Senior Network Administrator (Secret Clearance 26-156) with Security Clearance

Strategic Analysis Incorporated; Arlington (VA); Hybrid; USD 120,000 - 135,000; Full time

Job summary

Strategic Analysis, Inc. is seeking an experienced Network Administrator to support, maintain, and enhance our on-premise and cloud based IT infrastructure in a hybrid Arlington environment.

This role emphasizes high availability, security, compliance, and performance across enterprise systems. The ideal candidate will manage physical network devices, Microsoft 365, identity services, and virtualization while upholding Zero Trust and backup strategies.

Qualifications

• 3-7+ years of experience in network or systems administration.
• Strong understanding of networking fundamentals: TCP/IP, DNS, DHCP, VLANs, routing, switching, and VPN technologies.
• Hands-on experience with enterprise-grade network hardware (Fortinet switches, Fortigate firewall, Dell EMC and Chassis, Sophos firewall, , etc.).
• Proficiency with Windows Server administration and Active Directory.
• Experience with Microsoft 365 administration and hybrid identity environments.
• Familiarity with Azure AD/Entra ID, Conditional Access, MFA, and Azure AD Connect.
• Experience with virtualization platforms (VMware ESXi,).
• Familiarity with network monitoring and packet analysis tools (PRTG, SolarWinds).
• Strong understanding of network and cloud security best practices.
• Ability to troubleshoot complex issues across hybrid environments.
• Strong documentation and communication skills.
• Active government Secret or higher-level clearance, or ability to obtain and maintain the clearance required.

Responsibilities

• Administer, monitor, and maintain on_premise network infrastructure including switches, routers, firewalls, wireless systems, and VPN solutions.
• Configure and manage LAN/WAN environments, VLANs, routing protocols, and network segmentation.
• Manage Windows Server environments, including Active Directory, DNS, DHCP, and Group Policy.
• Support virtualization platforms such as VMware ESXi or Hyper_V, including VM provisioning and performance optimization.
• Administer Microsoft 365 services (Exchange Online, Teams, SharePoint, OneDrive) and maintain hybrid configurations.
• Manage Azure AD/Entra ID identity services, including MFA, Conditional Access, SSO, and Azure AD Connect.
• Configure and maintain Intune/Endpoint Manager for device compliance, configuration profiles, and Autopilot deployments.
• Implement and maintain network and cloud security policies, including firewall rules, DLP, Defender for Office 365, and Zero Trust principles.
• Monitor network and system performance using tools such as, PRTG, or; respond to alerts and outages.
• Perform root_cause analysis and resolve escalated technical issues across both cloud and on_prem environments.
• Support disaster recovery planning, backups, and failover testing.
• Maintain accurate documentation including network diagrams, configuration records, and SOPs.
• Participate in infrastructure upgrades, cloud migrations, and modernization initiatives.
• Collaborate with IT team members to support end users and evolve issues when necessary.

Skills

3-7+ years experience

Networking fundamentals

Fortinet Fortigate

Dell EMC hardware

Sophos firewall

Windows Server & AD

Microsoft 365 admin

Azure AD/Entra ID

VMware ESXi

PRTG/SolarWinds

Cloud security

Hybrid troubleshooting

Documentation/communication

Secret clearance

Tools

Fortinet hardware

Fortigate firewall

Dell EMC hardware

Sophos firewall

VMware ESXi

Job description

Strategic Analysis, Inc. is an Equal Opportunity Employer. Senior Network Administrator (Secret Clearance #26-156) Job Code:26-156

Location: Arlington, VA - Hybrid

FT/PT Status: Full Time

Required Clearance: Secret

Salary Range: $120k-$135k

Strategic Analysis is seeking an experienced Network Administrator to support, maintain, and enhance our on-premise and cloud based IT infrastructure. This role is responsible for ensuring high availability, security, compliance, and performance across all enterprise systems by managing the physical network systems (switches, firewalls, servers, etc.) as well as Microsoft 365 (Azure AD/Entra ID, Intune, etc.). The ideal candidate is a versatile, hands-on professional who can troubleshoot complex issues, strengthen security, and ensure seamless connectivity across hybrid environments.

Requirements

• 3 -7+ years of experience in network or systems administration.


• Strong understanding of networking fundamentals: TCP/IP, DNS, DHCP, VLANs, routing, switching, and VPN technologies.


• Hands-on experience with enterprise-grade network hardware (Fortinet switches, Fortigate firewall, Dell EMC and Chassis, Sophos firewall, , etc.).


• Proficiency with Windows Server administration and Active Directory.


• Experience with Microsoft 365 administration and hybrid identity environments.


• Familiarity with Azure AD/Entra ID, Conditional Access, MFA, and Azure AD Connect.


• Experience with virtualization platforms (VMware ESXi,).


• Familiarity with network monitoring and packet analysis tools (PRTG, SolarWinds).


• Strong understanding of network and cloud security best practices.


• Ability to troubleshoot complex issues across hybrid environments.


• Strong documentation and communication skills.


• Active government Secret or higher-level clearance, or ability to obtain and maintain the clearance required.

Responsibilities

• Administer, monitor, and maintain on_premise network infrastructure including switches, routers, firewalls, wireless systems, and VPN solutions.


• Configure and manage LAN/WAN environments, VLANs, routing protocols, and network segmentation.


• Manage Windows Server environments, including Active Directory, DNS, DHCP, and Group Policy.


• Support virtualization platforms such as VMware ESXi or Hyper_V, including VM provisioning and performance optimization.


• Administer Microsoft 365 services (Exchange Online, Teams, SharePoint, OneDrive) and maintain hybrid configurations.


• Manage Azure AD/Entra ID identity services, including MFA, Conditional Access, SSO, and Azure AD Connect.


• Configure and maintain Intune/Endpoint Manager for device compliance, configuration profiles, and Autopilot deployments.


• Implement and maintain network and cloud security policies, including firewall rules, DLP, Defender for Office 365, and Zero Trust principles.


• Monitor network and system performance using tools such as, PRTG, or; respond to alerts and outages.


• Perform root_cause analysis and resolve escalated technical issues across both cloud and on_prem environments.


• Support disaster recovery planning, backups, and failover testing.


• Maintain accurate documentation including network diagrams, configuration records, and SOPs.


• Participate in infrastructure upgrades, cloud migrations, and modernization initiatives.


• Collaborate with IT team members to support end users and evolve issues when necessary.

Preferred Qualifications

• Fortinet NSE Certifications


• CompTIA Network+ or Security+.


• Experience with SAN/NAS storage systems.


• Microsoft 365 Administrator Expert or Azure Administrator Associate (AZ_104).


• Experience with backup and disaster recovery tools (Druva, Veeam, etc.).


• Knowledge of physical cabling standards and data center best practices.

Strategic Analysis, Inc. is an Equal Opportunity employer and is committed to non-discrimination in employment. All qualified applicants will receive consideration for employment without regard to race, color, religions, sex (including pregnancy, sexual orientation, or gender identity), national origin, disability (physical or mental), age (40 or older), protected veteran status, genetic information (including family medical history) or any other characteristic protected by law. This policy includes but is not limited to the following employment actions: recruitment, hiring, firing, promotion, demotion, compensation, fringe benefits, training, mentoring and sponsorship programs.