For human resources departments, getting through a peak hiring season can feel like running a mental marathon. Without the right preparation, it's easy to fall behind.

From posting jobs and reviewing résumés to making screening calls and sitting in on interviews, the list of to-dos is seemingly infinite. And with no end in sight, it's easy for HR pros to fall into a state of chronic stress. To be sure, new technologies have streamlined the hiring process, but sifting through 100…