Recruiters spend an average of 6–7 seconds scanning a resume before deciding whether to read further or move on. That means your entire career story needs to pass a near-instant filter — and most resumes fail it for completely avoidable reasons.
Here are the 10 most common resume mistakes that are silently killing your chances, and the fix for each one.
1. Using one resume for every job
Sending the same generic resume to 50 different companies is one of the most common — and most costly — mistakes job seekers make. Recruiters can tell immediately when a resume has not been tailored to their role.
What to do
Fix: Customise your professional summary and the top bullet points in your most recent role to match the language and priorities of each job description. It takes 10 minutes and dramatically increases your callback rate.
2. Listing duties instead of achievements
"Responsible for managing the sales team" tells a recruiter nothing. Every person with that job title did something similar. What matters is what you actually achieved.
What to do
Fix: Use the formula: Action verb + what you did + the result. Example: "Led a team of 6 account managers, increasing quarterly revenue by 34% through a structured outreach programme."
3. Not quantifying results
Numbers are the fastest way to make an achievement credible. Vague claims like "improved efficiency" or "grew the business" are forgettable. Specific numbers are not.
- Reduced onboarding time from 3 weeks to 5 days
- Managed a £1.2M annual budget
- Grew organic traffic by 180% in 6 months
- Handled 120+ customer queries per day
4. Failing the ATS filter before a human sees it
Most medium and large companies use Applicant Tracking Systems (ATS) to automatically scan and rank resumes before a recruiter ever sees them. If your resume doesn't contain the right keywords, it gets filtered out — regardless of how qualified you are.
What to do
Fix: Read the job description carefully and mirror the exact language it uses. If the JD says "project management" don't just write "leading projects". Use their words.
5. A weak or missing professional summary
The professional summary at the top of your resume is your 30-second pitch. Most people either skip it entirely, or fill it with clichés like "results-driven professional" and "team player".
What to do
Fix: Write 2–3 sentences that describe your experience level, your speciality, and one specific achievement that proves you can do the job. Tailor it to the role you're applying for.
6. Poor formatting that breaks ATS parsing
Fancy tables, columns, headers in text boxes, and graphics look impressive in design tools but confuse most ATS software. The system tries to extract text and fails — often dropping entire sections.
- Use a single-column layout
- Avoid text boxes, tables for layout, and graphics
- Use standard section headings: Work Experience, Education, Skills
- Stick to common fonts: Arial, Calibri, Georgia
7. Including an unprofessional email address
This sounds obvious but it still happens constantly. An email like "cooldude1987@gmail.com" or "partyking@hotmail.com" sends the wrong signal immediately.
What to do
Fix: Create a professional email with a variation of your name: firstname.lastname@gmail.com. It takes two minutes and removes an easy reason to doubt you.
8. Making your resume too long
Unless you have 15+ years of directly relevant experience, a two-page resume is almost always enough. Three or four pages tells a recruiter you don't know how to edit — which is a red flag for any role.
What to do
Fix: Keep it to one page if you have under 8 years of experience. Two pages maximum otherwise. Cut anything that is not directly relevant to the role you're applying for.
9. Outdated or irrelevant experience taking up space
A summer job from 2008 or a role in a completely different industry does not need 5 bullet points on your resume. It takes up space that should be used to sell your most relevant experience.
What to do
Fix: Jobs older than 10 years can be listed with just company, title, and dates — no bullets needed. Anything older than 15 years can usually be removed entirely.
10. Not proofreading
A single typo in a resume signals carelessness. For any role requiring attention to detail, communication skills, or professionalism — which is most roles — a typo can be disqualifying.
What to do
Fix: Read your resume backwards (last word to first) to catch spelling errors your brain would otherwise auto-correct. Then ask one other person to read it.
The bottom line
Most of these mistakes are not about your experience — they're about how your experience is presented. A well-structured, tailored, keyword-optimised resume dramatically improves your chances before a human even reads your name.