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Airalo is the world's first eSIM store, helping millions of travelers access affordable mobile data in 200+ countries and regions. The company is fully remote, with 400+ employees across 60+ countries, and is building a product used by travelers daily.
As a Core Network Engineer, you will design and lead the implementation of Airalo's core network infrastructure. Your responsibilities include:
• Designing the IP infrastructure of multi-site data centers
• Designing GRX/IPX interconnectivity and global Point of Presence (PoP) structure to access mobile partner networks
• Defining WAN network strategy
• Leading the realization of data center LAN and WAN networks, including configuration of DRAs, GTPs, GGSN/PGW, SBC, firewalls, and routers
• Integrating direct roaming agreements and sponsored roaming agreements
• Tracing signaling and user plane transport for debugging issues
• Acting as primary interface between the Core Network team and Airalo's Platform team, Network Operations team, and technology partners (vendors, roaming partners)
• Core network optimization and enhancement
• Supporting operations team with deployments, rollouts, performance improvements, training, and partner operations support
You will work in a fully remote environment with a genuinely global team united by a shared mission to make travel simpler. The company values trust, ownership, and freedom to do great work without unnecessary bureaucracy. English is the main working language for both synchronous and asynchronous communication.
REQUIREMENTS:
• Technical degree in Engineering or Telecommunications preferred, or equivalent demonstrated experience
• Minimum 3–5 years of relevant experience in the telecom core field
• 3+ years of experience with network elements: Packet Gateway (GGSN/PGW/DPI), direct and sponsored roaming (HLR/HSS), diameter routing, GTP, and GRX
• 3+ years of experience with protocols: Sigtran MAP (Mobile Application Protocol), Sigtran CAP (Camel 1–3), Diameter (Ro, Gx, Gy, Gn, Gi), REST API, and BGP
• Excellent verbal and written communication skills
BONUS:
• IREG Testing experience
• International working experience
