Senior Systems Administrator

Our client is seeking a Senior Systems Administrator / Network Administrator to support and enhance a hybrid infrastructure environment across networking, cloud, security, systems administration, and enterprise operations.

This individual will serve as a key member of a small, highly visible infrastructure team.

Responsibilities

• Manage Cisco network infrastructure including routing, switching, VPNs, firewalls, and WAN connectivity
• Administer Palo Alto firewalls and network security controls
• Support Azure cloud infrastructure, networking, and security services
• Maintain Active Directory, DNS, DHCP, Group Policy, and Windows Server environments
• Manage VMware virtualization infrastructure and server operations
• Monitor and respond to Microsoft Sentinel and Defender security alerts
• Perform server patching, SCCM administration, and vulnerability remediation
• Manage enterprise DNS, SSL certificates, and external DNS platforms
• Coordinate with vendors including Cisco, Palo Alto, HPE Aruba, Equinix, and Microsoft
• Create and maintain infrastructure documentation, runbooks, and operational procedures

Experience

• 10+ years of Systems Administration and/or Network Administration experience
• Strong Cisco networking experience including routing, switching, and BGP
• Experience supporting Palo Alto firewalls
• Azure networking and hybrid cloud infrastructure experience
• Active Directory, DNS, DHCP, and Windows Server administration
• VMware administration and virtualization technologies
• SCCM and enterprise patch management
• Network security and infrastructure troubleshooting experience
• Experience supporting multi-site environments

Preferred Experience

• Financial Services, Investment Management, or Broker-Dealer environments
• SEC-regulated organizations
• Microsoft Sentinel and Defender
• Aruba/HPE networking
• Enterprise DNS and certificate management
• Acquisition or infrastructure integration projects
• Working within small IT infrastructure teams

Technical Environment

Networking: Cisco Routing & Switching, BGP, VPN, DNS, Palo Alto Firewalls

Cloud: Azure Infrastructure & Networking

Systems: Windows Server, Active Directory, VMware, SCCM

Security: Microsoft Sentinel, Microsoft Defender, Network Security Controls

Infrastructure: Hybrid Cloud, Multi-Site Enterprise Environment