We are hiring experienced CS (Circuit Switched) Core Network Engineers to join a large-scale telecommunications project based in Egypt. This is an exciting opportunity to work on multi-generational core network deployments in a dynamic international environment.

About the Role

You will be responsible for the delivery, integration, commissioning, optimization, and troubleshooting of CS Core and IMS/SBC network elements on a live network. Working alongside cross-functional teams, you will ensure network stability, quality of service, and continuous improvement across 2G/3G/4G/5G domains.

Key Responsibilities

- Deploy, commission, configure, and optimize CS Core and IMS/SBC products (CGP, SPG, CSC, ATS, MRP, SBC, CCF)
- Operate and maintain CS Core elements including MSC, MGW, HSS, STP-DRA
- Perform signaling analysis and troubleshooting across SS7 (MTP3/SCCP), M3UA/M2UA, BICC, ISUP, SIP/SDP/Diameter protocols
- Handle call flows and mobility procedures: call, SMS, handover, location update, CSFB, SRVCC, eSRVCC, anchoring, and domain selection
- Configure and troubleshoot interconnection between CS/IMS and peripheral systems: DRA, EPC, 5GC, PCRF, HSS, IN
- Manage B-number analysis, routing, and Diameter routing via DRA
- Support VoLTE, VoNR, and SVC solution architecture
- Perform upgrade, capacity expansion, and patching activities on Cloud IMS nodes
- Design and review HLD network designs; support overlay networking schemes
- (L3/Senior) Lead complex fault resolution, emergency handling, and network design reviews; mentor junior engineers





Technical Requirements

Core Knowledge (All Levels)

- IMS/SBC products: CGP, SPG, CSC, ATS, MRP, SBC, CCF — architecture and principles
- CS Core products: MSC, MGW, HSS, STP-DRA — architecture and principles
- Protocols: MTP3/SCCP, M3UA/M2UA, BICC, ISUP, SIP/SDP, Diameter, TCAP/CAMEL/INAP, H.248/MGCP
- Mobile communication processes: call, SMS, handover, CSFB, SRVCC, eSRVCC, WIN
- Interconnection with DRA, EPC, 5GC, PCRF, HSS, IN — data configuration and troubleshooting
- Services: anchoring, domain selection, emergency call, QoS, roaming, xSRVCC
- B-number analysis, routing, flexible Diameter routing in DRA
- KPI degradation troubleshooting

What We Are Looking For

- 5–8 years (L2) or 8+ years (L3) of hands-on experience in CS Core / IMS / SBC environments
- Strong background in CS/IMS product stacks; multi-vendor experience (e.g. Ericsson, Nokia, Cisco) is a plus
- Experience working on international or cross-border telecom projects
- Strong analytical and troubleshooting skills; ability to deliver under pressure
- Good communication skills; able to produce technical reports and liaise with customer teams
- Willingness to be based in Egypt for the duration of the project

Why Apply
- Work on a high-profile core network project in the Middle East / Africa region
- Exposure to latest multi-generational core network technologies (2G/3G/4G/5G, Cloud IMS)
- Competitive compensation package for international assignment
- Career development in a fast-paced international environment

📌 CS Engineer-Core Network (Delhi)
🏢 Career International 科锐国际
📍 Delhi