Mobile Core Engineer (Subscriber Data Management & Signaling)

TL;DR

Mobile Core Engineer (Subscriber Data Management & Signaling): Responsible for subscriber data systems across legacy and 5G, ensuring consistent and correct behavior during authentication, provisioning, and mobility with an accent on mobile core architecture, signaling routing, and subscriber lifecycle management. Focus on solving complex data consistency challenges across multi-IMSI/multi-SIM environments and maintaining high availability through monitoring, incident troubleshooting, and automation initiatives.

Location: Oslo, Norway

Company

hirify.global is a mobile operator providing IoT connectivity services with its own mobile core network and supporting systems.

What you will do

• Design, operate, and maintain subscriber systems (HLR/HSS/UDM/UDR and policy control/charging systems) across legacy and 5G.
• Ensure correct authentication, provisioning, and mobility behavior, including data consistency for multi-IMSI/multi-SIM environments.
• Develop and maintain signaling routing on STPs/DRAs/SCP/SEPP and support NRF/NSSF for 5G SA.
• Support subscriber provisioning and lifecycle management, and integrate with adjacent mobile core network functions.
• Monitor platform performance, ensure high availability, and participate in on-call rotation to troubleshoot incidents and drive post-mortems.
• Collaborate with vendors on onboarding new network functions and feature requirements specification; support automation initiatives for operational efficiency.

Requirements

• Competence or experience with mobile core network architecture and relevant standards (3GPP releases, GSMA, IETF).
• Experience with mobile network functions across 4G EPC and 5G SA/NSA.
• Hands-on familiarity with subscriber systems and signaling protocols such as SIGTRAN, Diameter, Radius, and HTTP.
• Ability to work independently and proactively, and to communicate effectively in a technical environment.
• Experience operating and maintaining telecom platforms with monitoring and incident resolution (including on-call rotation).
• Basic scripting or database querying (SQL).

Culture & Benefits

• Hybrid working approach (#LI-Hybrid), with flexibility for home office.
• State-of-the-art premises in the tech hub at Løren/Hasle-Linje.
• Flexible, growth-oriented entrepreneurial culture with a strong emphasis on collaboration.
• Competitive terms and security in employment.
• Regular events and celebration of successes, including company trips.

Hiring process

• Recruitment process includes details on how hybrid working applies to this role.
• Interviews will assess technical fit across subscriber data management, signaling, and mobile core operations.