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Exp Range - 7 to 15 Yrs Mandatory Technical Skills - Core Senior-level Java development (7+ years) backend, with solid OOP and design fundamentals. Hands-on experience with OpenCloud Rhino and JAIN SLEE application development. Good to have exp with SAP Convergent Charging (SAP CC) configuration, development and/or integration in a real-time charging context. Telecom Domain & Protocols Convergent / online charging domain: rating, prepaid call control, CDR processing, subscriber account management. Telecom protocols: SIP, Diameter, SS7 / IN (CAPv2, MAP). Understanding of IVR / media handling and call-flow / routing configuration. Platform & Tooling Oracle and SQL; Linux / Red Hat Enterprise Linux administration and troubleshooting. Build & version control: Maven, Git; ticketing with JIRA. Experience operating in production support (L2/L3), MOP execution and maintenance windows. 6. Nice-to-Have / Desirable Skills Experience with Dialogic PowerMedia XMS, WebRTC or IVR platforms. EAI / integration layers, CRM (vTiger / PHP) and BI / Jasper reporting. Monitoring with Zabbix; automation/deployment with Chef or Ansible. IMS / SIP integration experience (e.g., Huawei IMS) and NGN/NGIN migration. Test automation frameworks (Robot Framework, JMeter, Seagull/SIPp) .