Worked on the PPartisan/Roky repository to deliver a robust username handling flow within the Profile module, focusing on centralizing and enforcing business logic for user onboarding. Developed and integrated the RequestUserNameUseCase, which governs username requests and validation by rejecting blank entries and applying length-based rules to ensure deterministic outcomes. This use case was implemented in Kotlin, leveraging use case implementation patterns to promote consistency and maintainability across the user lifecycle. The approach improved traceability by linking work to specific commits, and addressed the need for reliable, centralized validation logic without introducing bug fixes during the development period.