Senior Network Security Engineer

GovCIO is seeking a Senior Network & Security Engineer to lead the design, operation, troubleshooting, and continuous improvement of enterprise network-security infrastructure. The role manages Palo Alto Networks firewalls, Panorama, high-availability environments, Cisco networking, network segmentation, Cortex XSIAM, and Strata Logging Service while serving as a technical escalation point and mentoring engineering teams.

Responsibilities:

• Lead the design, deployment, administration, and lifecycle management of Palo Alto Networks NGFW environments running PAN-OS
• Own centralized firewall management through Palo Alto Panorama, including device groups, templates, template stacks, policy inheritance, upgrades, configuration backups, log monitoring, and firewall onboarding
• Design and govern security policies using zero-trust, least-privilege, application-aware, and risk-based principles
• Configure and troubleshoot security zones, NAT, virtual routers, static and dynamic routing, IPsec VPN, GlobalProtect, decryption, URL Filtering, Threat Prevention, WildFire, DNS Security, and App-ID policies
• Lead enterprise network-segmentation and microsegmentation initiatives using security zones, VLANs, subinterfaces, virtual routers, routing controls, and application-based security policies
• Develop secure controls for traffic between users, servers, applications, management networks, guest networks, IoT/OT devices, data-center workloads, and cloud resources
• Architect, configure, test, and troubleshoot Palo Alto High Availability deployments, including Active/Passive and Active/Active designs as required
• Resolve complex HA failures involving HA1 control links, HA2 session/state synchronization, HA3 packet forwarding, peer communications, configuration synchronization, monitoring failures, split-brain prevention, and failover recovery
• Plan and execute HA failover testing, PAN-OS upgrades, disaster-recovery exercises, and maintenance procedures while minimizing service impact
• Troubleshoot HA infrastructure dependencies, including cables, transceivers, switch ports, port channels, VLANs, routing, MTU, latency, packet loss, and redundant-path failures
• Lead the configuration, support, and troubleshooting of Cisco Catalyst and Nexus switching environments
• Design and support VLANs, trunking, STP/RSTP/MST, EtherChannel/port channels, HSRP/VRRP, Layer 2/Layer 3 switching, ACLs, QoS, switch security, routing, and access-control technologies
• Diagnoses complex connectivity and performance issues through firewall logs, session inspection, packet captures, CLI diagnostics, switch counters, flow data, and network-monitoring platforms
• Analyze TCP/IP behavior, including handshake failures, SYN/SYN-ACK/ACK flow, retransmissions, resets, timeouts, asymmetric routing, MTU/MSS issues, fragmentation, latency, packet loss, and NAT translation problems
• Verify packet flow across firewall policy, App-ID, routing, NAT, decryption, threat prevention, VPN, switching, and server/application layers
• Monitor firewall management-plane and dataplane health, including CPU, memory, session capacity, packet buffers, throughput, logging, and interface performance
• Integrate Palo Alto NGFWs and Panorama with Strata Logging Service and Cortex XSIAM
• Ensure reliable firewall log forwarding, cloud logging, log ingestion, data normalization, event availability, retention, and telemetry quality
• Use Cortex XSIAM and XQL Search to investigate, correlate, and respond to firewall, endpoint, identity, cloud, and third-party security events
• Partner with SOC teams to tune detections, investigate alerts, develop response procedures, improve visibility, and support incident containment and remediation
• Lead root-cause analyses for major network or security incidents and deliver corrective and preventive action plans
• Develop and maintain network diagrams, firewall-policy documentation, HA designs, runbooks, change plans, architecture standards, and operational procedures
• Mentor junior engineers and provide technical leadership during projects, production incidents, and security reviews

Requirements:

• Bachelor's degree with 8+ years (or commensurate experience)
• 7+ years of progressive experience in network engineering, network security, firewall administration, or security infrastructure operations
• 5+ years of hands-on Palo Alto Networks firewall experience in a production enterprise environment
• Advanced operational experience with Palo Alto Panorama, including multi-device policy management, templates, device groups, upgrades, configuration management, and troubleshooting
• Strong hands-on experience designing, maintaining, and troubleshooting Palo Alto High Availability environments
• Advanced understanding of HA1, HA2, HA3, configuration synchronization, session synchronization, failover behavior, link monitoring, path monitoring, peer health, and recovery processes
• Strong expertise in TCP/IP, IPv4/IPv6, DNS, DHCP, ARP, routing, NAT, VPNs, and packet-level troubleshooting
• Demonstrated ability to investigate TCP handshakes, resets, retransmissions, MTU/MSS issues, asymmetric routing, connection timeouts, and firewall session behavior
• Extensive experience with Cisco Catalyst and/or Nexus switching technologies
• Strong knowledge of enterprise switching and routing, including VLANs, trunking, STP/RSTP/MST, EtherChannel, HSRP/VRRP, routing protocols, ACLs, QoS, and switch-security controls
• Proven experience designing or implementing network segmentation and microsegmentation solutions
• Working knowledge of Cortex XSIAM, Strata Logging Service, security-event correlation, alert investigation, XQL Search, and firewall log ingestion
• Ability to lead technical design discussions, independently manage complex workstreams, and communicate risks and recommendations to technical and nontechnical stakeholders
• Strong documentation, change-management, incident-management, and root-cause-analysis skills
• Clearance Required: Must be able to attain and maintain AOUSC Public Trust
• Master's degree in Cybersecurity, Information Technology, Computer Science, Engineering, or a related field preferred
• Palo Alto Networks certifications: PCNSA, PCNSE, PCCSE, or equivalent enterprise-level experience
• Cisco certifications: CCNP Enterprise, CCNP Security, CCIE Enterprise Infrastructure, CCIE Security, or comparable expertise
• Experience with Palo Alto Prisma Access, Prisma Cloud, Cortex XDR, Cortex XSOAR, or cloud-delivered security services
• Experience with Cortex XSIAM alert triage, XQL queries, data-source integrations, detection tuning, dashboards, reporting, and response automation
• Experience with Cisco ISE, Cisco ACI, SD-Access, or enterprise network-access-control solutions
• Familiarity with Fortinet Security Fabric, FortiGate, FortiManager, and FortiAnalyzer
• Experience with AWS, Azure, Google Cloud Platform, hybrid-cloud network design, and cloud-security controls
• Familiarity with SIEM, SOAR, EDR/XDR, vulnerability-management, NDR, network-monitoring, and ticketing platforms
• Automation skills using Python, Ansible, Terraform, REST APIs, or related infrastructure-as-code and orchestration tools
• Experience supporting 24x7 environments, participating in an on-call rotation, leading critical incidents, and executing emergency changes