Core Network Integration Engineer

Key Responsibilities

Integration and Deployment

• Lead configuration, commissioning, and integration of core network elements into bare-metal, virtualized (NFV), and cloud-native telecom environments.

Execution and Testing

• Develop, review, and execute detailed Methods of Procedure (MOP) for software upgrades, expansion, and service migrations.
• Perform pre-checks, post-checks, and end-to-end service validation.

Technical Documentation

• Create and maintain technical delivery documentation, including High-Level Designs (HLD), Low-Level Designs (LLD), and Customer Information Questionnaires (CIQ).

Troubleshooting and Optimization

• Identify and resolve complex configuration and protocol-level faults during integration and stabilization.

Cross-Functional Collaboration

• Work with System Architects, Project Managers, and Operations/Care teams to ensure smooth operational handovers.

Open Technology Tracks

• Candidates must have expertise in at least one of the following tracks

IP Multimedia Subsystem (IMS)

• Deep integration and optimization expertise in Nokia IMS Core nodes, including CFX-5000/CSCF, HSS, BG-CF, OpenTAS, and MRF.
• Advanced understanding of VoLTE, VoWiFi, and VoNR call flows.
• Strong knowledge of SIP, SDP, RTP, RTCP, and Diameter signaling protocols.

Packet Core (4G EPC / 5G Core)

• Experience deploying and integrating Nokia Cloud Packet Core (CPC) elements, including CMG (Cloud Mobility Manager) and CMM (Cloud Mobility Gateway), for EPC and 5G Core functions such as AMF, SMF, UPF, and PCF.
• Understanding of GTPv2, GTP-U, HTTP/2 (SBI), and Diameter.
• Knowledge of network slicing, Quality of Service (QoS), and user-plane forwarding optimization.

Subscriber Data Management (SDM)

• Hands-on installation, deployment, and schema configuration of Nokia One-NDS (One Network Directory Server) and SDL (Shared Data Layer).
• Experience managing subscriber data elements, including HLR, HSS, UDM, AUSF, and EIR.
• Proficiency in LDAP/DSA directory structures, database replication topologies, and large-scale data migration scripts.

Charging and Business Support Systems (BSS)

• Experience deploying and integrating convergent charging platforms.
• Technical knowledge of CHF (Charging Function) and CCS (Convergent Charging System) architectures in 5G standalone networks.
• Expertise in online and offline charging protocols, including Diameter interfaces (Gy, Gz, Ro, and Rf) and HTTP/2 Service-Based Interfaces (Nchf).
• Understanding of rating engines, tariff configuration, balance management, and integration with billing, mediation, and CRM systems.

Required Technical Skills and Qualifications

• Education: Bachelor's degree in Telecommunications, Electronic Engineering, Computer Science, or a related field.
• Experience: 3+ years of technical experience in telecom core network delivery or integration. Hands-on Nokia Cloud Core product delivery experience is a major advantage.
• Cloud and Virtualization: Experience with Nokia CloudBand Application Manager (CBAM), OpenStack, Kubernetes, VMware, and NFV frameworks.
• Networking: Strong knowledge of IP networking, routing/switching protocols such as OSPF and BGP, and security frameworks.
• Diagnostic Tools: Experience with Wireshark for analyzing hexadecimal traces and complex system logs.
• Automation: Familiarity with Python, Bash, and Ansible for automated deployment and testing.