Senior Core Network Engineer (HLR/HSS & SDM)

New

EuropeFull-TimeSenior

Salary not disclosed

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Job Details

Requirements

Deep technical mastery of MAP (SS7) and Diameter (S6a/S13) protocols.
Extensive experience with HLR, HSS, and UDM (User Data Management) in a multi-tenant or MVNO/E environment.
Practical experience with Multi-IMSI applets and the logic required to manage roaming through Sponsor IMSIs.
Solid understanding of GSMA IREG (IR series); familiarity with TADIG (TD series).
Detective mindset for troubleshooting complex signalling failures using tools like Wireshark or roaming-specific platforms.
Proven ability to manage technical projects with external System Integrators and roaming partners.

Responsibilities

Design and maintain HLR/HSS subscriber templates, ensuring precise configuration of roaming profiles, APN/PDN contexts, and Camel/Diameter triggers.
Collaborate with roaming partners to implement and refine SoR logic within the HLR/HSS, ensuring subscribers attach to preferred networks based on cost and quality.
Lead the technical deployment of Full MVNO profiles, managing specific QoS profiles and addressing (GTs, APNs) required for independent network operations.
Act as the primary technical point of contact for our System Integrators, auditing HLR/HSS configurations, reviewing change requests, and ensuring alignment with the 2026 roadmap.
Define and monitor critical HLR/HSS KPIs, including Location Update (LU) success rates and Diameter Transaction per Second (TPS) limits.

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