Examples of secure application development and execution are disclosed herein. An example method may include parsing code of an application configured for execution on a user device to identify one or more sensitive portions of the code. Example methods may further include identifying a trusted execution environment, different from the user device, suitable to execute the one or more sensitive portions of the code. Example methods may further include configuring the code to provide the one or more sensitive portions of the code from the user device to the trusted execution environment during execution of the application on the user device.