OK sure, there's the appeal of "Smart? Any human is as a lowly slug to the cosmos!" but in the context of a job application it would be dancing around the common use of the word. If the meaning is "I'm probably in the minority of humans who could solve this problem" then it is definitely a good attitude to have in the context of applying for a job.
Now if you say "I'm hardly ever wrong" that won't go over as well.
Now if you say "I'm hardly ever wrong" that won't go over as well.