During January 2025, this developer delivered a Leap Year Calculation feature for the JoyOfCodingPDX/KatasWinter2025 repository, implementing a LeapYears class with constructor-based year initialization and comprehensive leap-year logic. The work followed a test-driven development approach, with iterative commits reflecting both solo and pair-programming practices. Unit testing in Java ensured correctness and reliability of the date calculation functionality. Additionally, the developer addressed documentation accuracy by updating ICanEditThisRepo.txt, replacing outdated terminology to improve onboarding clarity. Through focused use of Core Java and Java Development skills, the contributions enhanced code quality, maintained up-to-date documentation, and supported user-facing reliability for the project.