Data applications may be developed within an integrated development environment comprising an iterative cycle of writing source code, building the source code, running the data application, and testing the data application. The development becomes iterative because the application is torn down, redesigned, rebuilt, and re-executed if the data application is modified. Developing an application at runtime is disclosed herein, which is generally more efficient than conventional iterative techniques. As provided herein, runtime application comprising prebuilt components is presented to a user. The runtime application may be modified through modification gestures. An update assembly may be built based upon the modification gestures. The runtime application may be updated based upon the updated assembly. For example, prebuilt components modified by modification gestures may be torn down, updated with a corresponding update assembly, and reloaded into the runtime application, while the runtime application is in a runtime state.