System and Network Administrator

Dunhill Solutions • Germantown, MD

4d

About The Position

Seeking a versatile and highly skilled Systems and Network Administrator to design, secure, and maintain a hybrid enterprise infrastructure. The role serves as the technical backbone of operations, with responsibility for on-premises Cisco and Juniper networking, Palo Alto security systems, Windows Server administration, and Microsoft Azure cloud environments. The position bridges local hardware and cloud services to ensure a seamless, secure, and reliable environment across the system lifecycle.

The administrator configures and maintains network, server, and cloud infrastructure; enforces security controls; monitors performance and availability; and supports infrastructure upgrades, migrations, and deployments. The role also provides Tier II/III incident support, maintains technical documentation and configuration records, and follows established change management processes.

Requirements

• Bachelor's degree in Information Technology, Computer Science, another relevant field, or equivalent relevant experience.
• 8–15 years of experience in Systems Engineering/Analysis.
• Strong experience administering Windows Server environments, including Active Directory, Group Policy, DNS, DHCP, and server security benchmarking.
• Hands-on Microsoft Azure administration experience, including virtual machines, virtual networks, Entra ID, storage, and IAM.
• Working knowledge of Cisco networking, including Catalyst/Nexus switches, routers, and wireless, and of Juniper switches.
• Direct experience configuring and supporting Palo Alto Networks firewalls.
• Understanding of TCP/IP, VLANs, routing protocols such as OSPF and BGP, VPN technologies, and defense-in-depth security principles.
• Experience with network/system monitoring and troubleshooting tools, such as SolarWinds, Wireshark, Azure Monitor, and Event Viewer.
• Ability to read, update, and maintain detailed network/system diagrams and operational documentation.
• Ability to support Windows, macOS, and Linux endpoints connected to enterprise networks.

Nice To Haves

• Master's degree preferred.
• Advanced computing certification preferred.
• Palo Alto certifications such as PCNSA or PCNSE.
• Cisco certifications such as CCNA or CCNP.
• Juniper Networks certifications such as JNCIA, JNCIS, or JNCIP.
• Familiarity with PowerShell, Azure CLI, or infrastructure-as-code tools such as Terraform or ARM templates for automation.
• Experience with Zero Trust concepts, MFA, SSO, and modern security architectures.
• Strong troubleshooting, documentation, and communication skills, and ability to work independently on complex, multi-site infrastructure tasks.
• Microsoft Certified: Azure Administrator Associate (AZ-104) or equivalent.

Responsibilities

• Configure, maintain, and troubleshoot Juniper and Cisco switches, routers, and wireless infrastructure.
• Administer Palo Alto firewalls, including security policies, NAT rules, VPNs, and threat prevention features.
• Manage site-to-site and remote-access VPNs to ensure secure, reliable connectivity.
• Monitor network performance, availability, and capacity using approved tools.
• Perform routine maintenance, firmware upgrades, and hardware lifecycle tasks for network devices.
• Install, configure, and maintain Windows Server 2016, 2019, and 2022 in physical and virtual environments.
• Manage Active Directory and Microsoft Entra ID, including organizational units, Group Policy Objects, permissions, and hybrid identity synchronization.
• Administer DNS, DHCP, and PKI/certificate management services.
• Implement and monitor patching schedules, system backups, and disaster recovery procedures for server infrastructure.
• Support Hyper-V and VMware ESXi virtualization technologies where applicable.
• Deploy, configure, and manage Azure resources, including virtual machines, virtual networks, network security groups, storage accounts, and Key Vaults.
• Monitor cloud resource utilization, performance, and costs, and implement optimization strategies where appropriate.
• Support Azure-native backup, recovery, and logging tools, including Azure Monitor, Log Analytics, and Azure Backup.
• Maintain secure hybrid connectivity between on-premises infrastructure and the Azure tenant.
• Implement and enforce system and network security policies, network segmentation, access controls, and the Principle of Least Privilege.
• Manage identity and access management across local domains and cloud environments.
• Work with security teams to remediate vulnerabilities and maintain compliance with organizational standards.
• Maintain documentation of firewall rules, server configurations, network diagrams, and cloud architectures.
• Provide Tier II/III support for network, server, and cloud incidents, outages, and performance issues.
• Diagnose and resolve complex issues involving routing, switching, operating-system performance, Active Directory replication, and cloud service disruptions.
• Maintain up-to-date configuration records in the CMDB.
• Follow established change management processes for network, system, and cloud modifications.
• Assist with planning and executing infrastructure upgrades, migrations, and new deployments.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior