At a Glance
- Tasks: Design and maintain HLR/HSS templates for global roaming efficiency.
- Company: Join Airalo, the world's first eSIM store, fully remote with a diverse team.
- Benefits: Competitive salary, flexible remote work, and opportunities for professional growth.
- Other info: Dynamic work environment with clear ownership and exciting challenges.
- Why this job: Make a real impact on global connectivity while enjoying autonomy in your role.
- Qualifications: Deep knowledge of MAP and Diameter protocols; experience with HLR/HSS is essential.
The predicted salary is between 75000 - 110000 £ per year.
Help Us Build The Future of Travel. At Airalo, we make it easier for people to stay connected wherever they travel. As the world's first eSIM store, we help millions of travelers access mobile data in over 200 countries and regions. We’re a fully remote team of 400+ people across 60+ countries, building a product used at a global scale every day. Work here is structured but fast-moving, with clear ownership and the space to make decisions without unnecessary layers.
Your Next Destination:
- Location: Remote, anywhere in the UK.
- Contract: Full-time, permanent.
- Languages: English is our main working language day to day, so you'll need to be comfortable communicating in it both in meetings and async.
As our Senior HLR/HSS Specialist, you are the guardian of our subscriber data and the architect of our roaming efficiency. You won't just manage databases; you will own the life-cycle of HSS/HLR templates that allow our MVNO to scale globally. Your expertise in Profile & Template Engineering is critical to our success in maximising COGS and margin through sophisticated Steering of Roaming (SoR) and Sponsor Roaming integrations.
Your main responsibilities will be:
- 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.
What you’ll need:
- Deep technical mastery of MAP (SS7) and Diameter (S6a/S13) protocols; additional experience with VoLTE Roaming (S8HR) or SMSoIP rollout is a significant advantage.
- 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
Senior Core Network Engineer (HLR/HSS & SDM) employer: Airalo
Airalo is an exceptional employer that empowers its remote teams to take ownership and make a real impact in the travel industry. With generous benefits such as remote work flexibility, wellness allowances, and opportunities for professional growth, employees thrive in a culture that values curiosity and collaboration. Join us in shaping the future of connectivity for millions of travellers while enjoying a supportive environment that encourages innovation and personal development.
