I'll engage in John's behavior if you decide to employ him.

如果你决定聘用约翰，我愿为他的行为担保。

youdao

I'll engage for John's behaviour should you decide to employ him.

如果你决定聘用约翰，我愿为他的行为担保。

《新英汉大辞典》

If what we've outlined here sounds like the approach a management consultant would employ, that's because consultants have long needed to engage in provocation-based selling.

如果我们在此罗列的东西看起来像管理咨询师将要采用的方法，那是因为他们早就需要煽动式销售法了。

youdao

While many brands already employ games and entertainment apps to engage customers, the healthcare sector has recently applied game mechanics to address bigger issues than human boredom.

FORBES: Gaming Your Way To Better Health

States not only employ some 4.7m people directly, but engage in a range of activities from waste-disposal to the provision of social services to business regulation covered by federal legislation.

ECONOMIST: The Supreme Court