Madeleine Lane enhanced evaluation workflows and data integrity in the arthur-engine repository by delivering targeted frontend improvements using React and TypeScript. She reorganized the Evaluator detail view with a configuration modal and improved the Results page by fixing the Continuous Eval ID filter and increasing the transforms fetch limit, streamlining data retrieval for users. Madeleine also addressed user experience by ensuring form fields in the Add Row dialog cleared after submission, preventing stale data display. To maintain dataset integrity, she implemented logic to add new columns with default values to existing rows, reducing the risk of data loss during schema updates.