Sr IT Systems Engineer - PUB SEC (WORKS FROM HOME, CO, US)

Lumen is the trusted network for the AI‑powered world, connecting people, data, and applications through our expansive fiber network and connected ecosystem. We enable secure, high‑performance connectivity across cloud, edge, and AI workloads for enterprises, governments, and communities. At Lumen, you’ll work on infrastructure customers rely on today and build for what’s next, where performance, security, and resilience matter. This is a high accountability environment where bold ideas drive real innovation for our customers, partners, and industry. The work is challenging, expectations are clear, and trust is built into how we operate. If you’re ready to take ownership, deliver meaningful impact, and help shape the future of AI‑ready connectivity, join us today. The Role The IT Systems Engineer II provides advanced Tier II support by troubleshooting and repairing network devices, tools, and services for a nationwide fiber optic transport network as well as network support for two (2) geographically separated Network Operation Centers (NOC). The IT System Engineer II is operationally responsible for all IP and network management applications associated with the IP and transport platforms and maintaining 100% availability of IP and Network Management services in engineering and operations environment. Requires a Top Secret/SCI clearance. The Main Responsibilities Serves as the Network Operations Center (NOC) primary point of contact (POC) for problem escalations, interacting with Network Provisioners or equipment vendors to identify and develop solution to escalated problems. Operates as network technical lead on internet protocol (IP) and network management (NM) activities and serve as the first level of escalation to Tier I NOC personnel on network issues. Troubleshoot, identify, and resolve logical and physical network issues and identify problem trends and systemic issues before Tier III elevation Each discipline focuses on resolving day-to-day incidents and ele