This is a simplified version of a time-off request app I built to increase the efficiency, dependability and ease around asking and being approved for time off at my job.
As you can see, it's an Expressjs REST service (connected to a Mongodb instance) called by a hand-coded client (using bootstrap, jquery, momentjs and a datetimepicker). For the sake of ease and simplicity I've side-stepped authentication in this version.
##Please play with it here.
You can sign in as an employee, request time off, then switch over to the supervisor interface to approve or deny it.