3. Apply to old job postingsJust because an ad is 30 days old doesn't mean it's been filled. Positions may take from two weeks to three months to fill. So, when a job is 30 days old, or even older, send in your resume. There is a very good chance that you will be one of the very few to have applied that day (compared with the hundreds of resumes that are submitted on the first few days of a job posting). Also, don't forget that firms tend to have the "same types" of position openings ... so even if it's 30 days old, perhaps the firm is thinking of opening a new position that is similar, and then "voilá" - your resume appears.