Ruby has had good ETL libraries for a long time. In my opinion, our product team was too lenient concerning the format of the Excel files. Asking customers to f

Ruby has had good ETL libraries for a long time. In my opinion, our product team was too lenient concerning the format of the Excel files. Asking customers to fill out a template spreadsheet to submit to our system, rather than letting them submit any old XLS file they happen to have on their computer, would have gone a long way towards simplifying the problem space.