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Cover Letter Guide: When It Matters and How to Write One
Most cover letters fail because they restate the resume in paragraph form. A useful one does something the resume structurally cannot. Here is what that is, when it is worth the effort, and how to write one in under 300 words.
What a Cover Letter Is For
A resume is a structured record. It is very good at showing what you did and how much of it, and structurally incapable of explaining why. It cannot tell someone why you are applying to this company specifically, why you left an industry, why a two-year gap exists, or why a candidate with an unusual background is the right risk.
That gap is the cover letter’s entire job. Anything in your letter that your resume already communicates is wasted space, which is why the most common cover letter — a prose summary of the attached resume — persuades nobody.
When It Actually Matters
- Career changes — where the connection between your history and the role is not self-evident.
- Employment gaps — where a brief, unembarrassed explanation removes a question mark.
- Smaller companies — where a founder or hiring manager reads every application personally.
- Competitive roles — where dozens of candidates have comparable resumes and something has to break the tie.
- Relocation — where an employer needs to know you are serious about moving, not speculatively applying.
When a posting explicitly requests one, it is not optional. Skipping it is often read as an inability to follow instructions before anyone assesses your fit.
A Structure That Works
- Opening (2-3 sentences): the role you want and the single most relevant thing about you. No throat-clearing.
- Middle (1-2 paragraphs): one specific example connecting your experience to their stated need. This is the whole letter.
- Why them (2-3 sentences): something specific about the company that could not be copy-pasted to a competitor.
- Close (1-2 sentences): a plain statement of interest. No elaborate sign-off.
Before and After: The Opening
Before (says nothing, could be any applicant)
“I am writing to express my strong interest in the Marketing Manager position advertised on your website. I believe my skills and experience make me an excellent candidate for this role.”
After (specific, earns the next paragraph)
“Your posting mentions rebuilding demand generation from scratch after a pivot. I did exactly that at a Series B SaaS company last year, taking pipeline from $0 to $4M in 18 months — and I would like to do it again here.”
The second version proves in two sentences that the writer read the posting and has done the specific thing being asked for. Nothing else in the letter needs to work as hard.
Common Mistakes
- Restating the resume in prose. The reader already has the resume. Duplicating it wastes the one chance to add something.
- Writing about what you want from them. “This role would help me grow” centers you rather than the problem they are hiring to solve.
- Generic praise of the company. “Your commitment to innovation” could be pasted into any letter to any employer and means nothing.
- Excessive length. Past one page it stops being read, which makes the extra words worse than useless.
- Apologizing for gaps in experience. Naming a weakness and then arguing against yourself does the reader’s screening for them.
The Only Test That Matters
Read your letter and ask whether it could be sent to a different company for a different role with only the names changed. If yes, it is a template, and it will be read as one. At least one paragraph should be impossible to reuse anywhere else.
Frequently Asked Questions
Does anyone actually read cover letters?
Sometimes. Many recruiters skip them for high-volume roles, but hiring managers frequently read them for competitive positions, smaller companies, and any role where fit is ambiguous. The asymmetry favors writing one: rarely penalized for including it, occasionally decisive.
How long should a cover letter be?
Three to four short paragraphs, under 300 words, on one page. A cover letter that runs the length of a resume will not be read, and length is not what makes it persuasive.
Should I write a new one for every application?
The middle should change every time, since it is where you connect your specific experience to their specific need. The structure and closing can stay stable. A cover letter that could be sent anywhere persuades nowhere.
What if I cannot find the hiring manager's name?
'Dear Hiring Team' or 'Dear [Department] Team' is perfectly acceptable and better than a wrong name. Avoid 'To Whom It May Concern', which reads as a template nobody adapted.
Can AI write my cover letter?
It can draft the structure and get you past the blank page, which is the hardest part. But an unedited AI cover letter reads like every other one, so the specific detail about why this role and this company has to come from you.