Does he/she seem stable and honest? Do they openly admit their mistakes? Do they speak about their lives with both candor and discretion?
Intellectual curiosity is the strongest sign of a sharp, active mind. Formal education should be only the beginning—you need a candidate ready to learn from experience.
Mature people are confident but not arrogant and have a sense of humor, especially about themselves! Look for equal measures of joy and humility.
Before you proceed in the interview process, ask yourself: does your candidate have all 3 of these qualities?
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