Telecom Core & Signaling Engineer (SS7/Diameter/IMS)

Job Title: Telecom Core & Signaling Engineer (SS7/Diameter/IMS)

Industry: Telecoms

Job Type: Hybrid

Location: Lekki, Lagos

Experience: 5-7 years

Salary: NGN800k - NGN1.2m net/month

Our client in the Telecoms industry is seeking a highly experienced Telecom Core & Signaling Engineer (SS7/Diameter/IMS) to design, operate, and evolve the end-to-end MVNO core network, ensuring seamless interworking with multiple Mobile Network Operators (MNOs) and third-party service platforms.

This role requires deep, hands-on expertise in telecom core networks, signaling (SS7 / Diameter / SIP), voice and data services, and proven experience working within the MNO environments.

The successful candidate will be responsible for architecture, deployment, interconnectivity, troubleshooting, optimization, and regulatory compliance of the MVNO core infrastructure.

Key Responsibilities

Core Network Operations & Management

• Design, deploy, and maintain core network elements including HLR/HSS, MME, SGSN, GGSN, PGW, SGW, and IMS components
• Manage SIP-based voice services including VoLTE, VoWiFi, and traditional circuit-switched voice interconnection.
• Configure and optimize signaling interfaces (Diameter, SS7/SIGTRAN, SIP/IMS) between MVNO core and host MNO networks
• Implement and maintain roaming agreements and interconnect configurations with partner networks

Network Interworking & Integration

• Lead technical integration projects with host MNO networks, ensuring proper MAP, Diameter, and SIP protocol implementations
• Configure and troubleshoot IPX/GRX connections for international roaming and signaling
• Manage relationships with host MNOs on technical matters including interface specifications, capacity planning, and service enablement
• Coordinate with vendors and partners on core network equipment and service delivery

Technical Support & Troubleshooting

• Perform advanced troubleshooting of core network issues including call setup failures, registration problems, and data session issues
• Lead incident response for major network outages and service-affecting issues

Planning & Optimization

• Monitor network performance and capacity, recommending upgrades and optimizations
• Develop and maintain network architecture documentation and operational procedures

Required Qualifications

Experience

• Minimum 5-7 years of hands-on experience in mobile core networks with MNO or MVNO operators. Extensive experience with SS7, SIGTRAN, Diameter, and SIP protocols
• Proven track record of working with multiple core network vendors (e.g., Ericsson, Nokia, Huawei, Mavenir)
• Direct experience with MVNO architecture and host MNO integration

Technical Skills

• Expert knowledge of 2G/3G/4G core network architecture (MSC, HLR, SGSN, GGSN, MME, HSS, PGW, SGW)
• Deep understanding of IMS architecture and VoLTE/VoWiFi implementations
• Proficiency in signaling protocols: MAP, CAP, INAP, Diameter, SIP, MGCP, SIGTRAN
• Strong knowledge of routing protocols and IP networking (MPLS, BGP, OSPF)
• Experience with network monitoring and troubleshooting tools (Wireshark, protocol analyzers, element management systems)

Mindset

• A proactive problem-solver who can operate in a fast-paced, "startup-style" MVNO environment while maintaining "telco-grade" reliability.

Education

• Bachelor's degree in related field or equivalent practical experience
• Relevant certifications (general or vendor-specific certifications) are highly valued

Personal Attributes

• Strong analytical and problem-solving abilities with attention to detail
• Excellent communication skills for technical discussions with MNO partners and vendors
• Ability to work independently and manage multiple priorities
• Team player with collaborative approach to network operations
• Adaptable to rapidly changing technology and business requirements

Qualified candidates ONLY can send their CVs to talent@hr-aidconsults.com using the job title as the subject of the mail.

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