Contributed to the irina-big/TeamProject and tonkeeper/ton-assets repositories by developing core features in Java and YAML, focusing on data modeling and configuration management. Built a robust Student data model with methods for age calculation, specialty transformation, and course determination, supported by comprehensive unit tests to ensure reliability and prevent regressions. Established an object-oriented structure with groundwork for future domain features, including a Bird class skeleton. In the tonkeeper/ton-assets project, implemented YAML-based metadata configuration and updated visual assets for the 道德經 Jetton, enabling accurate token presentation and discovery. Emphasized test-driven development, data serialization, and maintainable asset management practices.