System Administrator - LAN/WAN Infrastructure

We are seeking a skilled System Administrator with strong experience in LAN/WAN infrastructure, network administration, server management, and IT infrastructure support. The successful candidate will be responsible for maintaining and troubleshooting enterprise IT infrastructure, ensuring network and systems availability, supporting users and applications, and working with internal teams and vendors to resolve infrastructure-related issues. This is a Contract-to-Hire opportunity in New Jersey, with the potential for conversion to a permanent position based on performance and business requirements. Responsibilities Manage, maintain, and troubleshoot LAN/WAN network infrastructure. Configure and support routers, switches, firewalls, VPNs, and wireless infrastructure. Monitor network performance, availability, bandwidth, and system health. Troubleshoot network connectivity, routing, switching, DNS, DHCP, and VPN issues. Configure and manage VLANs, TCP/IP, NAT, routing, and network security. Administer Windows Server environments, Active Directory, DNS, DHCP, and Group Policy. Perform server installation, configuration, patching, upgrades, and maintenance. Manage user accounts, permissions, security groups, and access policies. Support firewalls and site-to-site/remote-access VPN solutions. Monitor infrastructure using network and system monitoring tools. Troubleshoot hardware, operating system, network, and application-related issues. Support backup, disaster recovery, and business continuity processes. Coordinate with ISPs, network providers, hardware/software vendors, and third-party support teams. Maintain network diagrams, infrastructure documentation, configurations, and asset records. Participate in infrastructure upgrades, migrations, and implementation projects. Provide Level 2/Level 3 infrastructure support and resolve incidents within established SLAs. Identify potential infrastructure issues proactively and recommend improvements., The ideal candidate is a hands-on System Administrator who can work across both systems and network infrastructure, troubleshoot LAN/WAN issues, administer Windows environments, and collaborate effectively with network, security, application, and vendor teams. Core Keywords: System Administrator | Systems Administrator | Network Administrator | LAN/WAN | Network Infrastructure | Cisco | Routing | Switching | VLAN | TCP/IP | Firewall | VPN | DNS | DHCP | Active Directory | Windows Server | Linux | Fortinet | Palo Alto | Aruba | IT Infrastructure | Network Troubleshooting | Contract-to-Hire | C2H | New Jersey

4 7+ years of experience in System Administration / IT Infrastructure. Strong hands-on experience with LAN/WAN environments. Solid understanding of: TCP/IP DNS/DHCP VLANs Routing & Switching NAT VPN Firewalls Network troubleshooting Experience with Cisco, Aruba, HP, Fortinet, Palo Alto, Sophos, or equivalent technologies. Strong knowledge of Windows Server and Active Directory. Experience with Group Policy, user administration, and server troubleshooting. Working knowledge of Linux/Unix environments is a plus. Experience with backup, patch management, endpoint security, and disaster recovery. Strong analytical, troubleshooting, and problem-solving abilities. Excellent written and verbal communication skills. Preferred Qualifications CCNA / Network+ Security+ Microsoft Windows Server / Azure certifications Fortinet, Palo Alto, or other firewall certifications Experience supporting multi-site enterprise environments. Contract-to-Hire Requirements Must be authorized to work in the United States. Must be willing to work in New Jersey based on the client’s onsite/hybrid requirements. Must be comfortable with a Contract-to-Hire/C2H arrangement. Strong communication and interpersonal skills. Ability to work independently as well as with infrastructure and IT support teams.