Network Performance Engineer with Security Clearance

Agensys is seeking an experienced Network Performance Engineer with deep expertise in Netscout technologies to join its Denver-based infrastructure team. This role is critical to maintaining the health and performance of the enterprise network while designing and implementing advanced dashboards that provide real-time visibility into network performance. Key Responsibilities: * Monitor, support, and troubleshoot enterprise network infrastructure using Netscout nGeniusONE and InfiniStream * Serve as the Netscout SME, providing Tier 2/3 support for network performance incidents * Identify and resolve network anomalies, packet loss, latency, and application performance issues * Partner with NOC, network engineering, and application teams to perform root cause analysis * Maintain and optimize Netscout probe and appliance deployments * Support change management and validate network changes with performance analysis * Design and maintain real-time performance dashboards * Develop custom reports, alerts, and visualizations to proactively identify trends and capacity concerns * Participate in capacity planning, documentation, and on-call support activities Required Qualifications: * 3+ years of hands-on Netscout experience (nGeniusONE, InfiniStream, nGenius Pulse, or ASI) * Strong knowledge of TCP/IP, BGP, OSPF, MPLS, QoS, and VLANs * Experience with packet capture analysis and deep packet inspection (DPI) * Ability to design and implement network performance dashboards * Experience troubleshooting Layer 2-7 issues in large enterprise or service provider environments * Knowledge of SNMP, NetFlow/IPFIX, and syslog integrations * Strong communication and analytical skills Nice to Have: * Cable, telecom, or ISP/MSO experience * SolarWinds, ThousandEyes, Grafana, or AppDynamics * Python, Ansible, or Bash scripting * Cisco CCNP / CCIE * SD-WAN, AWS/Azure networking, or hybrid cloud experience * ServiceNow and ITIL familiarity