HLR / HSS / UDM Architect

HLR / HSS / UDM ARCHITECT The HLR / HSS / UDR / UDM Mobile Core Engineer will analyze, design, implement, and verify the configuration and integration of subscriber data management nodes, networks, and systems across our 2G through 5G infrastructure. Your scope of work includes introduction, upgrade, expansion, functionality, and capacity scenarios spanning legacy HLR environments through modern cloud-native UDM and UDR deployments. You will be a key contributor to the convergence of subscriber databases as OXIO evolves its MVNO platform toward 5G standalone architecture — and your work will directly shape the reliability and scalability of the networks our partners depend on. KEY RESPONSIBILITIES : - As part of the mobile core team, you will own the subscriber data management platform across our network generations. Your responsibilities include: - Manage and operate HLR, HSS, UDR, and UDM nodes across 2G, 3G, 4G, and 5G core domains, ensuring high availability and data integrity for subscriber profiles. - Design and maintain subscriber provisioning workflows, including IMSI/MSISDN management, service profiles, and roaming configurations. - Implement and verify MAP, Diameter (S6a, S6d, Cx, Sh, Zh), and HTTP/2-based (N8, Nudm) interfaces connecting subscriber data nodes to MSC, MME, AMF, SGSN, and other core elements. - Use and build dashboards to monitor subscriber node KPIs, quickly surface abnormal conditions, and identify patterns before they become outages. - Own incident management for the subscriber data domain: follow communications procedures for internal escalation and external vendor coordination, ensuring SLAs are met. - Perform maintenance, security audits, patching, and emergency response for HLR/HSS/UDM/UDR platforms. - Undertake fault handling and corrective actions at node, service, and infrastructure level, including protocol trace analysis (Wireshark/tcpdump) on Diameter, MAP, and HTTP/2 signaling. - Lead and contribute to project activities: E2E