- Developed and maintained RESTful APIs using Spring Boot and DropWizard, facilitating seamless integration with financial systems and improving backend efficiency by 30%.- Implemented backend logic in Java to manage complex data transformations and interactions with MySQL and PostgreSQL databases, optimizing query performance by 25%.- Designed and configured secure user interfaces and forms for account creation and financial applications using Angular, ensuring a responsive and user-friendly experience.- Optimized application performance through backend enhancements and database tuning, leading to a 20% reduction in response times.- Deployed and managed backend services on AWS, leveraging services like EC2, RDS, and S3 to ensure high availability and scalability of the onboarding platform.- Conducted user testing to gather feedback and iteratively improve the onboarding process, resulting in a 15% increase in user satisfaction.- Enhanced system scalability and performance by optimizing database interactions and deploying APIs in Unix/Linux environments, supporting a growing user base without performance degradation.

- Developed foundational Java applications, focusing on core concepts such as data types, control structures, and basic algorithms, leading to the successful completion of over 15 backend modules.- Implemented object-oriented programming principles in Java, creating and managing more than 20 classes and interfaces, and using inheritance and polymorphism to enhance code reuse and reduce duplication by 25%.- Applied basic multithreading concepts to handle concurrent tasks, improving the performance of multi-threaded applications by 20%.- Conducted unit testing of Java applications using JUnit, achieving a 90% code coverage rate and identifying and fixing over 25 critical bugs to ensure high-quality backend functionality.- Utilized core Java libraries for file handling and input/output operations, processing over 100 data files and optimizing data manipulation tasks, leading to a 33% reduction in processing time.- Developed and optimized SQL queries for Oracle databases, focusing on CRUD operations and complex joins, managing over 2,500 records and improving query performance by 30%.- Integrated Java applications with Oracle databases using JDBC, implementing efficient data retrieval and update operations, resulting in a 25% reduction in data access times.- Collaborated on backend development projects using version control systems like Git, ensuring smooth integration of code changes and adhering to best practices in a team environment.