Senior Core Network Engineer (HLR/HSS & SDM)

Airalo is looking for a Senior Core Network Engineer to join their fully remote Networks team. The team ensures customers have instant, smooth connectivity from the moment they purchase their plan to the moment they arrive at their destination. The engineer will design and maintain HLR/HSS subscriber templates, collaborate with roaming partners, and lead the technical deployment of Full MVNO profiles.

Requirements

• Deep technical mastery of MAP (SS7) and Diameter (S6a/S13) protocols
• 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

• Generous PTO
• Wellness and learning allowances
• Annual Airalo Away retreat