When it comes to reviewing a resume, former Google recruiter Nolan Church's biggest red flag is wordiness. "The No. 1 thing I don't want to see on a resume is probably text bricks," he says. That is, "endless streams of text that have a lot of words but [not] a lot of content."

These can show up under the bullet points for each job title, for example. While each bullet point should be just one sentence explaining one component of the role, some people will write three to four sentences per bullet, says Church, now the CEO of talent marketplace Continuum. That shows "you have no ability to articulate what you've done quickly," which is critical in this world of constant text communication.