Airalo

Senior Core Network Engineer, HLR/HSS, SDM

Airalo

full-time

Posted on:

Location Type: Remote

Location: Spain

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Job Level

Senior

About the role

  • 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.

Requirements

  • Deep technical mastery of MAP (SS7) and Diameter (S6a/S13) protocols; additional experience with VoLTE Roaming (S8HR) or SMSoIP rollout is a significant advantage.
  • Subscriber Mapping: 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.
  • A solid understanding of GSMA IREG (IR series); familiarity with TADIG (TD series) and how HSS/HLR templates impact billing/settlement is preferred.
  • A "detective" mindset for troubleshooting complex signalling failures using tools like Wireshark or roaming-specific platforms (e.g., Mobileum, Roamware, or SIGOS).
  • Proven ability to manage technical projects with external System Integrators and roaming partners under tight deadlines.
Benefits
  • remote work
  • generous PTO
  • wellness and learning allowances
  • annual Airalo Away retreat
Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools
HLRHSSMAP (SS7)Diameter (S6a/S13)VoLTE Roaming (S8HR)Subscriber MappingMulti-IMSI appletsGSMA IREGTADIGQoS profiles
Soft Skills
troubleshootingproject managementcollaborationcommunicationleadershipauditingalignmentcritical thinkingproblem-solvingdetective mindset