Job Description
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)