Senior System Administrator — DoD Secure, TS/SCI

Phase2 Technology; Maryland; On-site; USD 99,000 - 225,000; Full time

Job summary

Booz Allen Hamilton seeks an experienced system administrator to secure and modernize our Windows and Linux environments in support of DoD missions. You will manage AD/DNS/DHCP, virtualization, and cross-functional collaboration to meet strict security and performance targets.

Applicants must have TS/SCI with polygraph and DoD 8140/8570 familiarity. Strong scripting and cloud experience are required. The role emphasizes reliability, documentation, and incident response.

Qualifications

• Experience with Windows and Linux system administration.
• Experience with cloud platforms such as AWS, Azure, GovCloud.
• Experience with virtualization such as VMware or Hyper-V.
• Experience with scripting (PowerShell, Bash, Python).
• Experience with networking fundamentals (TCP/IP, VLANs, routing, switches, firewalls).
• Experience with monitoring, logging, troubleshooting, and performance tuning.
• Experience supporting secure, classified environments.
• DoD 8140/8570 certification topics such as Security+, CySA+, CCNA, or CASP+.
• Bachelor’s degree or 15+ years of experience in lieu of degree.

Responsibilities

• Install, configure, secure, maintain, and optimize Windows and Linux OS.
• Maintain Active Directory, DNS, DHCP, PKI, and core services.
• Administer and support virtualization (VMware, Hyper-V).
• Maintain system documentation and baselines.
• Apply DoD cybersecurity requirements (STIGs, RMF, ACAS/Tenable).
• Provide Tier 1-3 support for server/storage/network issues.
• Monitor performance, uptime, and capacity; perform root cause analysis.
• Execute system patching, backups, and disaster recovery planning.
• Support integration of new technologies and upgrades.
• Collaborate with cybersecurity, network engineering, and software development.

Skills

Windows system administration

Linux system administration

AWS

Azure

GovCloud

PowerShell

Bash

Python

TCP/IP

VLANs

routing & switching

firewalls

log analysis

vulnerability remediation

Education

Bachelor's degree

Tools

VMware

Hyper-V

Active Directory

DNS

Job description

Booz Allen Hamilton seeks an experienced system administrator to secure and modernize our Windows and Linux environments in support of DoD missions. You will manage AD/DNS/DHCP, virtualization, and cross-functional collaboration to meet strict security and performance targets.

Applicants must have TS/SCI with polygraph and DoD 8140/8570 familiarity. Strong scripting and cloud experience are required. The role emphasizes reliability, documentation, and incident response.