For example, I want to search all entry-level software engineer jobs in a particular city. If would be really nice to be able to filter my job search by career level. No sense in sifting through a bunch of jobs that I'm unqualified for as a recent graduate. You could simply have a drop down menu which would be optional in the search.
I agree that this would be a nice feature, however it's very difficult for either the employer or the candidates to quantify the different levels. Is "intermediate" at least 3 years of experience or 4? What's the cutoff?
I was going to counterpropose searching by years of experience, but even that is difficult to build in, because employers may need multiple different levels of experience for the same job -- this can't really be aggregated into a meaningful single number.
You just have to bite the bullet and read each job description. Besides, only you can know what is and isn't a good fit for you. If you keep up with it, you'll only have to read the new ones, and (soon) favourite the ones you're interested in.