Worked on the tkajtoch/kibana repository to enhance the reliability of Discover visualizations and improve test stability within the codebase. Addressed rendering errors by introducing a data view configuration validation step before rendering the UnifiedHistogram, which prevented failures when integrating with the Lens embeddable. Improved the stability of UnifiedDataTable tests by adopting the waitFor utility from @testing-library/react, ensuring asynchronous operations completed before assertions. These changes led to the re-enablement of the Discover-Lens functional test suite, resulting in more predictable releases. Utilized JavaScript, TypeScript, and React testing methodologies to deliver robust frontend solutions and maintainable test coverage.