Core Network Engineer

Arpu Telecommunication Services

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We are seeking a Core Network Engineer who combines hands-on experience operating telecom core network elements with the ability to integrate, source, and expose network data and capabilities via APIs.You will be instrumental in supporting our platform, which enables telecom operators to provide network APIs (e.g., number verification, quality-on-demand, device status) to external developers and aggregators.This role requires a solid understanding of 4G and 5G Core Network architecture, subscriber management systems, and policy/control plane nodes, along with familiarity in interfacing these systems through standard protocols and data exposure frameworks.Core Network Expertise & Data Sourcing

Act as the technical SME for the following network elements:

Subscriber & Identity Systems: HSS, HLR, UDM, AUSF, EIR
Policy Control & Routing: PCF, PCRF, DRA
Packet Core: PGW, GGSN, UPF
Security & NAT: CGNAT
Understand how these nodes store and process subscriber session data, identity, and policies.
Work with operator teams to define which data and services can be securely exposed via APIs.

API Integration & Enablement

Design integration workflows to source information from network elements via:

Diameter / HTTP/2 / RESTful interfaces
3GPP standardized APIs
Custom vendor APIs or connectors
Support implementation of API exposure layers (e.g., CAMARA APIs) and facilitate compliance with GSMA Open Gateway standards.

Data Mapping & Specification

Map internal data structures to external API schemas (e.g., user location, device status, QoS parameters).
Define technical specifications for API contracts and ensure data integrity and privacy.

Testing & Validation

Validate integration workflows end-to-end, including:

Querying test data from core network elements
Verifying correct API responses
Handling error scenarios
Collaborate with development and QA teams to build robust test coverage.

Documentation & Knowledge Transfer

Document procedures for sourcing and exposing network data.
Train internal and external stakeholders on:

How APIs interact with core network systems

How to troubleshoot connectivity and data flow issues.Requirements

Bachelor’s degree in Telecommunications, Computer Engineering, or equivalent.
5+ years of experience working with telecom core network elements.
Hands-on experience integrating with vendor systems (Ericsson, Nokia, Huawei, Cisco) preferred.
Experience in projects involving API enablement or network function exposure is highly desirable.
Core Network Expertise:

In-depth understanding of:

HSS, HLR, UDM, AUSF, EIR for identity and authentication
PCRF, PCF, DRA for policy control
PGW, GGSN, UPF for data plane functions
CGNAT and session management
Familiarity with 4G EPC and 5G Core (SBA) architecture
Integration & APIs:

Knowledge of:

3GPP standards for Service Exposure Functions (SEF)
RESTful API principles
Diameter and HTTP/2 interfaces
OAuth2 and API security models
Exposure to CAMARA / GSMA Open Gateway concepts is a strong plus.
Tools & Scripting:

Ability to create prototypes and test queries (Postman, Swagger, custom scripts)
Comfortable with basic scripting in Python or Bash
Soft Skills:

Strong cross-functional communication (network teams, developers, product)
Analytical mindset and structured problem-solving

Arpu Telecommunication Services