Airalo is looking for a Senior Core Network Engineer to spearhead the evolution of our global mobile data network. In this pivotal role, you will lead the design, deployment, and expansion of our Packet Switched (PS) Core, providing hands-on ownership from high-level architecture to low-level protocol analysis for 3G, 4G LTE, and 5G NSA architectures. You will be the primary technical interface with vendors and partners, ensuring seamless rollout and operation of critical network functions that change the way the world connects.

What You'll Do

Design and dimension the Packet Core (EPC/5GC) to ensure scalability for data growth.
Manage roaming coverage with IPX/GRX providers, roaming sponsors, and direct bi-lateral agreements.
Define specific network profiles and configurations for HSS/UDM subscribers, including QoS, AMBR, and APN subscriptions.
Architect the DNS hierarchy for the mobile core, focusing on S-NAPTR records for node discovery.
Plan and implement IP routing strategies, including ASN management and BGP peering for internet and roaming connectivity.
Manage Access Point Name configurations for various service types, including IMS, Internet, and IoT.
Perform deep-dive troubleshooting of signaling procedures across 3G (Iu-PS), 4G (S1-MME, S11, S5/S8), and 5G NSA (EN-DC).
Analyze and optimize critical flows, specifically Attach/Registration and Bearer Management.
Utilize protocol analyzers to decode ASN.1 based messages and Diameter signaling.
Act as the primary technical interface with core network vendors, system integrators, and partners.
Lead technical evaluations and design reviews for core network expansions.
Manage the ATP phase to ensure vendor deliveries meet operational standards prior to live deployment.

What We're Looking For

Experience with a Tier 1 Carrier, Mobile Operator, or Major Network Equipment Provider.
Deep understanding of SGSN, GGSN, and HLR architecture.
Extensive experience with PGW, HSS, SGW, and MME.
Proficiency in 5G Non-Standalone (NSA), 5G Standalone (SA), and PCC.
Hands-on experience with Diameter S6a (HSS-MME), Gx (PCRF-PGW), and Gy (OCS-PGW).
Strong knowledge of IP addressing, subnetting, OSPF/BGP routing, VRFs, and ASN management.
Expert-level DNS resolution (A, AAAA, SRV, NAPTR), DHCP, and IPX/GRX management.

Nice to Have

Experience managing inbound/outbound roaming via Sponsor IMSI providers.
Technical knowledge of GTP-Proxy deployments for signaling and payload optimization.
Practical experience working within an MVNO or MVNE environment.
Familiarity with Regional and Local Breakout (LBO) strategies to reduce latency.
Experience with Cloud Native Network Functions (CNF) and containerized core deployments.

Technical Stack

Wireshark
Tektronix

Benefits & Compensation

Health Insurance
Work-from-anywhere stipend
Annual wellness & learning credits
Annual all-expenses-paid company retreat

Work Mode

This is a global, remote-first position within a team spread across 50+ countries and six continents.

Airalo is an equal-opportunity employer and values diversity, equity & inclusion. They do not discriminate on the basis of race, religion, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.