Gōngsī lǐ tā zuò le hǎojǐ nián mǎzǎi cái shēngzhí.
He spent years as a gofer at the company before getting promoted.
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Cantonese-origin slang (馬仔, ma5 zai2), spread to Mandarin via Hong Kong gangster films of the 80s and 90s. Strongly informal and slightly belittling - never use it about a colleague to their face.
