Abstract: The subject invention pertains to systems and methods to provide rich and intelligent programmatic assistance across language and compilation boundaries. In essence, the systems and methods can monitor a plurality of compilation units in a software project to determine the language(s) employed therewith and provide intelligent code assistance to the compilation units for the detected language(s). The rich and intelligent assistance can correspond to providing code suggestions, among other things, based on the programming language being utilized and the context of its use. In brief, the herein disclosed techniques provide a seamless design environment to facilitate coding in multiple programming languages amongst a plurality of compilation units in project.