Senior Network Engineer

Agil3 Technology Solutions (A3T) is seeking an experienced Senior Network Engineer to provide enterprise network engineering, administration, sustainment, and Tier III technical support for the U.S. Government IT environment. The Senior Network Engineer will be responsible for designing, configuring, maintaining, monitoring, securing, documenting, and troubleshooting enterprise network infrastructure supporting customer operations. The position supports geographically dispersed locations and works closely with Systems Engineering, Systems Administration, Cloud Engineering, Cybersecurity, and Technical Support personnel.

• Engineer, configure, administer, maintain, monitor, and troubleshoot enterprise LAN, WAN, and wireless network infrastructure.
• Configure and maintain Cisco network equipment and associated network-management technologies.
• Manage and troubleshoot switches, routers, wireless infrastructure, network interfaces, VLANs, IP addressing, and related network services.
• Support Internet Protocol Address Management (IPAM) and maintain accurate IP address and VLAN assignments.
• Configure and maintain network access and connectivity supporting users, servers, applications, cloud services, and enterprise systems.
• Support and troubleshoot DISA and commercial telecommunications circuits, including coordination with external service providers when necessary.
• Open, manage, track, and resolve technical support cases with Cisco TAC and other network-equipment vendors.
• Diagnose complex network outages, degraded performance, packet loss, connectivity failures, routing problems, wireless issues, and other infrastructure incidents.
• Monitor network availability, utilization, capacity, performance, and security and proactively identify potential service degradation.
• Perform advanced root-cause analysis of network and infrastructure incidents and recommend corrective actions.
• Install and implement network device software, firmware, patches, and security updates in accordance with applicable cybersecurity directives.
• Support applicable IAVA/IAVB/IAVM, STIG, vulnerability-remediation, and cybersecurity-hardening activities affecting network infrastructure.
• Coordinate with Cybersecurity personnel to remediate vulnerabilities and maintain secure network configurations.
• Maintain configuration baselines and participate in formal configuration- and change-management processes.
• Maintain current network diagrams, architecture documentation, equipment configurations, circuit information, SOPs, troubleshooting procedures, and other technical documentation.
• Develop and maintain Standard Operating Procedures (SOPs) and After Action Reports (AARs) for significant outages, maintenance activities, upgrades, and network incidents.
• Identify network equipment approaching End-of-Life (EOL) or End-of-Support (EOS) and provide recommendations for technology refresh and replacement.
• Support network equipment replacement and Return Material Authorization (RMA) activities.
• Support network modernization, upgrades, migrations, installations, and technology-refresh initiatives.
• Coordinate with Cable/Infrastructure Technicians concerning premise wiring, patch panels, network closets, fiber/copper connections, and physical connectivity issues.
• Work with Systems Engineers and Systems Administrators to troubleshoot network-dependent services and application connectivity.
• Coordinate with Cloud Engineers concerning connectivity between on-premises environments and Microsoft Azure/cloud resources.
• Provide Tier III escalation support for complex network problems escalated by Systems Administrators and Technical Support personnel.
• Provide technical guidance and mentoring to network, systems, and support personnel.

• Must have 8+ years of progressively responsible network administration, network engineering, or enterprise infrastructure experience.
• Must have an active DoD Secret security clearance.
• Must have a Cisco Certified Network Professional (CCNP) certification.
• Must meet applicable DoD 8140/DCWF requirements for Work Role 441 at the Advanced proficiency level.
• Demonstrated experience supporting complex enterprise LAN/WAN environments.
• Advanced experience configuring and troubleshooting Cisco routing and switching technologies.
• Experience supporting enterprise wireless network infrastructure.
• Strong understanding of TCP/IP, routing, switching, VLANs, subnetting, DNS, DHCP, SNMP, VPNs, and network-access technologies.
• Experience with network monitoring,…