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)