Core Engineer

Bucharest, Romania💼 Full-time🗓 2026-10-01 → 2026-10-07

Core

Troubleshoot real network issues across 3G, 4G, and 5G Standalone, own tickets end-to-end, and lead integrations on a live production mobile core infrastructure.

Role type

Senior IC Core Network Engineer

Builds

Live mobile core infrastructure for global roaming and MVNO operations

Domain

Telecommunications / Mobile Core Networking

Required skills

MNO/MVNO architecture, 3GPP standards (2G/3G/4G/5G), GTP-C/U, CUPS, Diameter, Radius, 5G-SA architecture (AMF/SMF/UPF/NRF/PCF), GRX routing, IPX interconnect, roaming procedures (IR.21), PGW configuration, PCRF policy management, GTP Proxy, monitoring tools, Python scripting

Preferred skills

API design, network element integration, incident management under pressure

Technologies

3GPP, GTP, Diameter, Radius, 5G-SA, GRX, IPX, Python

Responsibilities

Troubleshoot live network incidents across 3G/4G/5G, manage end-to-end ticket ownership, lead network element integrations, perform configuration and session management on PGW/PCRF/GTP Proxy, analyze signaling flows (Diameter/Radius), work 24x7 on-call duty (via careerplan.io/jobs/46-00E-F5-D6D-core-engineer)

Seniority

Senior, hands-on IC