rise from the ranks
To reach a prominent position after serving in subordinate ones. The employees trust Stu as their manager because they know that he rose from the ranks from the same entry-level position that they have now. The only way you'll rise from the ranks here is by putting in enough time and hard work.
rise from the ranks
Fig. to achieve position or office, having worked up from the masses. He rose from the ranks to become president of the company. Most of the officers of the company have risen from the ranks.