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Senior Core Network Engineer (HLR/HSS & SDM)

Airalo Pte. Ltd.

Job Overview

Location

Europe

Job Type

Full-time

Full Job Description

📋 Description

• Senior Core Network Engineer (HLR/HSS & SDM) at Airalo Pte. Ltd., a fully remote role based in Europe, responsible for designing, maintaining, and optimizing the core telecommunications infrastructure that enables seamless global eSIM connectivity for over 20 million travellers across 200+ countries and regions. This role is critical to ensuring instant, reliable, and secure network access from purchase to destination, directly supporting Airalo’s mission as the world’s first and largest eSIM store.
• Day-to-day responsibilities include architecting and managing Home Location Register (HLR), Home Subscriber Server (HSS), and Subscription Data Management (SDM) systems; troubleshooting complex signaling protocols (Diameter, SS7, SIP); optimizing network performance and latency for global roaming scenarios; collaborating with product and engineering teams to translate ambitious connectivity features into scalable network solutions; conducting reverse-engineering of legacy telecom systems to enable innovative eSIM provisioning; monitoring network health and implementing automated remediation for service degradation; participating in on-call rotation to ensure 24/7 network reliability; contributing to technical documentation and knowledge sharing across the fully remote Networks team.
• The Networks team at Airalo is a fully remote, globally distributed group of engineers passionate about redefining global connectivity through innovative telecom solutions. Operating with high autonomy and a customer-first mindset, the team owns end-to-end network performance and reliability, working closely with product, DevOps, and security teams to deliver seamless experiences for international travellers. Airalo’s culture emphasizes ownership, experimentation, and real-world impact, where engineers are encouraged to think beyond traditional telecom boundaries and build systems that scale with global demand.
• In this role, you will deepen your expertise in legacy and modern telecom core networks while gaining hands-on experience with cloud-native telecom architectures, SDM evolution, and API-driven network services. You will have the opportunity to influence the design of next-generation connectivity platforms, work at the intersection of telecom and internet-scale systems, and contribute to Airalo’s expansion as a trusted global connectivity partner — all while developing leadership skills in a fast-growing, mission-driven startup environment.

🎯 Requirements

• Proven experience designing, deploying, or managing HLR/HSS and SDM systems in live telecommunications environments
• Deep understanding of Diameter, SS7, SIP, and other core telecom signaling protocols
• Strong background in network optimization, latency reduction, and high-availability systems at scale
• Experience with Linux-based systems, scripting (Python/Bash), and telecom-specific tools (e.g., Wireshark, sngrep)
• Ability to work independently in a fully remote setting with excellent communication and documentation skills
• Familiarity with cloud platforms (AWS/Azure/GCP) and containerization (Docker/Kubernetes) is a plus

🏖️ Benefits

• Fully remote work arrangement with flexibility to operate from any European location
• Generous paid time off (PTO) and company-wide recharge days
• Annual wellness and learning stipends to support personal and professional growth
• Participation in Airalo’s annual company retreat (Airalo Away) for team bonding and strategic alignment
• Access to cutting-edge telecom projects impacting over 20 million global users
• Equity opportunities and competitive compensation aligned with impact and experience

Skills & Technologies

Senior

Remote

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Airalo Pte. Ltd.

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About Airalo Pte. Ltd.

Airalo Pte. Ltd. operates a global marketplace for eSIM mobile data plans, enabling travelers to buy affordable, on-demand cellular service in 200+ countries without physical SIM cards. Founded in 2019 and headquartered in Singapore, the company partners with local carriers to provide prepaid data packages accessible via its mobile and web platforms, targeting cost-conscious and convenience-seeking international travelers.

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