- Developed and maintained microservices on Spring Boot, worked with old monolith projects using from Java 1.8 to Java 21.- Optimized and supported backend developments of Demir Bank banking system. Enhanced application functionality by adding new features and fixing bugs in existing systems.- Designed the entities, relations, and backend API architecture for some internal services.- Worked on page layout with HTML, CSS, and Thymeleaf.- Created new procedures, functions, triggers, packages, cursors using PL/SQL, and modified existing codes, tables, views.- Implemented an integration of external services via REST/SOAP.- Updated some old services from Java 8 to Java 17. Migrated data from PostgreSQL to Oracle DB.

- Managed full development, honed time management and teamwork. Integrated with Flexby for data exchange. Deployed on Heroku for scalability and availability.- Utilized fundamental aspects of Java such as Java Core, Collections, Multithreading, OOP, design patterns, databases, basic algorithms and data structures. Pet projects have been realized as Web applications based on RESTful services.- Mentoring students (reviewing works, giving feedback, answering questions).