Airalo

Senior Core Network Engineer

Airalo

full-time

Posted on:

Location Type: Remote

Location: Spain

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Job Level

Senior

Tech Stack

DNSIoT

About the role

  • 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 MME/SGSN to discover PGW/SGW/UPF nodes.
  • Plan and implement IP routing strategies, including ASN (Autonomous System Number) 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).
  • Apply in-depth understanding of 3GPP standards for 3G, 4G EPC, and 5G NSA mobile data call-flows.
  • Analyze and optimize critical flows, specifically Attach/Registration (Authentication vectors, ULR/ULA, Create Session) and Bearer Management (Dedicated bearer creation for VoLTE/QCI 1 and default bearers).
  • Utilize protocol analyzers such as Wireshark or Tektronix to decode ASN.1 based 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 design reviews for core network expansions.
  • Manage the ATP (Acceptance Testing) phase to ensure vendor deliveries meet operational standards prior to live deployment.

Requirements

  • Experience with a Tier 1 Carrier, Mobile-Operator, or Major Network Equipment Provider (NEP) background.
  • 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.
Benefits
  • Health Insurance, work-from-anywhere stipend, annual wellness & learning credits, annual all-expenses-paid company retreat in a gorgeous destination & other benefits
Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools
Packet CoreEPC5GCHSSUDMBGPDiameterASN managementIP routingQoS
Soft Skills
leadershiptroubleshootingtechnical evaluationcommunication