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A cover letter earns its place when it says something the resume cannot: why this company, what you understood about the problem they're hiring against, and what you would do in the first month. Most letters fail because they restate the resume in longer sentences.
Length is where people lose the reader. Somewhere between 250 and 350 words is enough to make one specific argument well. Past that, the reader starts skimming and the specifics you worked hardest on disappear into the middle paragraphs.
Write the opening paragraph last. It's much easier to open well once you know what your argument actually turned out to be.
The tools
A structure that holds up
Open with the specific reason you're writing to this company rather than a summary of yourself. Second paragraph, the single strongest piece of evidence that you can do the work, ideally the same achievement your resume lists but with the context the bullet had no room for. Third, what you'd want to understand or work on first. Close with one line and your name.
That's four short paragraphs and it's enough. The instinct to add a fifth is almost always the instinct to restate something you already said.
When a cover letter is worth writing
When it's optional and you have something specific to say, write it. When it's optional and you'd be producing filler, skip it and put the time into tailoring your resume instead, which has a larger effect. When it's required, treat the requirement as a filter: plenty of applicants will submit something generic, so a letter with one concrete, verifiable claim in it stands out cheaply.
Career changers get the most out of cover letters, because a resume alone rarely explains why the switch makes sense. That explanation is exactly the thing the format is good at.
Things that quietly cost you
Addressing it to the wrong company is more common than you'd think and is fatal, so check the name before sending if you reused a draft. Beyond that: opening with "I am writing to apply for", listing adjectives about yourself with no evidence attached, and explaining why the role would be good for you rather than what you'd contribute.
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Common questions
How long should a cover letter be?
Between roughly 250 and 350 words. That's enough to make one specific argument properly. Past that, readers skim and the specifics you worked hardest on get lost in the middle.
Do recruiters actually read cover letters?
It varies enormously by company and by role. Assume it may not be read, which argues for making the first two sentences carry your strongest point rather than saving it for the end.
Can I reuse one cover letter?
You can reuse the structure and your core evidence. Rewrite the opening and any sentence naming the company. A letter that could have been sent to anyone reads exactly like one that was.
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The opening line: make it prove you care about this company, not this job title
The first line is your only argument for reading the rest. If it says nothing specific about why THIS company, the reader already suspects it's a template they could swap any company name into. 'I am writing to apply for the Marketing Manager role at Acme Corp' is a waste — the recipient already knows you're applying. They can see the job title and company in the email header. That sentence does zero work.
Start with the single fact that proves you care about this company, not just the job title. 'Your sustainability commitments are the reason I'm interested in this role' or 'I've followed your work on [recent product or initiative] and want to contribute to that' or 'Your team built [something specific], and I want to help do more of it.' That fact doesn't have to be unique (other applicants know about it too), but it has to be specific enough that it wouldn't work for Acme's closest competitor.
Name the problem they're solving, not the job title. 'You're building offline-first tools for remote teams without reliable internet' is far better than 'for a Senior Backend Engineer.' It shows you understand what the role actually means. A recruiter reading 50 letters will remember the one that proved the candidate thought about the work, not just the job posting.
The structure that works: why the obvious one fails
Bad second move: listing three adjectives about yourself with no evidence. 'I am a results-driven, detail-oriented leader' with nothing attached is useless. Your resume already has bullets with evidence attached. In your letter, pick one achievement from your resume — the one that maps most directly to their problem — and tell the story it couldn't fit. 'At my last company, we cut deployment time from 40 minutes to 3 minutes; I led the infrastructure rewrite to get there.' That's evidence, not an assertion.
Third paragraph: what you'd want to understand or work on first. This shows you've thought about the role beyond the job description. 'I'd want to understand your current API versioning strategy and whether you're considering GraphQL' tells them you're not generic. It also tells them you've done homework and you think strategically about technical debt. Most letters feel weak in the middle because the writer added a second achievement or restated the resume. Don't. One specific claim, well-placed, outweighs two weak ones.
Fourth paragraph is your close. One line and your name. 'I'd be interested to discuss how I can help with [one thing they need]' or just 'Looking forward to talking.' Then your name. Most drafts that feel bloated got bloated because someone added a fifth paragraph. Resist that instinct. Four short paragraphs is enough and it's fast enough that readers finish it.
Tailoring without templating: when generic is honest
Templating means swapping company names and job titles into a fixed letter. It shows. Tailoring means genuinely different letters to different roles. To tailor without spending an hour per letter: scan their website, blog, and recent LinkedIn posts for one fact that would not apply to their closest competitor. That one fact is your anchor. If you can't find one, the company is generic enough that a generic letter is fine — you're not failing to tailor, you just don't have material.
The second paragraph should map to a specific job requirement, not a generic one. 'Proven ability to lead teams' is generic; 'You need someone comfortable with ambiguity in early-stage product teams, and I've spent three years there' is specific enough to tailor around. A career changer gets more value from tailoring than anyone else because a resume alone rarely explains the switch. The letter is where you make the case that the switch makes sense.
High-volume entry-level hiring (graduate schemes, internships) often skips cover letters entirely or skims them in seconds. If you're competing with 500 others for 10 spots, spend your time strengthening your resume instead. You get better ROI. For senior or specialist roles, or when the company explicitly asks for a letter, tailoring and specificity matter far more.
Frequently asked questions
Is a cover letter worth the time if it's optional?
Only if you have something specific to say. If you have a genuine reason for this company or a story your resume couldn't tell, write it. If you'd be filling space, skip it and spend time tailoring your resume instead, which has bigger effect.
How specific should I get about the company?
Specific enough that the letter wouldn't work for their competitor. One sentence about something they actually do (a product, a commitment, a recent move) is enough. Don't list company facts — show that you understand their problem.
Should I explain my career change in the cover letter?
Yes, if the change isn't obvious from your resume. The letter's whole point is to explain what the resume can't. For a career change, the letter is where you prove the switch makes sense and you're not just looking for any job.
What happens if I reuse a draft but forget to change the company name?
It's fatal. A recruiter reading the wrong company name stops reading. If you reuse drafts, save each version with the company name in the filename (Cover_Acme.docx, Cover_TechCorp.docx) to prevent this.
Should a cover letter ever be longer than 400 words?
No. Aim for 250–350. Past 400, readers skim and you lose specifics. Longer is not more persuasive; tighter is. If you're over 400, cut a paragraph or trim filler phrases.