What is the direct translation of “잘했어요”?
Quite literally it is “X did well.” 잘: well 하다: to do 동사 어근 + 었/았/였 (였 in this case): the past tense
Normally, you say it to someone like the phrase “good job,” “nice work,” or “well done.”
You’d have to get the exact person/number from the context.