Senior Core Network Engineer, HLR/HSS, SDM

🕒 March 23

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Airalo

WebsiteLinkedInAll Job Openings

51 - 200 employees

📡 Telecommunications

Telecommunications • Technology • Travel

Airalo is the world's first eSIM store that provides digital SIM cards (eSIMs) to travelers in over 200 countries and regions globally. The company offers an innovative solution to avoid high roaming charges by allowing users to purchase and activate eSIMs via its app, ensuring instant connectivity without the need for physical SIM cards. Airalo caters to various travelers by providing local, regional, and global eSIMs with transparent, prepaid pricing plans, supported by 24/7 customer service. The platform also supports partnership through APIs and offers incentives such as referral credits. Airalo represents a modern approach to global mobile connectivity, making it an essential tool for frequent travelers.

📋 Description

• 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