The tech resume mistakes that cost people interviews are almost never about formatting. They are about evidence. A resume that lists tools without saying what you did with them, or describes duties instead of outcomes, gets filtered out before a human reads it closely — no matter how clean the layout is.
Here are the eleven that show up most often, and what to write instead.
1. Listing Tools With No Context
A wall of technology names tells a reader nothing about depth. “Windows Server, Active Directory, Linux, Python, AWS, Docker, PowerShell” could describe someone who has run all of them in production or someone who watched a video on each.
Fix it by attaching tools to actions wherever they appear in your experience or project sections. “Automated user onboarding in Active Directory with PowerShell, cutting a fifteen-step manual process to one script” says more than six tool names in a row.
Keep a short skills block for keyword coverage. Do the real work in the bullets.
2. Describing Duties Instead of Work
“Responsible for the ticket queue” is a job description. “Worked a shared queue of roughly forty daily tickets covering account lockouts, Windows imaging and VPN faults, and wrote six runbooks that reduced repeat escalations” is a resume bullet.
The pattern: what you did, what you did it with, and what changed as a result. If you genuinely cannot measure the result, describe the scope — how many users, how many sites, how many systems.
Never invent a number. A fabricated metric is the single fastest way to fail a reference check or an interview follow-up.
3. Hiding the Home Lab
Career changers and new entrants treat self-directed projects as embarrassing. Hiring managers for junior roles treat them as the main evidence available.
Give the lab its own Projects section, above or alongside experience. For each project write three lines: what you built, what technologies were involved, and what you learned by breaking it.
| Weak version | Strong version |
|---|---|
| “Home lab experience” | “Built a two-client Windows domain on a bare-metal hypervisor with AD, DHCP and internal DNS; documented twelve fault scenarios and resolution steps” |
| “Familiar with Linux” | “Ran a Linux web and database host with static addressing, SSH key auth and nightly backups; restored from backup twice to verify the process” |
| “Learning networking” | “Segmented the lab into corporate and guest networks behind a software firewall and wrote the rule set permitting only outbound guest traffic” |
4. Misstating Certifications
This one gets people removed from consideration outright. Three rules:
- List only credentials you have actually been awarded, with the awarding body and the year.
- If you are studying, label it plainly — “CompTIA Network+ — exam booked for March” sits comfortably under an “In progress” heading.
- Name the owner correctly. These credentials belong to CompTIA, Cisco, Microsoft, ISC2, AWS and other third parties. A training provider prepares you for an exam; it does not award the credential, and writing it as though it did looks either careless or dishonest.
Also check whether an advanced credential you are claiming has documented experience requirements. Several do, and claiming the full credential when you have only passed the exam is a correctable error that reads badly if a recruiter catches it.
5. Burying the Relevant Experience
If you are moving into IT from another field, a strictly reverse-chronological resume puts your most relevant material at the bottom of page one or on page two.
Lead with a short summary naming the role you are targeting. Then Projects. Then Certifications. Then work history. Your retail or warehouse or hospitality history still belongs there — it shows reliability and progression — but written in terms a technical reader recognises: triage, escalation, inventory systems, point-of-sale troubleshooting, shift documentation.
6. Writing One Resume for Every Posting
Automated screening and human screening both work by matching language. If a posting says “Intune, Entra ID, Windows 11, ticket queue” and your resume says “mobile device management, cloud identity, desktop operating systems, service desk”, a keyword match may never happen.
You do not need eleven resumes. Keep one master and adjust the summary line, the skills block, and the order of your bullets for each application. Fifteen minutes per posting, and only using words that are actually true of you.
7. Formatting That Breaks Parsers
Design flourishes cause avoidable damage when a system converts your file to text.
- No tables, text boxes, columns or graphics in the body
- Standard section headings — Experience, Skills, Projects, Education, Certifications
- A common font, black text, left-aligned
- Dates in a consistent format on every entry
- Submit as PDF unless the posting asks for something else
- Name the file sensibly: lastname-firstname-resume.pdf
Keep it to one page early in your career, two once you have several years of relevant work.
8. No Link to Anything
A resume is a claim. A link is evidence. A public repository with your lab scripts and documentation, or a simple site with your project write-ups, lets an interested reader verify you in ninety seconds.
Put the link in the header next to your email. Make sure it actually loads, that the latest commit is not two years old, and that the README explains what someone is looking at.
9. Skipping the Cover Note When There Is a Gap to Explain
For a straightforward application, skip it. For a career change, a visible employment gap, or a relocation, three short paragraphs do real work: why this field, what you have built, what you are applying for.
Specific beats passionate. “I have spent the last six months running a Windows domain and a Linux host in a home lab, and I have Network+ booked for March” lands far better than a paragraph about a lifelong love of technology.
10. Applying Only to Perfect Matches
Entry-level postings routinely list requirements the employer will happily waive for a candidate who shows method and evidence. If you meet most of the core requirements, apply.
The corollary: do not scatter applications across roles you have no business in. A tracked list of forty relevant employers, worked deliberately, beats three hundred one-click applications.
11. Not Preparing for the Obvious Questions
Your resume sets the questions. Every project and bullet on it should have a two-minute spoken answer behind it, practised out loud.
Expect these:
- Walk me through something that broke and how you fixed it.
- What is DNS and what happens when it fails?
- How do you approach a problem you have never seen before?
- Tell me about the lab on your resume.
- What are you studying right now and why that?
Answer with the sequence you followed, not just the outcome. Interviewers for support and operations roles are listening for method.
A Five-Minute Audit
Run your current resume through this before your next application.
- Every tool named is attached to something I did with it
- Every bullet has an outcome or a scope
- Projects section exists and is specific
- Certifications list awarding bodies and years, with in-progress items labelled
- Target role appears in the summary line
- Posting language appears where it is true
- No tables, columns or graphics in the body
- Link to a repository or site, and it loads
- One page, PDF, sensibly named
- I can speak for two minutes on every line
Evidence Over Adjectives
Hiring managers for junior tech roles are not looking for polish. They are looking for signs that you can diagnose something, document it, and not need supervising twice for the same problem. A resume full of specific, true, verifiable work does that. A resume full of adjectives does not.
To build the projects that make those bullets writable, start with the IT Ops course category on Tech Skills Library and pick the track closest to the role you are targeting.