Worst for me was for Rakuten when they asked to basically implement a complete ETL pipeline to populate a mini-datawarehouse. It was easily more than a week's w

Worst for me was for Rakuten when they asked to basically implement a complete ETL pipeline to populate a mini-datawarehouse. It was easily more than a week's worth of 2 hours per day work that was supposed to be done within a week and worse, they didn't even bother to provide feedback.