Nickle LaMoreaux, IBM's chief human resources officer, has helped hire thousands of job candidates since joining the tech giant more than 20 years ago. While there's no such thing as the perfect interview, she recalls one applicant who came pretty close — and it was thanks to an act as simple as sending a thoughtful follow-up email with proof of their recent work.

As LaMoreaux remembers, she interviewed the candidate right before IBM released its annual earnings report. While the candidate was "articulate" and "well-prepared" for their meeting, the hiring committee was still considering several applicants in their search.