Position Overview MetroSys is seeking a Senior Network Infrastructure Engineer based in the Greater Phoenix area to support a complex enterprise network environment. This position is hands-on and onsite, with responsibility for network operations, security, troubleshooting, infrastructure improvements, and project delivery. The ideal candidate has strong experience with Cisco networking, Palo Alto firewalls, VMware NSX, SD-WAN, and enterprise data center networking and is comfortable supporting highly available and regulated environments. Key Responsibilities • Support and maintain enterprise LAN, WAN, data center, wireless, VPN, and SD-WAN environments. • Configure and troubleshoot Cisco routers and switches and Palo Alto Networks firewalls. • Administer firewall policies, NAT, VPN connectivity, network segmentation, and security controls. • Support VMware NSX and software-defined networking environments. • Troubleshoot complex routing, switching, connectivity, firewall, and performance issues. • Support multi-site WAN connectivity, branch offices, third-party connections, and carrier services. • Participate in infrastructure upgrades, network refreshes, disaster recovery testing, and change activities. • Monitor network availability, security, and performance and recommend improvements. • Maintain network diagrams, configurations, operational documentation, and standards. • Collaborate with local Phoenix-based infrastructure teams as well as cloud, security, systems, and application teams. • Participate in after-hours maintenance and on-call activities as needed. Required Qualifications • Must currently reside in the Greater Phoenix, AZ metropolitan area. • 5+ years of enterprise network engineering experience. • Strong hands-on experience with: • Cisco routing and switching • Palo Alto Networks firewalls • VMware NSX • Enterprise WAN and SD-WAN • Strong knowledge of BGP, OSPF, VLANs, VPNs, NAT, and high-availability networking. • Experience with Palo Alto Panorama. • Experience supporting enterprise data center environments. • Strong troubleshooting and communication skills. • Ability to work onsite in the Phoenix area on a regular basis. Preferred Qualifications • Experience supporting financial services or other regulated environments. • Azure or AWS networking experience. • Familiarity with Python, PowerShell, Ansible, or network automation. • Cisco CCNP, Palo Alto, VMware, or similar certifications.