Senior Engineer, Core Network

About Airalo

Alo! Airalo is the world’s first eSIM store that helps people connect in over 200+ countries and regions across the globe. We are building the next digital service that revolutionizes the telecom industry. We are a travel-tech company and an equal-opportunity environment that values and executes diversity, inclusion, and equity. Our team is spread across 50+ countries and six continents. What glues us together is our commitment to changing the way you connect.

Check out more information about Airalo in our Public Handbook: (Use the "Apply for this Job" box below).-handbook

We hope that you care deeply about the quality of your work, the intrinsic worth of tasks, and the success of your team. You are self-disciplined and do not require micromanagement in terms of your skillset and work ethic. You do your best to flourish as an individual every day while working hard to foster a collaborative team environment. You believe in the importance of being — and staying — authentic, honest, positive, and kind.

You are a good interlocutor with clear and concise communication. You are able to manage multiple projects, have an analytical mind, pay keen attention to detail, and love to get your hands dirty. You are cognizant, tolerant, and welcoming of vulnerabilities and cultural differences.

Position
:
Full-time / Employee

Location
:
Remote-first

Benefits
:
Health Insurance, work-from-anywhere stipend, annual wellness & learning credits, annual all-expenses-paid company retreat in a gorgeous destination & other benefits

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.

• 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.

• 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.

• 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.

If you are interested in this position,
please apply via the link.

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