1. A computer-implemented method performed by a computing device where the computing device includes at least a processor for executing instructions from a memory, the method comprising: identifying a selected runtime environment to execute an analytical model that includes analytical expressions; generating a user-script data structure, wherein the user-script data structure includes instructions for mapping the analytical expressions of the analytical model to executable expressions of the selected runtime environment based on a runtime specification of the selected runtime environment; generating a computerized specification object, wherein the computerized specification object includes: (i) a pre-script data structure specifying how the selected runtime environment is to access input data to be operated upon by the analytical model, (ii) the user-script data structure and the analytical model, and (iii) a post-script data structure specifying how to output results data produced by the analytical model from the selected runtime environment; transmitting the computerized specification object over a computer network to the selected runtime environment for execution of the analytical model by the selected runtime environment, wherein access is provided to a configuration file specifying a designation of a hardware execution configuration of selected nodes that are to be instructed to execute the analytical model, wherein the selected nodes are selected from a plurality of available nodes of the selected runtime environment; and receiving results data from the selected runtime environment.