Most lists of resume mistakes are padded with things that do not matter much — a photo, an objective statement, the word "references available on request". Those are minor. The faults that genuinely cost interviews are duller and more structural, and they show up in the large majority of CVs that get rejected. Here they are, roughly in order of how much damage each one does.
1. Responsibilities where outcomes should be
This is the most common serious fault, and it is nearly universal. A bullet that reads "Responsible for managing the social media accounts" describes the job description you were given, not what you did with it. Every person who held that title could write the same line, which means it distinguishes you from nobody.
The fix: for each bullet, ask what changed because you were the one doing it. Then state the change. "Responsible for managing social media" becomes "Grew organic social referrals from 4% to 11% of signups over eight months by shifting posting cadence and rebuilding the content calendar around product launches."
If you genuinely cannot recall a number, state the outcome qualitatively and specifically rather than reaching for a fake one. "Rebuilt the content calendar around product launches, which became the team's standard approach for subsequent releases" is honest and still says something.
2. Numbers you cannot defend
The overcorrection to the fault above is worse than the fault. Inventing "increased efficiency by 40%" because the advice said to use metrics creates the single worst interview topic available to you, because interviewers probe numbers precisely because numbers are checkable. Being unable to explain where your own figure came from ends the conversation.
The fix: use only numbers you could walk someone through. Where a number would help but you do not have it, an honest range or a scale indicator works: "a team of six", "across roughly 200 stores", "the second-largest of our four regions". Scale is a metric even when magnitude is not.
3. Relevance buried below the fold
A recruiter's first pass over a CV is very fast — the widely cited figure is six to eight seconds, and while the precise number varies by study, the finding that the first scan is brief and pattern-based is robust. In that time, attention goes to your most recent title, your current employer, your dates, and whether the top of the page signals relevance to the role in front of them.
If the thing that makes you a strong candidate for this specific job is in the fourth bullet of your second role, it will not be found.
The fix: treat the top third of page one as the only guaranteed real estate. A two-line summary that states your specialisation and level, followed immediately by your most recent role with its strongest bullets first. Order bullets within each role by relevance to the job you are applying for, not chronologically or by how proud you are of them.
4. Formatting that breaks the parse
Contact details in a document header that parsers do not read. Two-column layouts built with tables that get read across rather than down. Skills shown as rating bars with no underlying text. Any of these can corrupt the structured record built from your file, and the failure is silent.
The fix: select all in your PDF, copy, and paste into a plain text editor. If that plain text version reads correctly in order and contains your phone number, you are fine. If it does not, fix the structure before anything else — there is no value in polishing bullets that arrive scrambled.
5. One CV sent everywhere
The same document sent to forty postings will be a poor match for most of them, because job descriptions in the same nominal role differ substantially in what they emphasise. A CV optimised for none of them is competing against CVs optimised for each.
The fix: tailoring does not mean rewriting. It means a focused edit of three things — the summary line, the skills section, and the ordering and wording of four or five bullets — to match the vocabulary and priorities of the specific posting. Fifteen minutes per application, applied to fewer applications, beats forty untailored sends.
6. Vocabulary that does not match how recruiters search
If a posting says "Kubernetes" and your CV says "container orchestration", a keyword search will not surface you. This is not because a robot is scoring you down; it is because recruiters search their applicant database by keyword and work through the results, and you are not in the result set.
The fix: name the specific technologies, tools, methodologies and certifications the posting names, in the same words, wherever they are genuinely true of your experience. Write both forms where both are used in your field: "container orchestration (Kubernetes)".
This is not permission to stuff keywords. Hidden white text and irrelevant skill lists are transparent to the human who eventually reads the document, and they read as manipulation.
7. Unexplained gaps and vague dates
Employment gaps are common and rarely disqualifying. What creates suspicion is trying to obscure one — dropping months and showing only years so a fourteen-month gap looks like a seamless transition. Recruiters notice this pattern, and having noticed it, they now wonder what else is being smoothed over.
The fix: use consistent month-and-year dates throughout, and give a gap a one-line factual explanation where it helps: "Career break — full-time caregiving" or "Sabbatical, travel". Stated plainly, it stops being a question.
8. Length that does not match your experience
A three-page CV from someone with four years of experience signals an inability to prioritise. A one-page CV from someone with eighteen years signals that most of the relevant evidence has been cut. Neither is fatal, and both are easy to get right.
The fix: roughly one page up to about ten years, two pages beyond that. Older roles compress to a title, employer and dates. Nothing before about fifteen years back needs bullets at all unless it is unusually relevant.
Where to start
Fix them in order. The parse first, because everything else depends on it. Then relevance and ordering, because that is what the six-second scan sees. Then the bullets themselves, which is the slowest work and the one most people start with.
If you want the specific list for your own CV rather than the general one, the free checker reports which of these are present in your document and where.