In Vietnam, only verified translators can certify a translation. The individual translator can certify their translations, as can an employee of a translation company.
A translator may also certify someone else's translation—as long as the translator has fully reviewed the translation for accuracy and completeness and the translation will not be changed after being certified. That is why translation companies can certify translations provided by their employees or freelance translators.
The certification statement must specify whether the signer has translated or reviewed the translation.