Systems Administrator

CACI; Sterling (VA); On-site; USD 90,000 - 190,000; Full time

Job summary

CACI is seeking a Classified Systems Administrator to support and maintain mission-critical classified information systems in a secure environment. This role blends systems engineering, systems administration, cybersecurity, virtualization, and IA responsibilities to ensure reliability, security, and compliance of classified networks.

The ideal candidate will manage Windows Server infrastructure, virtualization platforms, enterprise applications such as Exchange and SQL Server, storage

Qualifications

• Bachelor's degree (or equivalent) with 7+ years of Systems Engineering and Systems Administration experience.
• Active TS SCI w/ Polygraph is required.
• CompTIA Security+ (or equivalent DoD-approved certification).
• Extensive experience administering Microsoft Windows Server environments, including installation, configuration, patch management, and performance optimization.
• Hands-on experience managing VMware, Hyper-V, and Nutanix virtualization environments.
• Experience implementing vulnerability remediation and security mitigations using enterprise security tools (e.g., Nessus).
• Strong knowledge of Microsoft Active Directory, DNS, DHCP, and Group Policy administration.
• Excellent troubleshooting, analytical, critical thinking, and problem-solving skills.
• Strong written and verbal communication skills with the ability to work independently and within cross-functional technical teams.

Responsibilities

• Install, configure, administer, and maintain Microsoft Windows Server operating systems across classified environments.
• Manage virtualization platforms including VMware, Hyper-V, and Nutanix, ensuring availability, performance, and security.
• Administer enterprise services and applications including Microsoft Exchange, Microsoft SQL Server, Skype for Business, Jira, and Confluence.
• Troubleshoot, analyze, and resolve hardware, software, networking, and infrastructure issues across multiple classified networks.
• Monitor system performance, apply operating system patches, and implement security mitigations using vulnerability scanning tools such as Nessus.
• Manage enterprise storage platforms including Pure Storage, Dell PowerVault, and Synology appliances.
• Administer privileged access and security solutions including RSA and CyberArk.
• Process classified user account requests, access modifications, and Active Directory administration in accordance with DoD and NISPOM requirements.

Skills

TS/SCI with Polygraph

CompTIA Security+

Active Directory

VMware

Hyper-V

Nutanix

Troubleshooting

Communication skills

Education

Bachelor's degree or equivalent

Tools

VMware

Hyper-V

Nutanix

Microsoft Exchange

Microsoft SQL Server

Jira

Confluence

Nessus

Pure Storage

Dell PowerVault

Synology

RSA

CyberArk

Job description

Job Title: Systems AdministratorJob Category: Information TechnologyTime Type: Full timeMinimum Clearance Required to Start: TS/SCI with PolygraphEmployee Type: RegularPercentage of Travel Required: Up to 10%Type of Travel: Local* * *

The Opportunity

CACI is seeking a Classified Systems Administrator to support and maintain mission-critical classified information systems in a secure environment. This role combines systems engineering, systems administration, cybersecurity, virtualization, and Information Assurance (IA) responsibilities to ensure the reliability, security, and compliance of classified networks. The ideal candidate will manage Windows Server infrastructure, virtualization platforms, enterprise applications, storage solutions, and security technologies. This position supports continuous system modernization in a high-security environment.

Responsibilities

• Install, configure, administer, and maintain Microsoft Windows Server operating systems across classified environments.
• Manage virtualization platforms including VMware, Hyper-V, and Nutanix, ensuring availability, performance, and security.
• Administer enterprise services and applications including Microsoft Exchange, Microsoft SQL Server, Skype for Business, Jira, and Confluence.
• Troubleshoot, analyze, and resolve hardware, software, networking, and infrastructure issues across multiple classified networks.
• Monitor system performance, apply operating system patches, and implement security mitigations using vulnerability scanning tools such as Nessus.
• Manage enterprise storage platforms including Pure Storage, Dell PowerVault, and Synology appliances.
• Administer privileged access and security solutions including RSA and CyberArk.
• Process classified user account requests, access modifications, and Active Directory administration in accordance with DoD and NISPOM requirements.

Qualifications

Required

• Bachelor's degree (or equivalent experience) with 7+ years of Systems Engineering and Systems Administration experience.
• Active TS SCI w/ Polygraph is required.
• CompTIA Security+ (or equivalent DoD-approved certification).
• Extensive experience administering Microsoft Windows Server environments, including installation, configuration, patch management, and performance optimization.
• Hands‑on experience managing VMware, Hyper-V, and Nutanix virtualization environments.
• Experience implementing vulnerability remediation and security mitigations using enterprise security tools (e.g., Nessus).
• Strong knowledge of Microsoft Active Directory, DNS, DHCP, and Group Policy administration.
• Excellent troubleshooting, analytical, critical thinking, and problem-solving skills.
• Strong written and verbal communication skills with the ability to work independently and within cross-functional technical teams.
• Demonstrated commitment to continuous learning and supporting mission-critical classified environments.

Desired

• Experience administering Microsoft SQL Server.
• Experience administering Microsoft SharePoint Server.
• Experience supporting Skype for Business and Microsoft MECM/SCCM environments.
• Experience managing McAfee/Trellix endpoint security solutions.
• Experience with enterprise backup solutions such as Nakivo and Commvault.
• Experience supporting classified Information Assurance processes, Security Impact Analyses (SIAs), DCSA compliance, and secure data transfer operations.

What You Can Expect

A culture of integrity.

At CACI, we place character and innovation at the center of everything we do. As a valued team member, you’ll be part of a high-performing group dedicated to our customer’s missions and driven by a higher purpose – to ensure the safety of our nation.

An environment of trust.

CACI values the unique contributions that every employee brings to our company and our customers - every day. You’ll have the autonomy to take the time you need through a unique flexible time off benefit and have access to robust learning resources to make your ambitions a reality.

A focus on continuous growth.

Together, we will advance our nation's most critical missions, build on our lengthy track record of business success, and find opportunities to break new ground — in your career and in our legacy.

Pay Range

There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications. Our employees value the flexibility at CACI that allows them to balance quality work and their personal lives. We offer competitive compensation, benefits and learning and development opportunities. Our broad and competitive mix of benefits options is designed to support and protect employees and their families. At CACI, you will receive comprehensive benefits such as; healthcare, wellness, financial, retirement, family support, continuing education, and time off benefits.

Since this position can be worked in more than one location, the range shown is the national average for the position.

The proposed salary range for this position is:

$90,300-$189,600

CACI is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, age, national origin, disability, status as a protected veteran, or any other protected characteristic.