I am trying to add an application to my site where I can post job openings with my company and allow people to apply online.

Can someone recommend a service or app already in existence for this purpose?

I tried googling it, but could not find a set of search terms that did not return endless sites for job seekers.

This is a (very) small business and I do not expect to have more than a few openings at any time, but what I am actually interested in is having a repository of interested job seekers to have on file. Then when people ask me about openings, I could just refer them to the page and they could apply. Then, if we have an opening, we could look through the list of candidates and if we can't fill the position(s) from that list, we could post the job and advertise to fill the position.