An IDE is provided by a web browser on a client machine, the IDE having a document editor that allows a user to generate source code. The source code is transmitted from the client machine to one or more servers via a network connection to be compiled into compiled native machine instructions. The compiled native machine instructions are received from the one or more servers by the client machine. The compiled native machine instructions are executed in a sandboxed environment on the client machine, such that system calls originating from the compiled native machine instructions that present a security risk are blocked using the sandboxed environment and system calls originating from the compiled native machine instructions that do not present a security risk are allowed in the sandboxed environment.