1. A method comprising: in response to receiving an initial user input that causes a builder computing system to assemble a set of resources into a set of uncompiled targets of an application package that implements an application, deploying, by the builder computing system, the application package to initiate execution of the application, wherein the set of uncompiled targets includes a subset of the set of resources; after modification to at least the subset of the set of resources, receiving, at the builder computing system, a subsequent user input that causes the builder computing system to assemble an updated subset of the set of resources that are based on the subset of the set of resources; and deploying the updated subset of the set of resources to update the application based on the updated subset without sending another application package that includes the updated subset of the set of resources.