Java Developer

What youll need to succeed (Skills & Experience)

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.

Desirable

• 4–7 years of hands-on software development experience with strong proficiency in Java and related technologies
• Minimum 2 years of deep, practical experience in delivering OCOMC (Offline Mediation Controller) solutions, including cartridge development, NPL scripting, mediation and rating workflows, CDR processing, and production deployments.
• Proven experience in building, enhancing, and maintaining high volume mediation pipelines capable of processing billions of daily events with high accuracy, low latency, and strong fault tolerance.
• Strong exposure to telecom network event formats such as Diameter, ASN.1, TAP/RAP/NRTRDE, IPDR, and various 3GPP CDR structures, with the ability to analyse, decode, and map raw feed data.
• Hands on expertise with CI/CD pipelines using tools like Jenkins, Git, Maven, Nexus, or equivalent—covering build automation, artifact management, testing, deployment workflows, and rollback strategies.
• Solid experience in production system problem solving, including issue triage, deep-dive debugging, RCA creation, and working closely with operations to ensure system stability.
• Experience creating and maintaining monitoring and observability scripts (Shell/Python, Dyantrace), integrating with tools like Grafana, Prometheus, ELK, OEM, or custom dashboards to track throughput, error rates, latency, and system health.
• Demonstrated ability to work on complex, large-scale distributed systems, particularly those involving high-volume ETL flows into Billing, Assurance, Fraud, and MIS platforms.
• Experience collaborating in cross-functional squads, working in Agile environments, and contributing to improvement initiatives related to automation, performance tuning, and resiliency.