Rajesh Kumar
Sr. Cloud DevOps Engineer | AWS, Azure,Terraform, Kubernetes, CI/CD, Java, Python, Ansible, Red Hat, CentOS
- Role
- Senior Middleware Administrator at Citizens
- Location
- Pittsburgh, PA, US
- LinkedIn followers
- 500 followers
About Rajesh Kumar
Senior Full Stack Java Developer with 10+ years of experience designing, developing, and…
Experience
Senior Middleware Administrator
Apr 2024 — Present · Johnston, RI, US
Administered and supported large-scale enterprise middleware environments using WebSphere Application Server, Oracle WebLogic Server, JBoss, Apache Tomcat, and HTTP Server, ensuring high availability, scalability, and uninterrupted service for mission-critical banking, lending, payments, and financial applications. · Performed end-to-end middleware administration including installation, configuration, domain creation, server provisioning, cluster setup, node synchronization, patching, version upgrades, and environment refresh activities across development, QA, UAT, and production environments. · Managed 24x7 enterprise production support by handling critical incidents, performing root cause analysis, resolving application outages, troubleshooting middleware failures, and ensuring SLA compliance for high-priority banking applications. · Configured and maintained WebSphere cells, WebLogic domains, managed servers, clusters, and JBoss standalone/domain mode environments, ensuring optimized workload distribution, fault tolerance, and seamless application failover. · Deployed and managed enterprise Java applications (EAR, WAR, JAR) across middleware environments, supporting release cycles, deployment validation, rollback planning, and production release coordination with development and DevOps teams. · Performed advanced JVM performance tuning including heap sizing, garbage collection optimization, thread pool tuning, connection pool tuning, and memory utilization analysis to improve application throughput and reduce latency under heavy workloads. · Conducted deep performance diagnostics using thread dumps, heap dumps, GC logs, CPU utilization reports, and memory analysis, identifying bottlenecks, deadlocks, thread starvation, and resource contention issues affecting production systems.
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