Marco Scarsella developed and enhanced backend features for the pagopa/p4pa-debt-positions and pagopa/p4pa-pu-bff repositories, focusing on scalable data access and robust API design. He implemented broker-aware debt position queries and introduced pagination-friendly endpoints, leveraging Java, Kotlin, and Spring Boot to improve data retrieval and downstream integration. His work included refactoring repositories to use JPQL, centralizing pagination logic, and expanding OpenAPI documentation for consistency and maintainability. Marco also improved auditability through enhanced logging and strengthened code governance by updating code ownership. His contributions demonstrated depth in backend engineering, emphasizing maintainable, testable, and well-documented service architectures.