Contributed to type safety and API alignment in the DefinitelyTyped/DefinitelyTyped and grafana/k6-DefinitelyTyped repositories by focusing on TypeScript type definitions and API integration. Addressed critical issues by correcting a typo in the BiometricManager interface and updating the Telegram Bot API’s shareMessage parameter to match expected types, improving reliability for TypeScript consumers. Delivered Bot API 9.5 support for the Telegram Web App, enhancing the BottomButton interface with new customization options and aligning documentation for better developer experience. Maintained a PR-driven workflow, emphasizing clear communication and collaboration while leveraging TypeScript and documentation best practices to support maintainers and users.