An approach is provided for automatically deploying an information technology (IT) system instance having hardware and software components. Based on components consisting of system context diagrams, component models, operational models, data flow diagrams, and use cases describing functional requirements of the IT system instance, an application model of the software components is generated. Based on the application model and the use cases, an infrastructure model of infrastructure components is generated. Based on the application model and the infrastructure model, a computer file in a markup language is generated. The computer file includes a design of the IT system instance and instructions for accessing library-stored assets specifying the hardware and software components. The computer file is exported to a deployment tool for an automatic deployment of the IT system instance based on carrying out the instructions to access the assets.