Hiring managers can spot a bad cover letter in under 10 seconds. And in 2026, with AI-generated slop flooding every inbox, a generic cover letter is worse than no cover letter at all.

Here are the seven mistakes that get candidates rejected—and what to do instead.

1. Starting with “I Am Writing to Express My Interest”

This opening line appears in roughly 70% of cover letters. The hiring manager has already stopped reading. They know you’re interested —you applied.

Instead: Open with something specific about the role or company that connects to your experience. “When I saw that your team is building an ML pipeline for real-time fraud detection, I knew my experience leading a similar project at [Company] would be directly relevant.”

2. Repeating Your Resume Bullet by Bullet

Your cover letter is not a prose version of your resume. If you’re listing the same achievements in the same order, you’re wasting the hiring manager’s time and yours.

Instead: Pick 2–3 achievements that are most relevant to this specific role and add context that doesn’t fit in a resume bullet. What was the challenge? Why did your approach work? What was the business impact?

3. Writing More Than One Page

A cover letter should be 250–400 words. Three to four paragraphs. That’s it. Nobody is reading a two-page cover letter, and a long one signals that you can’t communicate concisely—a red flag for any role.

Structure that works:

Opening (2–3 sentences): Why this role, why this company, why you
Body (2–3 bullet points): Your most relevant achievements with metrics
Close (2–3 sentences): Enthusiasm and call to action

4. Being Generic About the Company

“I admire your company’s innovative approach and would love to contribute to your mission.” This could be sent to literally any company. Hiring managers know it, and it tells them you didn’t bother to research them.

Instead: Reference something specific. A recent product launch, a blog post from their engineering team, a company value that resonates with your experience. It takes 5 minutes of research and immediately separates you from 90% of applicants.

5. Using AI-Generated Text Without Editing

Yes, it’s 2026 and everyone uses AI for drafting. Hiring managers know this. The problem isn’t using AI—it’s sending the output without making it sound like you.

Common tells of unedited AI text:

Overly formal language (“I am profoundly enthusiastic”)
Perfect grammar but no personality
Vague achievements without specific numbers
Generic company praise that could apply to anyone

Instead: Use AI as a starting point, then inject your voice. Add specific details only you would know. Replace formal phrasing with how you actually talk. If it sounds like it could have been written about anyone, it needs more of you in it.

6. Not Including Numbers

“I led a successful project that improved efficiency.” Compared to: “I led a 6-person team that reduced deployment time from 4 hours to 12 minutes, saving 200+ engineering hours per month.”

The second one is memorable. The first one is noise. Every cover letter should include at least 2–3 quantified achievements:

Revenue generated or costs saved
Team size managed
Process improvements (time, efficiency, error rate)
Scale of impact (users, transactions, data volume)

7. Forgetting the Call to Action

Many cover letters just… end. They trail off with “Thank you for your consideration.” A cover letter is a sales document, and sales documents need a close.

Instead: Be direct but not pushy. “I’d welcome the chance to discuss how my experience with [specific skill] could support your team’s goals for [specific initiative]. I’m available for a conversation anytime this week or next.”

The Bottom Line

A cover letter is a chance to show personality, context, and fit that a resume can’t. But only if you avoid these seven traps. The best cover letters are short, specific, and sound like a real person wrote them about a real job at a real company.

resumeFORGE generates cover letters alongside tailored resumes—pulling from your actual experience, matching the job description’s language, and keeping it to a tight one-page format with real metrics. You still need to add your personal touch, but the heavy lifting is done.

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resumeFORGE creates cover letters that match the JD and include your real metrics. Free to start.

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Quick Checklist

Opening grabs attention with a specific connection to the role
Body has 2–3 quantified achievements, not a resume repeat
Company research is evident and specific
Length is under 400 words
Tone sounds like you, not a template
Ends with a clear call to action