Software Engineer cover letter example

The situation: Mid-level backend engineer applying to a payments company, no referral, applying cold through the careers page.

Most engineering cover letters are unread, and the ones that are read get about fifteen seconds. That is enough for two paragraphs if they are specific and none if they are not. The letter below opens on something only someone who looked at the product could write, then spends its middle proving one relevant thing rather than summarising the whole resume.

If a posting does not ask for a letter, a short one still helps for a cold application and hurts nothing. Three paragraphs, under 250 words, no restating of the resume.

The letter

Your engineering blog post on moving settlement off the synchronous fan-out is the reason I am applying. I spent last year on the same problem at Northwind, on a ledger that could not go past 400 writes per second without reconciliation drift, and the outbox pattern you described is very close to what we landed on.

I rebuilt that ledger on an append-only event store and took sustained throughput to 9,200 writes per second with exact balance reconciliation, then led the shard migration that moved 42 million accounts off a single Postgres primary in six weeks with no downtime and no rollback. The part I am proudest of is not the number: it is that we shipped it incrementally, behind a dual-write and a comparison job, so that a rollback was always one flag away.

I am looking for a team where payments correctness is the hard part of the job rather than an afterthought, and where I can keep owning a system end to end: design, rollout and the pager. I would welcome the chance to talk about how you are handling reconciliation at your current volume.

Thank you for your time, Priya Raghunathan

Do

  • Name a real detail about their product, architecture or public writing in the first sentence.
  • Pick the single most relevant project and give it depth, including how you de-risked it.
  • Keep it under 250 words. Engineers read the resume; the letter's job is to earn that read.
  • Match the job title on the posting somewhere in the first paragraph.

Do not

  • Do not summarise your resume; the reader has it in the same window.
  • Do not list technologies. That is what the resume's skills line is for.
  • Do not open with your name and the role; the header already says both.
  • Do not claim passion for a domain you have never worked in. It is the easiest thing to test in an interview.

Questions

Software Engineer letter questions

Do engineering hiring managers read cover letters?

Some do, most skim, and a few filter on their absence when the posting asked for one. The asymmetry favours writing a short one: the downside is fifteen minutes, the upside is being the applicant who clearly looked.

How long should it be?

Three paragraphs, 150 to 250 words. A full page of prose signals that you are compensating for something.

What if I have no public detail to open on?

Open on the problem instead: the thing in the job description that is genuinely hard, and the closest version of it you have solved.

Draft yours from the actual posting

It reads your resume and the job description, then writes an opening that references something specific. Editing a draft is a different job from staring at a blank page.

See the matching software engineer resume example