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)