I was working on a data quality product for tcs team as a python and pyspark developer. I have worked on individual modules on that and delivered singlehandedly. I have written unittest and documentation for each module i have worked on. 

The project was to generate a report for the bank for all the customer who has account in different country by taking the data from different source systems. The data was so huge so we had implemented hadoop and different hadoop components to perform ETL on the data and generate a xml report out of it.