Worked on the porscheinformatik/clarity-addons repository to deliver TreeTable filtering and rendering enhancements using Angular and TypeScript. Developed recursive rendering and advanced state management for selection and filtering, introducing an internal tree representation to optimize performance with large datasets. Refactored the ClrTreetableDataStateService to streamline state emissions and reduce unnecessary updates, while expanding test coverage to improve reliability and CI stability. Addressed edge cases in rendering and selection, fixed CSS and animation issues, and added a pre-order traversal generator for descendant nodes. Comprehensive documentation updates accompanied these changes, resulting in improved maintainability and faster insights for users handling complex tree data.