Learn Russian: Разве менеджеру не хватает компетенции для этой должности? - Does the manager really lack the competence for this position?

This uses the impersonal construction хватать / хватить (to suffice/be enough). The person experiencing the lack is in the dative case (менеджеру), and the thing that is lacking is in the genitive case (компетенции). Literally, the sentence is structured as 'Is there not enough of competence to the manager?'

What exact nuance does the word разве add to this question?

Разве adds a strong sense of doubt, surprise, or disbelief. By asking Разве ... не ...?, the speaker is essentially saying, 'Is it really true that he lacks it? I thought he was competent.' It expects reassurance or clarification rather than just a simple yes or no.

The nominative form of competence is компетенция. Why does its genitive form end in -ии rather than just changing the last letter?

Feminine nouns ending in -ия (like компетенция, история, лекция) have a special spelling rule. In the genitive, dative, and prepositional cases, they end in -ии. This is why we write компетенции instead of компетенци.

Could we use the perfective verb не хватит here instead of the imperfective не хватает?