The present disclosure generally relates to end-to-end testing of applications using simulated data. More particularly, the present disclosure relates to systems and methods that test applications in a production environment by dynamically generating and tracking the simulated data in real time. In some implementations, an expected number of simulated user profiles (e.g., based on a protocol for generating simulated user profiles) can be compared against an actual number of simulated user profiles stored in a state machine to identify issues within the end-to-end environment of the application being tested.