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

Cygnify

Remote

Who this role is best for

Aimed at senior telecom engineers with hands-on 4G/5G core network experience who thrive in operational troubleshooting roles.

Best fit for

Telecom professionals with deep expertise in 4G/5G core network troubleshooting.
— “Troubleshoot and resolve end-to-end network issues across core systems”
Engineers comfortable collaborating with international partners on roaming services.
— “Collaborate with local providers and international roaming partners”
Candidates who can balance technical operations with security hardening.
— “Implement security hardening and vulnerability management”

Things to consider

Requires maintaining high service availability for critical infrastructure.
— “ensuring high service availability and performance”
Involves system maintenance during non-standard hours.
— “Perform system maintenance, including patching, upgrades”

How to stand out

Document specific instances where you resolved complex roaming issues.
— “Exposure to VoLTE roaming and IREG testing”
Showcase automation scripts you've developed for network operations.
— “Basic scripting/programming skills (e.g., Python, Shell)”

Pace · Fast PacedCollaboration · MediumAutonomy · MediumDecision Impact · TeamLevel · Senior

Derived from job-description analysis by Serendipath's career intelligence engine.

What success looks like

High service availability and performance
End-to-end network issue resolution

Typical background

Degree in Electronics, Communications, Networking3-5 years of experience in the Telco industry

Skills & requirements

Required

4g/5g Core NetworksNetwork TroubleshootingLinuxIP NetworkingScripting/programming

Preferred

Volte RoamingIREG Testing

Stack & domain

4g/5g Core NetworksImsHssUdmSbcMssPatchingUpgradesPerformance OptimizationNetwork TroubleshootingVolte RoamingIreg TestingNetwork And Application SecurityIp NetworkingLinuxVirtualised EnvironmentsPythonShellTelecomNetwork Operations

About the role

This role involves managing and maintaining 4G/5G core network systems to ensure seamless operations and high service availability, making it ideal for someone with a strong technical background and hands-on experience in telecom networks.

Original posting from Cygnify via Ashby

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)

Source: Cygnify careers (Ashby)