A recruiter sees hundreds of cover letters per open role. They scan, not read — typically spending 7 seconds before deciding whether to continue. Most letters are eliminated in the first sentence. Here are the seven mistakes that trigger instant rejection, with better alternatives for each.
Mistake 1: The Dead Opening Line
"I am writing to express my interest in the [Role] position at [Company]." This sentence appears in roughly 60% of cover letters. It says nothing, wastes the recruiter's most valuable 7 seconds, and signals that you couldn't be bothered to write something original.
Instead: Open with a specific, compelling hook. Name the company and role, yes — but lead with why you're the right person or what specifically draws you to this opportunity. "Three years building payment infrastructure at a fintech startup is exactly what prepared me for the Backend Engineer role at Stripe."
Mistake 2: Summarizing Your Resume
Your cover letter is not a paragraph-form version of your resume. Recruiters have your resume. Repeating it adds zero value and wastes their time.
Instead: Use the cover letter to connect the dots. Explain WHY your experience matters for this specific role. Add context your resume can't — why you're leaving, what excites you about this problem, what you'd tackle in the first 90 days.
Mistake 3: Focusing on What You Want
"This role would be a great opportunity for me to grow my skills in X." Hiring managers aren't interviewing you to help you grow — they need someone who will solve their problems. Every sentence focused on what you want is a sentence not spent on what you offer.
Instead: Frame every paragraph around what you bring, deliver, and will accomplish. "What you want" belongs in exactly one sentence — the closing — and even then, it should be framed as mutual value.
Mistake 4: Generic Company "Flattery"
"I have long admired [Company]'s commitment to innovation and excellence." This sentence applies to literally any company. It tells the recruiter you didn't research them.
Instead: Be specific. Reference a product launch, a recent article, a strategy decision, or something about their culture that genuinely resonates with you. Specificity is the difference between flattery and genuine interest.
Mistake 5: No Numbers, No Proof
"I led a successful marketing campaign." Successful how? By what measure? A claim without a number is an opinion.
Instead: Quantify every major achievement. "Led a paid acquisition campaign that reduced CPA by 38% while increasing monthly signups from 2,000 to 5,400." Even rough estimates ("approximately 3x") are better than nothing.
Mistake 6: Wrong Length
Too long (over 400 words): You're asking for more of their time than the role justifies. Too short (under 150 words): You appear uninterested or unprepared. Both extremes signal poor judgment.
Instead: Aim for 250–380 words. Three focused paragraphs. Every sentence should earn its place — if it doesn't advance your candidacy, cut it.
Mistake 7: A Weak or Missing Close
"I hope to hear from you soon." Passive, forgettable, and does nothing to move the process forward.
Instead: Close with a specific, confident call to action. "I'd welcome the chance to walk through how my experience mapping enterprise sales cycles translates directly to the challenges in this role — I'm available for a call any time this week." Confident, specific, action-oriented.
Before sending any cover letter, read only the first sentence aloud. If it could apply to any company or role, rewrite it. The first sentence is the only sentence that matters.