layers, networking components, and integrated software environments, including core services such as DNS, DHCP, and NTP.

Systems Administrator II Lockheed Martin Space Boulder, CO Nov 2018 - May 2020

Administered compliance and vulnerability management activities aligned with NIST-based security requirements in a mission-focused environment.

Built and supported a 100+ node lab environment, integrated Ansible automation, managed Active Directory and GPO configuration, and supported disaster recovery planning and execution.

Performed root cause analysis and resolved complex issues across Linux and Windows systems while coordinating resolutions through Jira and cross-functional teams.

Senior Field Technician Lockheed Martin RMF Norfolk, VA Aug 2017 - Oct 2018

Administered and tested high-availability Red Hat and RedHawk network file systems and network-attached storage supporting critical data center operations.

Maintained RAID and SAN infrastructure, performed data and filesystem maintenance, and supported servers, clients, and nodes across LAN-connected environments.

Installed, configured, and repaired hardware for servers, Cisco layer 2/3 switches, thin-client workstations, and printers while providing technical support in time-sensitive operational environments.

Aegis Computer Network Technician U.S. Navy (USS Antietam CG-54) Yokosuka, Japan Jun 2013 - Oct 2016

Served as Security Systems Administrator for the Aegis LAN, supporting Red Hat and RedHawk Linux servers, clients, and remote stations aboard a U.S. Navy warship.

Led five technicians in operations, troubleshooting, maintenance, and readiness activities for mission-critical shipboard systems.

Education

Master of Business Administration (MBA), In Progress

M.S., Information Assurance and Cybersecurity, Capella University, 2021

B.S., Information Technology, Capella University, 2019

Technical Skills & Certifications

Linux and Windows systems administration; VMware vSphere, NSX-T, vRealize Automation; LAN/WAN, Cisco switching/routing; DNS, DHCP, NTP; RAID, SAN, NAS, NFS, TCP/IP

Security and reliability: vulnerability assessments, Tenable/Nessus, SCC, SCAP scanning, secure configuration, system hardening, technical documentation, high-availability support

Automation: Bash, PowerShell, Chef, Ansible

Certifications: CISSP (2024); CompTIA Security+ (2018); former AWS Cloud Practitioner

Contact this candidate