1. A method for masking data in a software application associated with a mobile computing device, the method comprising: receiving, by one or more computer processors, a request to display data in a software application on a mobile computing device; determining, by the one or more computer processors, whether one or more masking rules apply to the data, wherein determining whether one or more masking rules apply to the data is performed by an instrumentation of application binary of the software application; and responsive to determining that one or more masking rules apply to the data, masking, by the one or more computer processors, based on the one or more masking rules, the data, wherein masking is performed by the instrumentation of application binary of a screenwriting application programming interface of the software application.