Senior Network Security Engineer - Firewalls & Multi-Site

Quantum Technologies. LLC; New York (NY); On-site; USD 89,000 - 126,000; Full time

Job summary

Quantum Technologies. LLC is seeking a Network Security Engineer for a 12-month contract in Liverpool, NY. The role involves owning enterprise-grade firewall management, routing and switching troubleshooting, and supporting multiple remote sites and datacenters.

The candidate will perform vulnerability assessments, patching, monitoring, and documentation, with up to 25% travel. US work authorization is required; 12 months plus extension possible.

Qualifications

• 3+ years hands-on network engineering/security experience with strong knowledge of firewalls, routers, switches, TCP/IP, VPNs, DNS, DHCP, SNMP, load balancing, and network troubleshooting.

Responsibilities

• Manage and maintain enterprise-grade firewalls.
• Configure and troubleshoot routing and switching infrastructure.
• Support multi-site network environments and remote datacenters.
• Perform vulnerability assessments and remediation activities.
• Maintain patching, backups, monitoring, and network security tools.
• Participate in 24x7 on-call rotation.
• Create and maintain network diagrams and documentation.
• Travel up to 25% to support sites and infrastructure projects.

Skills

Network security

Firewall administration

Routing

Switching

Network monitoring

Vulnerability assessment

Log management

Backup and recovery

Hardware deployment

Cisco IOS upgrades

Remote site support

Tools

Cisco IOS

Microsoft Visio

Job description

Quantum Technologies. LLC is seeking a Network Security Engineer for a 12-month contract in Liverpool, NY. The role involves owning enterprise-grade firewall management, routing and switching troubleshooting, and supporting multiple remote sites and datacenters.

The candidate will perform vulnerability assessments, patching, monitoring, and documentation, with up to 25% travel. US work authorization is required; 12 months plus extension possible.