Theoretical arguments about employers’ criteria for ranking workers are abundant. However, the testing of the corresponding hypotheses has often been hampered due to the difficulty of measuring individual job opportunities empirically. This paper attempts to advance this research field by proposing an individual-level and time-dependent measurement of job opportunities based on annual occupation-level job-advertisement data. It yields an indicator of the volume of job opportunities accessible to workers with given occupation-specific credentials and other job-relevant characteristics (i.e., gender, age, work experience). Based on separate regression analyses for men and women, job opportunities for salient groups of labor-market participants and their ranking within the labor queues are assessed. The findings, which differ markedly by gender, show that macro-level processes, such as the economic cycle, play an important role for men's job opportunities in particular. Furthermore, job opportunities strongly depend on occupational credentials whereas educational attainment plays a minor part. Age and cohort effects are found mainly for women. These findings imply that in occupationally segmented and sex-segregated labor markets occupational credentials and sex serve as employers’ primary ranking criteria.