Remote Senior Core Network Engineer: 5G/4G Ops Lead

Cirrus Core Networks, Inc.; United States; Remote; USD 140,000 - 230,000; Full time

Job summary

Cirrus Core Networks is seeking a Senior Core Network Engineer to act as the final escalation point for Sev-1 incidents and lead end-to-end core deployments. The role spans planning through handover, troubleshooting across 4G/5G, and coordinating with NOC and operations teams in a distributed environment.

The candidate will mentor NOC engineers, develop runbooks, and own performance tuning for production platforms, with a remote work option across the US and Europe and compensation aligned to

Qualifications

• 7+ years of hands-on mobile core operations or engineering in a production environment.
• Proven experience leading mobile core deployments or migrations in a production operator or managed services environment.
• Direct experience leading Sev-1 incident resolution and formal root cause analysis.
• Hands-on experience operating 4G EPC and IMS functions, including HSS, PCRF, DRA, and packet core.
• Working knowledge of legacy 2G/3G core networks (HLR, MSC/VLR, SGSN/GGSN, SS7/MAP) and troubleshooting across network generations.
• Strong troubleshooting across Diameter, GTP, SIP, and SS7/SIGTRAN, including protocol trace analysis.
• Experience operating virtualized or containerized network functions.

Responsibilities

• Serve as final technical escalation point for Sev-1 and critical outages across the technology scope above.
• Lead root cause analysis and drive corrective actions to closure.
• Troubleshoot complex multi-vendor, multi-protocol issues, including cross-generation interworking and roaming failures.
• Lead core network deployments end to end, including planning, implementation, testing, cutover, and handover to operations, in line with approved architecture.
• Coordinate vendors, internal teams, and customer technical contacts throughout deployment.
• Lead platform migrations and cutovers.
• Own performance tuning and capacity monitoring for production platforms.
• Produce low-level designs and implementation plans.
• Plan and run vendor solution validation and acceptance testing, in coordination with the Senior Core Network Architect and Product Management.
• Manage technical escalations with vendors through to resolution.
• Mentor NOC engineers and raise escalation capability across CCN’s distributed operations teams.
• Develop and maintain troubleshooting runbooks and operational documentation.

Skills

7+ years core mobile/packet core

Lead multi-vendor deployments

Incident management

Troubleshooting across Diameter/GTP/SI

Virtualized/network functions

Tools

5G SA core

IMS/VoLTE/VoWiFi

ePDG roaming

Job description

Cirrus Core Networks is seeking a Senior Core Network Engineer to act as the final escalation point for Sev-1 incidents and lead end-to-end core deployments. The role spans planning through handover, troubleshooting across 4G/5G, and coordinating with NOC and operations teams in a distributed environment.

The candidate will mentor NOC engineers, develop runbooks, and own performance tuning for production platforms, with a remote work option across the US and Europe and compensation aligned to