Senior Network & Cloud Security Administrator

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 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.