DEREK HOLLOWAY, RHCE, MCSA

Senior Systems Administrator

Dallas, TX

derek.holloway@email.com

(555) 017-8492

linkedin.com/in/derekholloway-sysadmin

github.com/derekholloway

Skills

Linux Administration

Cloud Infrastructure (AWS/Azure)

VMware ESXi & vSphere

Kubernetes & Docker

CI/CD Pipeline Management

Infrastructure as Code (Terraform)

Network Security & Firewalls

Bash & Python Scripting

Disaster Recovery & Backup

Incident Management & Troubleshooting

Certifications

Red Hat Certified Engineer (RHCE)

Jan, 2023

Red Hat

Red Hat Certified System Administrator (RHCSA)

Jan, 2021

Red Hat

Microsoft Certified: Windows Server Hybrid Administrator Associate

Jan, 2024

Microsoft

Summary

Versatile and results-oriented Systems Administrator with 7+ years of experience engineering, securing, and maintaining hybrid enterprise infrastructure across Linux (RHEL, Ubuntu) and Windows Server environments. Specialized in high-availability clustering, hypervisor virtualization (VMware ESXi, Proxmox), automated configuration management (Ansible), and enterprise identity governance (Active Directory, Entra ID). Proven track record of sustaining 99.99% system uptime across 600+ virtual and physical servers, cutting provisioning turnaround from days to minutes, and slashing routine sysadmin toil by 50% via automated scripting.

Work experience

Senior Systems Administrator

May 2022 - Present

Pinnacle Financial Technologies

Location: Dallas, TX

Administer, secure, and monitor a high-availability hybrid infrastructure of 450+ physical and virtual servers (65% RHEL, 35% Windows Server) supporting 2,500+ employees.
Engineered Ansible automation playbooks to manage OS baseline hardening, patch compliance, and user account provisioning, eliminating 20+ hours of manual administrative toil weekly.
Upgraded and consolidated enterprise VMware vSphere 7.x clusters across 2 primary data centers to vSphere 8.0, reducing hypervisor host count by 25% while boosting compute density.
Governed identity governance and access control in hybrid Active Directory and Microsoft Entra ID, redesigning GPOs to enforce CIS Benchmarks and strict least-privilege access across all domain machines.
Re-architected enterprise disaster recovery routines with Veeam Backup & Replication and off-site cloud tiering, reducing Recovery Point Objective (RPO) from 12 hours to under 30 minutes and Recovery Time Objective (RTO) to under 2 hours.
Partnered with the Information Security team to remediate 800+ vulnerability scan findings, maintaining 100% compliance during annual SOC 2 Type II and PCI-DSS external audits.
Led a 24/7 on-call escalation rotation, sustaining 99.99% core infrastructure uptime and reducing Mean Time to Resolution (MTTR) for system alerts by 42%.

Systems Administrator

Jul 2019 - Apr 2022

Nexa Health Systems

Location: Fort Worth, TX

Built and maintained 150+ Windows and Ubuntu servers in an on-premises enterprise environment handling electronic health records (EHR).
Administered core network infrastructure services, including multi-subnet DHCP scopes, internal DNS zones, and split-tunnel VPN profiles for remote personnel.
Automated routine weekly OS security patch cycles using WSUS and Red Hat Satellite, achieving a consistent 98% fleet patch compliance rate within 7 days of patch releases.

Education

Bachelor of Science in Information Technology & Systems

Jan 2013 - Dec 2017

University of Texas at Dallas

DEREK HOLLOWAY, RHCE, MCSA

Skills

Certifications

Red Hat Certified Engineer (RHCE)

Red Hat Certified System Administrator (RHCSA)

Microsoft Certified: Windows Server Hybrid Administrator Associate

Summary

Work experience

Senior Systems Administrator

Systems Administrator

Education

Bachelor of Science in Information Technology & Systems

Projects

Automated Bare-Metal to Virtual Migration (P2V)