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Yes, you can! As well as косячник.

Just a few examples over internet :)

Витя Ну ты и косяк!1 Да еще и конкретный ахаах XD, Мем твое выражение лица -
https://vk.com/kosyaktw

A bit more:

There is a verb derived from it - косячить/накосячить (imperfective/perfective)

You can also call a person косяк, meaning that that person косячит a lot ;)

That's a very colloquial word and it means more like a screw up rather than a simple mistake.