An extensible platform-as-a-service (PaaS) system for use during the software development lifecycle (SDLC) processes of a user application. The extensible PaaS system receives, from a user, values associated with a user application for features exposed in a presented application programming interface (API) to the user. The system displays a set of software modules for during the SDLC processes of the user application. The system receives a selection of software modules for custom configuration from the user. The system generates a set of custom configured software modules for the received selection of software modules. The system generates a set of automatically configured software modules for the remaining software modules. The system uses the custom configured software modules and the automatically configured software modules during the SDLC processes of the user application.