Recruiters spend seconds on each CV in the first pass, and most of that time is spent looking for reasons to say no. Red flags are the shortcuts they use to thin a large pile fast. Knowing what trips the filter lets you fix problems before they cost you an interview you would otherwise have earned.
Unexplained gaps and vague timelines
A gap in your work history is not automatically a problem, but an unexplained one invites the wrong assumptions. Recruiters notice missing years, and when the dates are fuzzy or only list years instead of months, they wonder what is being hidden.
The fix is rarely to hide the gap. Account for it briefly and honestly: a sabbatical, caregiving, study, a deliberate break. A short, confident line closes the question. Vagueness keeps it open, and an open question in a recruiter's mind usually ends in a pass.
Job-hopping without a story
A series of short stints raises a fair question: will this person leave us too? One or two short roles are normal, especially early on or in contract-heavy fields. A long pattern of leaving every several months needs context.
If your history looks jumpy, give the reader a reason. Note contract roles as contracts, group related short engagements, and let your achievements show you delivered value even in brief tenures. The flag is not the short stay; it is the unexplained one.
Responsibilities with no results
A CV that lists only duties reads as a job description, not an achievement record. Recruiters see "responsible for managing social media" and learn nothing about whether you were any good at it.
Replace duties with outcomes wherever you can. Numbers help: growth, savings, time reduced, problems solved. A CV full of "responsible for" lines signals someone who occupied a role rather than someone who moved the needle in it.
Sloppiness and errors
Typos, inconsistent formatting, and mismatched dates are small things that carry an outsized signal. For roles where attention to detail matters, and that is most of them, a careless CV suggests careless work. Recruiters use this as a cheap, fast filter precisely because it is easy to spot.
Proofread, then have someone else proofread. Keep formatting consistent: one date format, aligned headings, uniform bullet style. A clean document earns the benefit of the doubt; a messy one loses it.
Generic, one-size-fits-all CVs
A CV that was clearly written for no role in particular is a quiet red flag. When nothing on the page speaks to the job at hand, a recruiter reads it as low effort or a scattergun application.
Tailoring fixes this fast. Mirror the language of the posting, foreground the relevant experience, and trim what does not serve this specific role. If you keep one well-maintained master CV, a tool like Postulit can help you build that base from your profile, and you then tailor a copy for each application. Most red flags are not about being underqualified. They are about looking careless, evasive, or generic, and all three are fixable before you hit send.