Do you have to do the hardware also? What kind of servo? R/C type or real servo, what size stepper? Do you have to do the stepper drive or just send step/dir signals? What are the outputs? Just set and clear a pin or is something connected to the pin?

All of the above are great suggestions, but really more information is needed to "point you in the right direction". Is this a job interview or a project for a job? The requirements are a bit strange.