In the team, when in development phase, a lot of our upstream systems were not ready with their implementation. But we needed some data to test the software that we have built. So, I took some time to understand the contracts that were finalized between the team and created a Simulator application that would mimic as an Upstream system and feed us with the data, so that we can continue our testing properly. I also developed an application to visualize the progress in our system as the data would process to make it easy to understand the flow and to be able to debug a problem.