Sachin Sharma

Oracle Banking Branch (OBBRN) Project:

• Performed performance testing and tuning of Oracle Banking applications, including load testing, scalability testing, stress testing, and endurance testing, ensuring system stability and optimal performance across releases.
• Captured UI flows and developed JMeter scripts for cash withdrawal, cheque withdrawal, and cash deposit scenarios to streamline performance testing.
• Set up the complete OBBRN environment on a Linux server using Podman, deployed all required WAR files/services using custom Tomcat images and Docker Compose, configuring volumes and service properties.
• Built an automation shell script (using AI tool Cline) to: trigger JMeter runs in CLI mode, capture AWR report snapshots (start/end), collect GC logs, and run OSWatcher auto generating a complete post-run report.
• Analysed performance reports to identify slow APIs/services, CPU utilisation breaches on App and DB servers, and raised bugs with fixes.
• Captured Java Flight Recordings (JFR) during load runs to identify code-level thread contentions; validated fixes on local server before raising defects.
• Reviewed AWR reports for total wait events, elapsed times, and top SQL — raised bugs where performance thresholds were exceeded.
• Conducted scalability testing and documented findings in a detailed PPT and report shared with the domain team.

Garbage Collection Algorithm POC:

• Developed a Spring Boot application (generated using AI tool Cline) with REST endpoints for customer creation, query by ID, and query by name, along with a relational schema (customer, address, and contact tables).
• Containerized the application using Podman and configured monitoring for CPU, memory utilization, and GC activity.
• Designed and executed JMeter load test scripts covering all application endpoints.
• Automated 32-hour performance test cycles using AI tool Cline, orchestrating 4 one-hour runs with 6 hours idle time after each run for efficient resource utilization.
• Automated execution included: JMeter test runs, AWR snapshot capture and report generation, GC log collection, and system/application monitoring.
• Collected performance metrics by exporting CSV data from Grafana dashboards via Prometheus APIs for application nodes, database nodes, and container (POD) environments.
• Utilized shell scripting for orchestration and Python scripts for data processing and graph generation, enabling detailed performance visualization.
• Generated a comprehensive report package (ZIP) at the end of execution, including AWR reports, GC logs, performance graphs, and analysis outputs.
• Analyzed JDK 17 GC algorithms (G1GC, ZGC, ParallelGC) focusing on throughput, memory behavior, response time, and resource utilization; recommended optimal GC strategy to enhance performance.

Collaborated with client WSH Horizon to assess project requirements.

• Administered and managed Oracle Cloud Infrastructure (OCI) PaaS and SaaS products for client WSH Horizon —a provider of tailored infrastructure solutions specialising in parking management, construction, and facilities management.
• Managed OCI PaaS/SaaS products including Oracle ERP Cloud, Oracle Integration Cloud (OIC), Data Models, and related services.
• Administered and maintained WebLogic Server, ensuring high availability, performance, and stability of applications.
• Deployed application functions and code across QA, UAT, and Production environments, ensuring seamless transitions and stability.
• Conducted performance analysis and troubleshooting using heap and thread dumps to identify and resolve memory leaks and bottlenecks.
• Monitored systems and proactively resolved issues to maintain system reliability and performance.
• Coordinated planning and execution of release deployments with development and cross-functional teams, minimizing downtime and enhancing system reliability.
• Managed source code and deployment artifacts using GitHub Desktop and version control best practices.

Engaged as primary contact for client Bell Canada.

• Managed API Gateway (APIGW) platform, overseeing configuration, deployment, and maintenance of APIs and policies to ensure optimal functionality.
• Configured and supported API Gateway components such as Policy Manager, security policies, and backend integrations.
• Deployed and managed APIs/services (XML, XQuery, WSDL) across OSB and API Gateway environments.
• Managed WebLogic (11g/12c) and OSB/ESB environments, including domain setup, clusters, managed servers, and Node Manager.
• Performed application deployments (EAR/WAR/JAR) using Admin Console and automation scripts in non-production environments.
• Performed performance tuning, focusing on JVM tuning, Garbage Collection optimization, and memory leak analysis to enhance system performance.
• Implemented security configurations, including SSL setup, certificate management, and access controls across middleware and API Gateway layers.
• Monitored systems using Dynatrace, created dashboards, and performed proactive troubleshooting and performance analysis.
• Administered Linux (RHEL/CentOS) servers including installation, configuration, patching, and security hardening.
• Collaborated with cross-functional teams (Dev, Infra, Network) to resolve complex technical issues.
• Performed incident management and root cause analysis (RCA) for critical production issues.
• Ensured high availability, reliability, and performance of enterprise applications.

• Middleware Engineer having experience in Oracle WebLogic (11g/12c) and Oracle Service Bus (OSB/ESB) administration.
• Installed, configured, and administered WebLogic domains, including clusters, managed servers, and Node Manager, ensuring optimal system performance.
• Proficient in application deployment (EAR/WAR/JAR) in clustered environments using Admin Console and automation scripts.
• Expertise in deployment of XML, XQuery, WSDL, and integration services in OSB environments.
• Performed performance tuning, including JVM tuning, garbage collection, heap optimization, and memory leak analysis to enhance application efficiency.
• Experience in WebLogic server upgrades, patching, and JDK migrations.
• Experience in monitoring and troubleshooting using Dynatrace, including dashboard creation and performance analysis.
• Knowledge of JDBC configuration, SSL setup, and certificate management for secure environments.