Senior Core Network Engineer

1 month ago
Full-time
Senior
DevOps and Infrastructure
Airalo

Airalo

Airalo is the world's first eSIM store offering travelers access to eSIMs in 200+ countries & regions at affordable prices. With Airalo, travelers can manage their eSIMs, top up on the go, and enjoy pain-free connectivity while traveling. Say goodbye t...

Airlines
51-250
Founded 2019
$67M raised

Description

  • 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 bilateral agreements.
  • Define 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 MME/SGSN discovery of PGW/SGW/UPF nodes.
  • Plan and implement IP routing strategies, including ASN management and BGP peering for internet and roaming connectivity.
  • Manage Access Point Name (APN) configurations for IMS, Internet, IoT, and other service types.
  • 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 call flows such as Attach/Registration (authentication vectors, ULR/ULA, Create Session) and Bearer Management (default and dedicated bearers).
  • Use protocol analyzers (e.g., Wireshark, Tektronix) to decode ASN.1 messages and Diameter signaling (Gx, Gy, S6a, S5, S8, GTP-C, GTP-U).
  • Act as the primary technical interface with core network vendors, system integrators, and partners, lead technical evaluations and manage ATP (Acceptance Testing) prior to live deployment.

Requirements

  • Experience working with a Tier 1 carrier, mobile operator, or major Network Equipment Provider (NEP).
  • Deep understanding of SGSN, GGSN, and HLR architectures and extensive experience with PGW, HSS, SGW, and MME.
  • Proficiency with 5G Non-Standalone (NSA), 5G Standalone (SA), and Policy and Charging Control (PCC).
  • Hands-on experience with Diameter interfaces including S6a, Gx, and Gy.
  • Strong knowledge of IP addressing, subnetting, OSPF/BGP routing, VRFs, and ASN management.
  • Expert-level DNS resolution knowledge (A, AAAA, SRV, NAPTR), DHCP, and IPX/GRX management.
  • Practical experience decoding and analyzing signaling and control-plane protocols using tools like Wireshark or Tektronix.
  • Preferred: experience managing inbound/outbound roaming via Sponsor IMSI providers and working within MVNO or MVNE environments.
  • Preferred: familiarity with GTP-Proxy deployments, Regional/Local Breakout (LBO) strategies, and Cloud Native Network Functions (CNF) or containerized core deployments.

Benefits

  • Health insurance provided.
  • Work-from-anywhere stipend to support remote-first work.
  • Annual wellness and learning credits.
  • Annual all-expenses-paid company retreat.
  • Full-time, employee role with additional benefits (remote-first work environment).

Interested in this position?

Apply directly on the company website

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