Senior Java Developer

Essential

• Strong background in Java/J2EE development, with experience in building and consuming REST APIs, multi-threaded processing and concurrency, along with proficiency in scripting (Shell/Python/Perl) for automation, tooling, and monitoring.
• Strong experience with WebLogic Application Server, including deployment and tuning of Java applications, JVM performance optimization, cluster management, JDBC tuning and thread pool configuration, along with troubleshooting of memory leaks, stuck threads, and connection-related issues.
• Good to have expertise in Oracle OCOMC/ONM (v6/12/15), including cartridge development (EEs, PO components, Chains, Pipelines), NPL scripting for transformation, enrichment and correlation, CDR parsing, normalization and aggregation, file collection and distribution, high-throughput processing of multi-network event types, along with deployment, performance tuning and troubleshooting of mediation workflows.
• Experience with Netcracker Revenue Manager (NCRM/NC-RM) or equivalent rating ecosystems, including rating engine concepts, charge calculation flows, configuration of price plans, rating rules, usage types, event models
• Proven ability in debugging rating discrepancies and missing usage events, working with product catalog, tariff models, charging rules and discounts, ensuring seamless Mediation Rating Billing alignment, and supporting both batch and near-real-time rating workflows.
• Strong understanding of telecom network feed formats supporting Mediation and Rating systems, including Diameter (CCR/CCA), ASN.1-based CDRs, TAP/RAP/NRTRDE for roaming, 3GPP CDR formats (VoLTE, 5G, GTP, SIP, CAMEL), IPDR, and vendor-specific formats (Huawei, Ericsson, Nokia, Cisco), along with the ability to decode, interpret, map, and troubleshoot raw network events.