Senior Core Network Engineer (HLR/HSS & SDM)

4 months, 2 weeks ago
Full-time
Senior
DevOps and Infrastructure
Airalo

Airalo

Airalo is the world's first eSIM store offering travelers access to eSIMs in 200+ countries & regions at affordable prices. With Airalo, travelers can manage their eSIMs, top up on the go, and enjoy pain-free connectivity while traveling. Say goodbye t...

Airlines
51-250
Founded 2019
$67M raised

Description

  • Design and maintain HLR/HSS subscriber templates, including roaming profiles, APN/PDN contexts, and Camel/Diameter triggers.
  • Collaborate with roaming partners to implement and refine Steering of Roaming logic within HLR/HSS.
  • Lead the technical deployment of Full MVNO profiles, including QoS profiles and addressing required for independent network operations.
  • Act as the primary technical point of contact for system integrators, reviewing HLR/HSS configurations and change requests.
  • Define, monitor, and improve HLR/HSS KPIs such as Location Update success rates and Diameter TPS limits.
  • Support subscriber mapping and roaming logic across HLR, HSS, and UDM environments.
  • Troubleshoot complex signalling and configuration issues in partnership with external vendors and roaming partners.

Requirements

  • Deep technical mastery of MAP (SS7) and Diameter (S6a/S13) protocols.
  • Experience with VoLTE Roaming (S8HR) or SMSoIP rollout is a significant advantage.
  • Extensive experience with HLR, HSS, and UDM in a multi-tenant or MVNO environment.
  • Practical experience with Multi-IMSI applets and sponsor IMSI roaming logic.
  • Solid understanding of GSMA IREG (IR series); familiarity with TADIG (TD series) is preferred.
  • Experience with HSS/HLR templates and their impact on billing and settlement is preferred.
  • Strong troubleshooting skills using Wireshark or roaming platforms such as Mobileum, Roamware, or SIGOS.
  • Proven ability to manage technical projects with external system integrators and roaming partners under tight deadlines.
  • Bonus points for experience with 5G UDM and AUSF.
  • Bonus points for knowledge of cloud-native network functions (CNF) and containerised core deployments.
  • Bonus points for scripting in Python or Bash for automation, audits, or log parsing.

Benefits

  • Fully remote work.
  • Generous PTO.
  • Wellness allowance.
  • Learning allowance.
  • Annual Airalo Away retreat.
  • The opportunity to work on a global connectivity product used by millions of travellers.
  • Reasonable accommodations and an equal-opportunity workplace.

Interested in this position?

Apply directly on the company website

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