System Administrator (Windows/VMware) DoD IT Top Secret/SCI

ManTech; Laurel (MD); On-site; USD 90,000 - 130,000; Full time

Job summary

MANTECH is seeking a System Administrator in Laurel, MD to maintain Windows Server environments, AD, and VMware platforms for a national defense-focused IT environment. The role supports enterprise infrastructure operations and requires TS/SCI with Polygraph clearance.

The candidate will administer vCenter/ESXi, manage user accounts and GPOs, and collaborate across teams to ensure system reliability. Linux support and automation skills with PowerShell or Ansible are a plus.

Qualifications

• Bachelor’s degree in a technical discipline from an accredited college or university.
• 20 years’ experience as a System Engineer/System Administrator in programs and contracts of similar scope, type and complexity.
• Demonstrated experience in planning and leading Systems Engineering/Administration efforts.
• Hands-on experience with Windows Server administration, user account management, and group policy (GPO).
• Hands-on experience with VMware vCenter and ESXi.
• Demonstrated experience with automation/monitoring tools such as Splunk, PowerShell or Ansible.
• IAT Level II certification (DoD 8140 required within 60 days of starting employment; acceptable certifications include Security+ CE, CCNA‑Security, CySA+, GICSP, GSEC, CND, or SSCP).

Responsibilities

• Configure, administer, and maintain Windows Server operating systems, Active Directory and enterprise services.
• Administer VMware environments utilizing vCenter and ESXi, focused on user accounts, permissions and VM troubleshooting.
• Provide support for implementation, troubleshooting, and day-to-day operations of IT systems, client/server hardware, storage and network devices.
• Assist with basic Linux troubleshooting in enterprise environments.
• Support dispatch systems, hardware diagnostics, and problem resolution across enterprise infrastructure.
• Monitor system health, optimize operations, and participate in capacity analysis and performance tuning.
• Analyze and resolve Tier II/III problems related to server hardware, OS, applications and enterprise software integration.

Skills

Windows Server administration

Active Directory

User account management

Group Policy (GPO)

PowerShell

Ansible

Splunk

IAT Level II (DoD 8140)

Education

Bachelor’s degree in a technical discipline

Tools

VMware vCenter

ESXi

NetApp

Job description

MANTECH is seeking a System Administrator in Laurel, MD to maintain Windows Server environments, AD, and VMware platforms for a national defense-focused IT environment. The role supports enterprise infrastructure operations and requires TS/SCI with Polygraph clearance.

The candidate will administer vCenter/ESXi, manage user accounts and GPOs, and collaborate across teams to ensure system reliability. Linux support and automation skills with PowerShell or Ansible are a plus.