4G\/5G Core Network Engineer

SAN R&D Business Solutions is seeking a highly skilled 4G/5G Core Network Expert with strong experience in telecom APIs and network function integration. The ideal candidate will work closely with telecom vendors and internal teams to enable API-driven integration across 5G core network functions, aligned with industry standards.

Responsibilities:

• Work with 4G/5G core network products from vendors like Nokia, Ericsson, and Samsung
• Analyze and interpret 3GPP specifications and telecom standards
• Design and implement API integrations across network functions (NFs)
• Work with REST APIs (OpenAPI/Swagger) for telecom integrations
• Enable integration of LF CAMARA APIs with network functions such as: NEF / SCEF, PCF (Policy Control Function), UDR (Unified Data Repository)
• Collaborate with vendors to identify gaps and define API roadmaps
• Support implementation of GSMA Open Gateway architectures
• Understand and contribute to call flows and connection flows across: IMS (IP Multimedia Subsystem), SBA (Service-Based Architecture), OSS/BSS systems (TM Forum standards)
• Provide technical guidance on API exposure and network capabilities

Requirements:

• Strong experience in 4G/5G Core Network architecture
• Hands-on experience with telecom vendors: Nokia / Ericsson / Samsung
• Strong understanding of: 3GPP standards (5G core, NEF, SCEF, etc.)
• Strong understanding of: LF CAMARA APIs
• Strong understanding of: GSMA Open Gateway architecture
• Experience with REST APIs (OpenAPI / Swagger)
• Knowledge of network function interfaces and integrations
• Understanding of IMS, SBA, OSS/BSS call flows
• Experience working with API exposure layers in telecom
• Familiarity with TM Forum frameworks
• Experience working with vendor roadmap alignment and integration gaps
• Strong analytical skills to interpret technical specifications