Mobile Core Network Ops Engineer (4G/5G)

Role: Mobile Core Network Ops Engineer (4G/5G) Location: Singapore We are partnering with a leading organisation to hire a Mobile Core Network Ops Engineer (4G/5G) to support critical telecom infrastructure and ensure seamless network operations.

About the Role

You will be responsible for the operation, maintenance, and troubleshooting of 4G/5G core network systems, ensuring high service availability and performance, including support for international roaming services.

Key Responsibilities

• Manage and support 4G/5G Mobile Core nodes (e.g., IMS, HSS, UDM, SBC, MSS, etc.) to ensure smooth network operations Perform system maintenance, including patching, upgrades, and performance optimisation Monitor network performance, KPIs, and alarms to maintain service quality Troubleshoot and resolve end-to-end network issues across core systems Collaborate with local providers and international roaming partners for testing and service assurance Implement security hardening and vulnerability management to mitigate risks Develop and maintain operational processes and documentation

Requirements

• Degree in Electronics, Communications, Networking, or related field Minimum 3-5 years of experience in the Telco industry Strong knowledge of 4G/5G core networks and call flows Familiarity with protocols such as IMS, VoLTE, SS7, Diameter, SIP, SCTP Hands-on experience in network troubleshooting (end-to-end) Exposure to VoLTE roaming and IREG testing Understanding of network and application security Knowledge of IP networking (switching & routing) Experience working with Linux and virtualised environments Basic scripting/programming skills (e.g., Python, Shell)