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Airalo Logo Airalo · IT - Software Development

Senior Core Network Engineer

Spain; United Kingdom · Job Posted January 31, 2026
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Requirements

  • I’ve been a Lead/Senior Engineer in a Tier 1 Carrier or Major NEP, managing massive subscriber scale
  • I’ve worked in a high-growth MVNO or MVNE environment, building flexible and agile core services
  • I’ve worked in smaller private networks or enterprise environments
  • Decoding ULR/ULA and Authentication flows on S6a
  • Troubleshooting GTP-C/GTP-U procedures on S5/S8 or S11
  • Debugging Gx or Gy Diameter interfaces to resolve quota or QoS issues
  • Managing flows across Iu-PS (3G) or EN-DC (5G NSA) signaling
  • Designing S-NAPTR records for MME/SGSN to discover PGW/SGW nodes
  • Managing ASN assignments and BGP peering for international roaming
  • Designing HSS/UDM profiles and APN configurations for specialized services (like IoT or IMS)
  • Implementing CUPS (Control and User Plane Separation) or Cloud-Native functions
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  • Experience with a Tier 1 Carrier, Mobile-Operator, or Major Network Equipment Provider (NEP) background
  • Deep understanding of SGSN, GGSN, and HLR architecture
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  • Design and dimension the Packet Core (EPC/5GC) to ensure scalability for data growth
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  • 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
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  • Perform deep-dive troubleshooting of signaling procedures across 3G (Iu-PS), 4G (S1-MME, S11, S5/S8), and 5G NSA (EN-DC)
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Not provided
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  • Roaming Architecture: Designing IPX/GRX connectivity and bi-lateral roaming agreements
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