Federico Silva enhanced the wazuh-dashboard repository by improving the testability of the query editor’s language selector. He introduced a stable automated selector by adding a data-test-subj attribute, specifically 'queryEditorLanguageOptions', to the EuiPopover component within the language_selector.tsx file. This adjustment enables more reliable end-to-end and UI testing, reducing test flakiness and accelerating continuous integration feedback cycles. Federico’s work focused on front end development using React and TypeScript, applying testability patterns with data attributes. Over the month, he delivered this targeted feature without addressing bug fixes, demonstrating depth in automated testing and component-level engineering for maintainable workflows.