Do tech jobs require cover letters and how should you write one?
Tech jobs sometimes require cover letters and sometimes make them optional. When a cover letter is optional, submitting a strong one demonstrates initiative and adds context your resume cannot provide. A strong tech cover letter is specific to the company and role, connects your technical background to the company's actual problems, and is under 350 words. Generic cover letters that could be sent to any company are worse than no cover letter at all.
Cover letters in the technology industry occupy a peculiar position. Many engineers dismiss them as irrelevant, and many companies explicitly say they are optional. But a well-written, specific cover letter still creates meaningful advantage in two situations: when you are applying to a role where competition is intense and differentiation matters, and when you have a genuine connection to the company or role that your resume does not communicate on its own. The key distinction is between a generic cover letter (adds nothing) and a specific, purposeful cover letter (adds real signal).
When to Write a Cover Letter
Always write one when:
- The application explicitly requires it
- You have a specific reason for targeting this company that is not obvious from your resume (personal mission alignment, using the product, connection to the founder, etc.)
- You are a career changer and your resume does not tell your story clearly
- You are explaining a resume gap, relocation, or unconventional background
Write one if it is optional when:
- You have something specific and compelling to say about this role or company
- You are applying for a senior or leadership role where narrative context helps
- You know who will read it and believe a human will actually see it
Consider skipping it when:
- The company has a reputation for not reading cover letters (some explicitly say so)
- You have nothing genuinely specific to say and would write a generic letter
- The application process is purely ATS-driven with no human review at the screening stage
- You are applying to dozens of similar roles and tailoring each one is not feasible
An honest generic cover letter is worse than no cover letter. A thoughtful specific one is better than both.
The Structure of a Tech Cover Letter
A strong tech cover letter has four paragraphs and stays under 350 words:
Opening paragraph — the specific hook: Say why you are writing and connect it to something specific about the company or role. Not "I am excited to apply for the Software Engineer role" — every applicant says that. Instead: "I have been a user of [Product] for three years and when I saw that your infrastructure team is investing in Kafka-based real-time pipelines, I recognized immediately that my work on event-driven architectures at [Company] could contribute meaningfully."
Second paragraph — your relevant technical background: Pick the two or three most relevant experiences or skills for this specific role and describe them concisely with evidence. This is not a resume summary — it is a selective argument for why you are a strong match for this role's specific requirements.
Third paragraph — why this company: What genuinely interests you about this organization? Mission, technical culture, specific product challenges, reputation for engineering excellence, domain expertise you want to build? This paragraph should be specific enough that it could not be copy-pasted into an application for a different company.
Closing paragraph — clear next step: Express interest, note availability, and make the ask clearly but professionally. "I would welcome the opportunity to discuss how my experience with distributed stream processing maps to the challenges your infrastructure team is working on. I am available for a conversation at your convenience."
"I read cover letters carefully for senior and leadership roles. What I'm looking for is whether the candidate has done enough research to say something specific about us, and whether they can communicate clearly in writing. Most cover letters are obviously generic and waste everyone's time. The ones that reference our actual technical challenges make me want to call the candidate immediately." — CTO, Series B startup
Opening Paragraph: The Specific Hook
The most important sentence in your cover letter is the first one. A specific opening immediately distinguishes your letter from the dozens of generic ones.
Generic (weak): "I am writing to express my interest in the Software Engineer position at Acme Corp. I believe my skills and experience make me an excellent candidate."
Specific (strong): "When Acme Corp announced your investment in edge computing infrastructure last quarter, I recognized it as exactly the problem space I've spent the last four years building expertise in at [Company], where I architected the distributed caching layer for 50M daily active users."
The specific opening requires research. You need to know something real about the company — a recent announcement, a blog post, a known engineering challenge, a product you use. This research is the work that separates a meaningful cover letter from a template.
Body: Connecting Your Background to Their Problems
The body of your cover letter is not a prose version of your resume. It is a targeted argument.
Pick one to two specific experiences or skills that map most directly to what this role requires, and describe them with evidence. The goal is to make the hiring manager think: "This person has already solved something like our problems."
Weak body paragraph: "I have extensive experience in backend engineering using Python and Java, and I am proficient in cloud platforms including AWS. I am a quick learner who adapts well to new environments."
Strong body paragraph: "At [Company], I led the migration of a monolithic payment processing system to event-driven microservices, reducing transaction processing latency by 70% and enabling the team to scale to 10x the transaction volume without proportional infrastructure cost. Your job description mentions modernizing a legacy settlement system — that specific challenge maps closely to what I have already shipped."
The second paragraph does two things the first does not: it provides specific evidence, and it explicitly connects that evidence to the company's problem.
The "Why This Company" Paragraph
Many engineers write weak why-company paragraphs that state general enthusiasm without specifics:
Weak: "I am very excited about Acme Corp's innovative technology and collaborative culture. I would love to contribute to your team's mission."
This paragraph could be sent to any company and says nothing. The hiring manager has read it thousands of times.
Strong: "I have been following [Company]'s work on zero-knowledge proofs for financial auditing since your 2022 paper. The technical challenge of applying ZKP at the scale you are targeting is exactly the problem I want to spend the next several years on. That is not a statement I can make about most companies — it is specific to what you are building."
Research sources for a strong why-company paragraph: engineering blogs, recent papers or technical talks, job postings that hint at upcoming technical challenges, Glassdoor engineering culture reviews, and conversations with current or former employees.
Common Cover Letter Mistakes in Tech Applications
| Mistake | Why It Fails | Fix |
|---|---|---|
| Generic opening | Indistinguishable from every other letter | Start with something specific to this company |
| Restating the resume | Redundant — the resume is already there | Select and argue; don't summarize |
| Vague enthusiasm | Unbelievable if not grounded | Name what specifically interests you |
| Too long (over 400 words) | Recruiters stop reading | Cut to the essential argument |
| Weak closing | Leaves recruiter without clear next step | Make the ask explicitly |
| No specific company research | Signals you didn't care enough to look | Research before writing, always |
Format and Submission Details
Length: Under 350 words, ideally 250-300 words. Hiring managers are busy. Respect their time by making your point efficiently.
Format: Standard business letter format. No graphics, no creative layouts, no fancy fonts. The cover letter should be as readable as the resume.
File: If the application allows separate uploads, submit as a PDF. If required in a text box, plain text with paragraph breaks.
Header: Match the header of your resume for visual consistency. Same name, contact information, and formatting.
Personalization: Address to a specific person whenever possible. "Dear [Name]" is stronger than "Dear Hiring Team." LinkedIn and the company website often reveal the hiring manager's name.
"The best cover letters I have received read like the candidate wrote to me personally. They know something about our work, they have a specific reason for wanting to join, and they can back up the claim with evidence. They treat the cover letter as a writing sample, not a formality." — VP of Engineering, Series C company
Frequently Asked Questions
Should I include salary expectations in my cover letter? No, unless the application specifically requires it. Including salary expectations proactively limits your negotiating position. If the application requires it, provide a range based on your research rather than a single number.
What if I don't know who the hiring manager is? Use "Dear Hiring Team" or "Dear [Company] Engineering Team." These are neutral and professional. "To Whom It May Concern" is outdated. Avoid gendered greetings. If you can find the name through LinkedIn or the company website, use it — even if you are not certain it is the exact hiring manager.
How do I write a cover letter for a company I genuinely know nothing specific about? Research before writing. Look at their engineering blog, recent press, job descriptions, Glassdoor reviews, LinkedIn content, and any public talks from their engineering leadership. If after thorough research you still have nothing specific to say, ask yourself whether you are genuinely interested in this company or just applying broadly. The answer affects how much effort the cover letter deserves.
References
- Harvard Business Review. (2021). How to Write a Cover Letter That Actually Works. Harvard Business Publishing.
- Gayle Laakmann McDowell. (2015). Cracking the Coding Interview (6th ed.). CareerCup.
- Bock, L. (2015). Work Rules!. Twelve.
- LinkedIn Talent Solutions. (2022). What Recruiters Want: Application Quality Survey. LinkedIn Corporation.
- Dill, K. (2022). Employer and recruiter cover letter preferences. Wall Street Journal.