I served as a backend engineer, contributing to developing an extensive ecosystem of applications. This ecosystem encompassed a back-office app, a customer reclamation platform, a dedicated merchant app, and a mobile app enabling payments and account aggregation based on ISO 20022. Leveraging Spring Boot and Microservice architecture, I designed and built the backend functionalities for these applications, ensuring seamless integration with the payment gateway and account aggregation services. PostgreSQL was used for reliable data management throughout the system, guaranteeing a robust and scalable solution.