The phrase "in someone's employ" refers to someone who is employed by another person or company. There are many synonyms for this phrase, including "working under", "hired by", "on the payroll of", and "engaged by". Other phrases that could be used in place of "in someone's employ" include "on staff with", "part of the team", and "under contract with". It is important to use a variety of phrases when referring to someone's employment status to avoid repetition and add nuance to your writing or speech. Whether you are writing a cover letter or speaking with a colleague, using different synonyms for "in someone's employ" will make your language more interesting and engaging.