Core Network Engineer (5G / 4G)

About the role

This position covers the installation, commissioning and maintenance of core network elements such as 5GC, 4G EPC, IMS and CS. It involves supporting network planning, upgrades and cut-over, coordinating integration with wireless, transport and transmission domains, and training local operation and maintenance teams.

Key responsibilities

• Install, commission and integrate Core Network elements (5GC / 4G EPC / IMS / CS) to ensure a smooth network go-live.
• Perform routine maintenance, patrols and fault handling, quickly identifying and resolving anomalies to keep the network stable.
• Support network planning, capacity expansion, upgrades and cut-over activities, preparing and executing technical solutions.
• Coordinate integration and joint commissioning between Core Network and wireless, transport and transmission domains, and optimise network KPIs.
• Work with local operator customers and R&D teams, collecting and escalating network issues and optimisation requests.
• Produce technical documents, operation manuals and maintenance reports, and train local O&M teams to strengthen local self-delivery.
• Comply with company quality and security standards and implement network security management requirements.

Required profile

• Bachelor's degree or above in Telecommunications, Electronic Engineering, Computer Science, Network Engineering or a related field.
• 1+ year of related experience in core network or telecommunications is preferred; outstanding fresh graduates are also welcome.
• Hands-on experience in core network delivery, integration or maintenance projects with operators or equipment vendors is preferred.
• Good spoken and written English, as it is the working language; local language proficiency is an advantage.

Required skills

• Solid understanding of LTE / 5G NSA/SA core network architecture and principles.
• Familiarity with 5GC (AMF/SMF/UPF/UDM/NRF) or EPC (MME/SGW/PGW), IMS and NFV cloud deployment is a plus.
• Knowledge of TCP/IP and signalling procedures (S1, NG, Diameter, SIP) with packet capture, signalling tracing and protocol analysis.
• Proficiency with core network management and operation tools, strong troubleshooting and log-analysis skills.
• Basic Linux and command-line skills; virtualisation and cloud fundamentals are a bonus.