The web application was created "pro bono" in 2017, when I was a member of the ".Nowoczesna" political party. Its task was to estimate the possible number of seats in parliament in future parliamentary elections. The calculations were made on the basis of the electoral law and the actual voting results in the previous elections. A significant problem was converting data from Excel spreadsheets to MySQL database. The application was hosted in the Google cloud. The access to the app was limited to the ones who had a login from the party leadership.