1. A computer-implemented method of executing an enterprise application comprising: receiving, by a computer, an external request for a service provided by a runtime engine of the enterprise application; selecting, by a computer, a script from a plurality of scripts saved on a database based on the external request; referencing, by the computer, one or more tags stored in a tag library saved on the database that are called by the script, wherein the tags in the tag library define commands of the plurality of scripts and call one or more granular services of the enterprise application; loading, by a computer, the selected script and the tags referenced by the selected script; and executing, by a computer, instructions of the script to provide the service requested by the external request, wherein the selected script is updated in the database after executing instructions of the script.