Developed the core accounting system for the Kraiimen/EsempiCorso repository, focusing on foundational account management and balance tracking features. Leveraged Java and object-oriented programming principles to implement deposit and withdrawal handling, refactor balance storage, and introduce a method for summing deposits. The work emphasized domain modeling and core transaction logic, ensuring accurate balance management and preparing the system for future enhancements such as reconciliation and reporting. No major bugs were addressed during this period, as the primary focus was on establishing a robust architecture to support reliable financial operations and maintain system integrity for subsequent development phases.