It would be nice to have the ability to Save (or "Favorite") job postings. For example, if I want to apply to them later rather than right now, I could save it and it would make it easier to find when I come back later. See example from Indeed attached.
Additionally, you could potentially use the data about which jobs I save to personalize my future searches, by placing jobs with similar characteristics towards the top of the search results. (This part isn't an important feature, just an idea.)