Establishing and maintaining an improved single sign-on (SSO) facility

A client system associated with a user includes at least one hardware processor configured to initiate the following operations. A modified login page is received from a proxy hardware system. An asynchronous engine is loaded by a browser system executing on the client system and caused by a routine from the modified login page. A login process with an authentication profiling service is executed, using the asynchronous engine, to retrieve login information for a back-end server. The authentication process with the back-end server is completed using the asynchronous engine. The modified logic page is generated by the proxy hardware system by adding the routine to a login page being sent from the back-end server to the browser.