Which is the correct use of comparison? I'm at least as qualified as, if not more than, the other candidate.

I'm as at least qualified as, if not more than, the other candidate.

I'm at least as qualified, if not more than, the other candidate.

I'm at least as qualified as, if not more than, the other candidate.

None of these

"I'm at least as qualified as, if not more than, the other candidate."

"At least as qualified as" is a standard comparative construction.

"If not more than" adds the nuance that you might actually be more qualified.

The sentence flows logically and grammatically.