Tā zài gōngsī lǐ chūcì xiàn tóujiǎo, jiē le ge dà dānzi.
At the company he first showed his stripes by landing a big account.
Tips
usage
见 here is read xiàn with the classical sense "to appear; to show" (same as 现). Synonymous with 露头角; both evoke young horns just becoming visible on a growing animal.