Core Network Engineer (5G)

Responsible for the design, deployment, operation, and optimization of 5G core network platforms. Focused on hands-on engineering execution, supporting both internal network operations and contracted wholesale customer deployments across U.S. and international environments. Innovation is delivered through practical improvements in automation, reliability, observability, and deployment efficiency rather than strategic product ownership., * Core Network Design, Deployment and Management

• Design, deploy, operate, and maintain 5G Core Network (5GC) components including AMF, SMF, UPF, NRF, PCF, AUSF, and UDM across both SA and NSA deployments.
• Deploy, manage and operate 5G core environments in high-availability and geo-redundant configurations, ensuring resilience, scalability, and service continuity.
• Support inter-PLMN connectivity including roaming, SEPP, and secure interconnect architectures.
• Support mediation requirements for billing / charging and performance statistics on 5G core platform.
• Perform end-to-end call-flow debugging and protocol-level troubleshooting across N1, N2, N3, N4, N6, N10, N11, and N12 interfaces.
• Implement and support network slicing, policy control, and service function chaining.
• Ensure compliance with relevant 3GPP specifications, security requirements, and interface protocols (e.g. HTTP/2, PFCP, SCTP).
• Collaborate with RAN and infrastructure teams to support lab test-cells, and limited production radio deployments where required.
• Integrate, harden, and operate both vendor-supplied and open-source 5G core solutions (e.g. Open5GS, free5GC, Magma) in test, pre-production, and production environments.
• Contribute fixes, enhancements, and operational tooling where appropriate to support production stability and maintainability.
• Use automation to reduce mean time to repair (MTTR), improve deployment repeatability, and increase operational visibility.
• Develop and maintain custom scripts and tooling (e.g. Python, Bash, Go) to automate deployment, configuration, testing, monitoring, and fault analysis.

• Bachelor’s or Master’s degree in computer science or engineering.
• Minimum of 5-8 years working in the telecommunications industry designing, integrating and managing mobile core network propositions for e.g. a Network Equipment Provider or carrier / Mobile Network Operator (MNO).
• Deep understanding of 5G Core architecture (SA/NSA), 3GPP specs, and control/user plane functions.
• Experience with open-source 5G cores like Open5GS, free5GC, or Magma.
• Experience with Mongo database for opensource 5G solutions is a plus.
• Programming in at least one of the C++, Python, Golang, Bash, or equivalent languages.
• Familiarity with containerization (Docker, Kubernetes), Git, and CI/CD tools.
• Hands-on experience with Wireshark, PCAP analysis, and log-level debugging.
• Minimum of five years of systems integration, management and/or technical support of 4G / LTE and 5G mobile core network components.
• In-depth knowledge of mobile voice and data core network architecture (including MNO and MVNO / MVNE infrastructure architecture) as well as network topology, including ability to describe the key elements of a mobile network and understand how the components function and interact as well as how mobile calls are made and received and how mobile data sessions work both in VoLTE and VoNR environments.
• Understanding of Packet Switched network elements, interfaces and messaging for 4G / LTE networks, including IMS architectures and PCRF.
• Understanding of Voice SIP / RTP, ISUP and voice convergence technologies, including IMS (including VoLTE and VoWiFi).
• Understanding of RADIUS and Diameter for both signaling and charging scenarios.
• Experience of capacity management and dimensioning of mobile core elements.
• Familiarity with LI (Lawful Intercept), E911 and CALEA requirements.
• Familiarity with IMS and VoNR architecture.
• Demonstrated experience implementing and operationalizing technically robust mobile core network solutions aligned with customer, regulatory, and operational requirements., * telecommunications industry: 7 years (Required)
• 4G/LTE and 5G mobile core systems integration: 5 years (Required)