Matheus Ti focused on enhancing code quality within the hiero-ledger/hiero-sdk-java repository by refactoring SDK classes to replace wildcard imports with explicit imports. This targeted change improved code clarity and maintainability, reducing the risk of import-related issues and simplifying future refactoring efforts. Working exclusively in Java, Matheus applied disciplined software refactoring and code hygiene practices to ensure the codebase remained stable, with no new bugs introduced during the process. The improvements facilitated easier onboarding for new contributors and streamlined code reviews, demonstrating a methodical approach to long-term maintainability and readability in a Java-based software development environment.