1. A computer-implemented method, comprising: receiving first developer inputs authoring markup language code in a user interface (UI) markup file; receiving second developer inputs authoring a compiled language code section in line with the markup language code in the UI markup file, the compiled language code section being delineated from the markup language code by a set of compiled language code identifiers; generating the UI markup file with the markup language code and the compiled language code section in line with the markup language code and delineated from the markup language code by the compiled language code identifiers, in response to the first and second developer inputs; and outputting the UI markup file for compiling at a compile system.