Nicolas Oudard worked on data quality exploration for the incubateur-ademe/quefairedemesobjets repository, focusing on improving data type normalization during data downloads. Using Python and leveraging data engineering and ETL skills, he implemented a feature to cast all columns to strings, aiming to simplify downstream processing and ensure consistency. He also developed a refinement to format postal codes by padding leading zeros for codes under 10000, enhancing lookup accuracy. Although these changes were ultimately reverted to maintain existing data contracts, Nicolas thoroughly documented the process and outlined next steps for a safer, incremental rollout, demonstrating thoughtful, process-driven engineering depth.