Own and maintain the signaling firewall platform and supporting infrastructure Investigate critical alerts, signaling anomalies, and fraud indicators Monitor network systems such as Core CS PS, VAS & Charging network elements (MSC, MSS, HLR, HSS, SGSN, GGSN, vEPC, VAS and OCS) Monitor signaling traffic (SS7, Diameter, GTP-C) Monitor and analyze signaling traffic using Elastic / ELK Stack Develop and tune detection rules, dashboards, and SQL queries Troubleshoot platform, performance, and logging pipeline issues Support system and network expansion, upgrades, and major configuration changes Collaborate with core network, IT, operations teams, and vendors Kualifikasi Strong understanding of 2G/3G/4G mobile core networks (5G is a plus) Experience in telecom security, mobile core, or security monitoring Hands-on experience with Elastic / ELK and SQL Bash scripting (Python is a plus) Solid networking fundamentals (TCP/IP, routing, VLAN, BGP) Experience with Wireshark or packet analysis tools Signaling security / SS7 / Diameter / GTP experience is highly valued