Network Administrator

Network Administrator – Fortinet, Zscaler, Cisco & AWS Cloud Networking

Location: Irving, TX (Accepting only local candidates to D/FW)

Position Type: Full-Time | Direct Hire **Sponsorship not available**

Experience Level: Mid-to-Senior Level | 5 Years of Network Administration Experience

Industry: Global Enterprise IT | Network Infrastructure | Cloud Networking

Technology Stack: Fortinet | FortiGate | Zscaler | Cisco | AWS | Azure | Firewalls | VPN | LAN/WAN

Position Overview

CornerStone Technology Talent Services (TTS) is seeking an experienced Network Administrator for a full-time, direct-hire opportunity with a global organization in Irving, Texas.

The ideal candidate will bring 5 years of hands-on network administration experience, including strong expertise in Fortinet/FortiGate, Zscaler, Cisco networking, and AWS cloud networking.

This position will play an important role in supporting and modernizing enterprise network infrastructure as the organization transitions toward Fortinet and Zscaler technologies while maintaining its existing Cisco-based global network.

We are seeking a technically strong individual contributor who enjoys hands-on network administration, troubleshooting, infrastructure deployments, and supporting complex hybrid cloud environments.

Key Responsibilities

Enterprise Network Administration

• Configure, deploy, maintain, and troubleshoot enterprise LAN/WAN infrastructure across multiple locations.
• Support Cisco routing, switching, and network connectivity within a global enterprise environment.
• Monitor network availability, performance, security, and operational stability.
• Diagnose and resolve network connectivity, latency, routing, and performance issues.
• Support network infrastructure upgrades, migrations, and technology deployments.

Firewall & Network Security

• Administer and troubleshoot Fortinet/FortiGate firewalls and Zscaler security solutions.
• Configure and maintain firewall rules, access control lists (ACLs), security policies, and network access controls.
• Support the transition from legacy Palo Alto infrastructure to Fortinet and Zscaler technologies.
• Troubleshoot VPN connectivity, firewall configurations, routing policies, and network security issues.
• Assist with firewall deployments, policy changes, and network security improvements.

AWS & Hybrid Cloud Networking

• Configure, administer, and troubleshoot AWS networking environments.
• Manage AWS Virtual Private Clouds (VPCs), subnets, routing tables, gateways, load balancers, and cloud firewall controls.
• Troubleshoot connectivity between AWS, Azure, and on-premises network infrastructure.
• Support secure hybrid cloud connectivity, including VPNs, network gateways, and routing configurations.
• Diagnose cloud networking issues involving security groups, network ACLs, routing, and access policies.
• Collaborate with infrastructure, cloud, and security teams to maintain reliable and secure connectivity across environments.

Required Qualifications

• 5 years of professional, hands-on network administration experience supporting enterprise network infrastructure.
• 3–5 years of practical AWS networking experience, including VPCs, gateways, routing, load balancing, and network security.
• Strong experience administering and troubleshooting Fortinet/FortiGate firewalls.
• Experience with Zscaler networking or security solutions.
• Hands-on experience supporting Cisco enterprise networking, including routing and switching.
• Strong understanding of TCP/IP, DNS, DHCP, VLANs, VPNs, LAN/WAN, and network routing protocols.
• Experience configuring and maintaining firewall policies, ACLs, and network security rules.
• Ability to troubleshoot connectivity across cloud and on-premises environments.
• Experience with network monitoring, incident resolution, and infrastructure deployments.
• Strong analytical, troubleshooting, communication, and documentation skills.

Preferred Qualifications

• Experience with Azure networking, including virtual networks, VPN gateways, and hybrid connectivity.
• Experience supporting geographically distributed or global enterprise networks.
• Previous involvement in firewall migrations or network security technology transitions.
• Familiarity with Palo Alto firewalls, particularly in migration or replacement scenarios.
• Experience working with cloud and infrastructure engineering teams.
• Relevant certifications such as CCNA, Fortinet, AWS, or Azure networking certifications are beneficial but not required.

This is a full-time, direct-hire individual contributor opportunity based in Irving, TX, focused on technical execution, operational support, and maintaining secure, reliable enterprise network infrastructure.