Use the word raffishly to describe anything that's done in a careless, mischievous way that still manages to be charming.

What does Raffishly mean?

1 : marked by or suggestive of flashy vulgarity or crudeness. 2 : marked by a careless unconventionality : rakish.

What can I say instead of responsible for?

You can say “spearheaded” or “implemented” instead of “responsible for” on a resume. “Spearheaded” and “implemented” are examples of resume action verbs, and are descriptive substitutes for the words “responsible for.”