Chelvan worked on the DS4SD/docling repository, focusing on backend development and performance optimization for Excel file processing. They delivered a feature that refactored the MsExcel backend’s _find_table_bounds function, replacing Worksheet.cell with iter_rows and iter_cols to accelerate data ingestion. This approach improved throughput by streamlining how Excel tables are parsed, particularly addressing the handling of merged cells and ensuring correct 1-based indexing in openpyxl. Using Python, Chelvan’s work targeted the efficiency of Excel processing pipelines. The depth of the contribution lay in both the technical refactoring and the careful attention to edge cases in Excel data structures.