The present disclosure includes techniques pertaining to computer implemented systems and methods for transforming data. In one embodiment, data sources are specified by a user and copies of specified data are received in local storage. Data is presented to the user as a spreadsheet of columns and rows and the user manipulates the data in the spreadsheet. The user manipulations are automatically translated into data flow objects and a data flow graph, which is executed to transform the data. The modified data is presented to the user.