Candidate ID: #34
Location: Falls Church, VA (not willing to relocate; 0% travel)
Clearance: TS/SCI w/ CI Polygraph (10/2025)

EMPLOYMENT SUMMARY

  • Current/Most Recent: 2+ years (May 2023 – Present) across systems engineering roles supporting defense and intelligence agencies – Led a side-by-side migration of legacy domain controllers to Windows Server 2022, stood up VMware vSphere 8 across two sites, and administered enterprise DNS/DHCP/IPAM in classified environments
  • Past: 18+ years of progressive systems administration and engineering across DoD, intelligence, and civilian federal environments – Deep experience in VMware vSphere (5.x through 8.x), Active Directory and Group Policy, Microsoft Exchange migrations, STIG-based hardening, patch management, and Tier 3 infrastructure support

ACCOMPLISHMENTS

  • Virtualization & VMware Engineering – Deployed and configured ESXi hosts and vCenter Server Appliances across multiple sites, built HA clusters and distributed switches, provisioned a 400 TB+ vSAN pooled from 32 SSDs, and previously administered a 24/7/365 enterprise environment of 60 ESXi hosts and 550 VMs across eight networks and DR sites
  • Windows Server & Active Directory Migration – Executed forest preparation and SYSVOL FRS-to-DFSR conversion, transferred all five FSMO roles, deployed failover DHCP, demoted legacy DCs with full metadata cleanup, and managed OUs, GPOs, trusts, security groups, and account provisioning across seven enclaves
  • Security Compliance & Hardening – Applied DISA STIGs, SCAP/SCC scans, and security patches within mandated timelines, implemented PKI certificates for vCenter and ESXi hosts using OpenSSL, configured DNSSEC and DNS security policies, and supported accreditation package documentation
  • Messaging, Cloud & Patch Management – Designed and migrated Exchange environments (2003→2010, 2007→2010, 2010→2016) with DAG and NLB high availability, deployed Windows and Exchange instances in AWS EC2 with EBS snapshot-based disaster recovery, and managed enterprise patching via WSUS, VUM, and LANDesk

Credentials: B.S. Computer Networking (Cum Laude); CompTIA SecurityX CE and Network+; MCSE (Server 2012 Infrastructure, Server 2016 Cloud Platform); VCP-DCV on vSphere 6.5, 6.7, 7.x, 8.x, and VMware Cloud Foundation Administrator on vSphere 9.x

Oscar Cambrelen prides Himself on being not only an executive recruiter focused on engaging talent but also an industry expert dedicated to client objectives and continuous growth. He continually seeks to help businesses grow and flourish to the next level.

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