Contact center application creating using reusable program modules

An application development platform transmits to a content provider system instructions that provide a user interface for developing an application that specifies a first multi-step communication flow between a communications device and a communications system. The platform receives from parameters of a program functionality for inclusion in the application, and selects one or more recommended program modules based on the parameters. The platform transmits instructions that provide a user interface for displaying the one or more recommended program modules. The platform receives data indicating a user selection of a particular program module. In response, the platform transmits instructions that provide a user interface for enabling user configuration of the particular program module. The platform receives modified parameters of the particular program module and determines a second multi-step communication flow between the communications device and the communications system based on the first multi-step communication flow and the modified parameters.