Boaz Carucci enhanced the Hackaton-Yad-Tamar/Back repository by designing and implementing three new Pydantic-based data transfer objects (DTOs) to support user sign-in, sign-up, and manager data flows. Focusing on backend development and data modeling in Python, he centralized schema definitions in a dedicated directory and introduced inheritance to streamline shared fields, improving maintainability and code organization. His work emphasized strict data validation and contract stability, reducing the risk of downstream integration issues. By refining DTOs to support post-signup and volunteer-specific data, Boaz prepared the codebase for scalable authentication features while ensuring data integrity and clarity throughout the API design.