Designed and developed robust and scalable Java-based applications utilizing Spring framework Implemented security measures for sensitive data using Spring Security Optimized database performance by integrating JPA and Hibernate for data persistence Improved application performance with the implementation of Hazelcast for caching and RabbitMQ for messaging Migrated databases to AWS RDS and managed data using Liquibase and Flyway Utilized AWS stack, including SQS, ESR, ESC, S3, CloudFront, and RDS, to achieve high availability and reliability of the application Worked with multiple databases including MySQL, PostgreSQL, MongoDB, Redis, GraphDB, and DiamondDB.