Worked on the ex-em/EVUI repository to enhance chart accuracy by fixing label positioning logic in JavaScript-based front end code. Addressed a bug where chart labels did not account for data visibility, ensuring that labels are now calculated only for visible series containing data. This adjustment reduces the risk of misinterpretation when some chart series are hidden or lack data. The solution involved updating both the core charting logic and related interaction plugin comments to clarify the new data-aware approach. The work emphasized maintainability and traceability, with focused commits and clear documentation, leveraging skills in JavaScript and charting libraries throughout.