System Administrator

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 seeks a motivated, career and customer-oriented System Administrator to join our team in Laurel, MD. You will be part of a dedicated team delivering enterprise infrastructure capabilities for a global workforce that supports a wide range of national defense missions. This role directly supports the Enterprise Infrastructure Services (EIS) organization—the foundation of all Enterprise Information Technology (EIT) for MPO.

Responsibilities include but are not limited to:

• Configure, administer, and maintain Windows Server operating systems, Active Directory (AD), and associated enterprise services.
• Administer VMware environments utilizing vCenter and ESXi, with a primary focus on user/account management, permissions, resource allocation, and baseline virtual machine (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 operating system troubleshooting and support where integrated with enterprise environments.
• Support dispatch systems, hardware diagnostics, and problem resolution across enterprise infrastructure.
• Monitor system health, optimize system operations, and participate in capacity analysis and performance tuning.
• Analyze and resolve Tier II/III problems associated with server hardware, operating systems, applications, and enterprise software integration.

Minimum Qualifications:

• Bachelor’s degree in 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 is required.
• Demonstrated experience in planning and leading Systems Engineering/Administration efforts is required.
• Proven hands‑on experience in Windows Server administration, user account management, and group policy (GPO).
• Hands‑on experience with VMware vCenter and ESXi
• Demonstrated experience with modern automation, configuration or 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).

Preferred Qualifications:

• Microsoft Certified: Windows Server Hybrid Administrator Associate or equivalent enterprise Windows certification.
• VMware Certified Technical Associate (VCTA) or VMware Certified Professional (VCP).
• Experience with enterprise storage platforms, particularly NetApp.
• Experience supporting cross‑platform integration between Windows Active Directory and Red Hat Enterprise Linux (RHEL) systems.
• Scripting capability (e.g., PowerShell, Bash) for automating routine administrative tasks and account workflows.

Clearance Requirements:

• Must have a current/active Top Secret/SCI with Polygraph.

Physical Requirements:

• The person in this position must be able to remain in a stationary position 50% of the time.
• Occasionally move about inside the office to collaborate with other leaders/teams, use standard office automation equipment, and engage in virtual communication.

MANTECH International Corporation considers all qualified applicants for employment without regard to disability or veteran status or any other status protected under any federal, state, or local law or regulation.

If you need a reasonable accommodation to apply for a position with MANTECH, please email us at [e-mail] and provide your name and contact information.