• Development and maintenance of the back end using Java Spring, ensuring the robustness, scalability and performance of systems• Creation of dynamic and responsive user interfaces using React, HTML, CSS and Javascript, providing a superior user experience.• Implementation and administration of MySQL and PostgreSQL databases, including schema design, query optimizations, ensuring data integrity and version upgrade processes.• Creation and maintenance of unit, functional and integration tests, using the JUnit and Playwright tools.• Effective collaboration in global teams, using Git for version control and project development.• Deep expertise in Java programming, contributing to code efficiency and stability.• Implementation of scalable APIs, allowing effective communication between different parts of the system.