Over a two-month period, contributed to the grafana/k6-DefinitelyTyped and DefinitelyTyped/DefinitelyTyped repositories by delivering targeted TypeScript enhancements focused on reliability and data fidelity. Developed a sessionExpired event and refined API key management within steam-tradeoffer-manager, improving session lifecycle handling and user notification through robust event handling and API integration. Later, extended the CEconItem data model by adding asset_properties, enabling richer item metadata for downstream systems such as UI and analytics. All changes were implemented in TypeScript with careful attention to type definitions, code quality, and collaborative review, resulting in isolated, maintainable feature additions without introducing new bugs.