Disclosed herein are devices, systems and methods for securely accessing data transferred via multiple isolated networks network, comprising adjusting one or more mapping records comprising network mapping and routing settings for a plurality of isolated networks connecting a plurality of clients to a server to expose one of the plurality of isolated networks to one or more processing engines executed by the server while concealing all other isolated networks from the respective processing engine, activating a lock configured to enable each processing engines to execute a single thread, executing the processing engine(s) to fetch data from the exposed isolated network(s), and releasing the lock. Wherein each processing engine is able to access the isolated network exposed to the respective processing engine while unable to access any of the isolated networks concealed from respective processing engine.