Sr Core Solution Architect

1. 10-15 years in telecom solution architecture with multiple end-to-end EPC deliveries and at least one production 5G Core program.
2. Proven delivery of national roaming for LTE and/or 5G, including:
   1. Design and rollout with major partners; direct peering and/or IPX; onboarding playbooks and SLA/KPI frameworks.
   2. Diameter (S6a/S8/S9), DRA/DEA, GTP-C/U and firewalling; VoLTE roaming (S8HR/LBO) and SBC interconnect.
   3. 5G SEPP (N32), SBI proxying/SCP, TLS/OAuth2 security, header enrichment; BCE-based settlement.
   4. GSMA practices and testing (e.g., IR.21 data, IR.65/IR.88 concepts, IREG/TADIG).
3. Deep knowledge of:
   1. 4G EPC: MME, SGW/PGW, HSS, PCRF; GTP, SCTP; Diameter (S6a/Gx/Gy/Gz/Rf/Ro).
   2. 5G Core: AMF, SMF, UPF, UDM/AUSF/UDR, NRF, PCF, CHF/CCS, NEF, BSF, SCP, SEPP; PFCP; HTTP/2 SBI.
   3. IMS/VoLTE/VoNR/VoWiFi, emergency call handling, SMS over NAS/IP.
   4. Provisioning/charging integrations: TMF APIs (TMF641/TMF640), mediation, online/offline charging, TAP3/BCE.
4. Strong CNF/cloud-native background: Kubernetes, HA/geo-redundancy, CI/CD, GitOps.
5. Vendor integration experience with at least one major Core/IMS vendor and a charging platform.
6. Excellent documentation, stakeholder management, and workshop facilitation.

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