Helvetica is a good, albeit somewhat boring, typeface. Like all san-serif typefaces, it has many applications. But I wouldn’t use one for a résumé or any other document that should carry an air of elegance or competence. You want something that looks good at first glance. I’ll paraphrase Matthew Butterick’s two laws of typography from Typography for Lawyers
1. When facing multiple documents, if a reader finds it difficult to make distinctions based on substance, he or she will likely switch to making distinctions based on appearance.
2. Because judgments based on substance require more reader attention, a reader with less time to spend on a document is more likely to make a judgment on appearance.
Thus, for example, if a busy HR person is flipping through a stack of résumés, she is more likely to respond favorably to the ones that are typographically pleasing. And when it comes down to deciding which ones to put in the give-them-a-call pile, there is a significant possibility that—whether consciously or not—she may resort to appearance as a tiebreaker.
As an aside, while Typography for Lawyers
is indeed focused on lawyers as the target market, the vast majority of its content would be equally applicable to other professions and to anyone who has to typographically set their own documents.