Airalo

Senior Engineer, Core Network

Job Description

As our Senior Core Network Engineer, you aren't just maintaining servers; you are the architect of a borderless world. You will own the evolution of our global Packet Core, ensuring a traveler in Tokyo has the same seamless 5G experience as someone in London. If you enjoy the 'detective work' of deep-dive signaling analysis and the 'architect work' of building scalable 5G systems, this is your next challenge.


Your main responsibilities will be:
  • You’ll lead the design and growth of our Packet Core (EPC/5GC), ensuring our network scales effortlessly as our global traveler base doubles and triples.
  • You’ll be our primary architect for global connectivity, managing roaming coverage through IPX/GRX providers and securing bi-lateral agreements that keep our users online everywhere.
  • You’ll dive deep into signaling procedures across 3G, 4G, and 5G NSA. When a connection fails, you’re the expert who decodes the "why" using tools like Wireshark to look under the hood of Diameter and GTP signaling.
  • You’ll fine-tune critical network flows—from the moment a user "attaches" to the network to the creation of high-quality voice and data bearers—ensuring every byte is delivered with precision.
  • You’ll lead design reviews and manage the "Acceptance Testing" (ATP) phase to ensure our partners deliver to the high standards our users expect.

    • Does this sound like you?
  • You’ve spent significant time in the "engine room" of a Tier 1 Carrier, Mobile Operator, or a major Equipment Provider. You understand the stakes of a live, global network.
  • You are fluent in the language of mobile networks. Whether it's legacy 3G (SGSN/GGSN), dominant 4G (MME/PGW), or the transition to 5G, you understand how these systems interlock.
  • You have a rock-solid grasp of IP networking—BGP routing, subnets, and ASN management are second nature to you.
  • You understand that "it’s always DNS." You have hands-on experience architecting the DNS hierarchy (S-NAPTR) that allows mobile nodes to discover one another across the globe.

    • Bonus Points
  • You have practical experience working within the unique constraints and opportunities of an MVNO or MVNE environment.
  • You are excited about the future of telco and have experimented with or deployed Cloud Native Network Functions (CNF) and containerized cores.
  • You’ve worked with Local Breakout (LBO) strategies to ensure data takes the fastest path possible to the internet.
  • You have a niche understanding of managing roaming through Sponsor IMSIs to expand coverage quickly and efficiently.

    • Apply Now
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