Abstract: Provided is a process of compiling user instructions into a JavaScript program, the process including: obtaining a library comprising a plurality of subroutines having a standardized interface and encoded in a human-readable format; obtaining a decision tree, the decision tree containing a declarative representation of business logic to be implemented in a human-readable JavaScript program to be executed server-side in a client-server architecture, the decision tree identifying at least a plurality of the subroutines in the library to be used in the JavaScript program; and compiling the decision tree and the plurality of subroutines into the JavaScript program, wherein compiling comprises: crawling the decision tree and identifying the subroutines; parsing the one or more instructions executed to perform the tasks of the identified subroutines from the respective standardized interface of the identified subroutines; and adding at least part of the parsed instructions to a text representation of the JavaScript