Software Engineer cover letter that gets read
Most engineering cover letters are ignored because they say nothing. Yours should read like a good commit message: specific and short.
The tone that works
Direct and technical. No buzzwords, no 'synergy', no flattery.
How to open
Name the role, then lead with your most relevant technical achievement. Engineers respect density.
A real example opening
I have spent four years building checkout infrastructure that handles 3.4M monthly sessions, and your posting's mention of migrating to event-driven payments is exactly the kind of problem I want to work on next. At Northwind, I led the rebuild that cut our p95 latency 42%, and I wrote up the migration approach at devonmarlow.dev/payments-migration.
What to include
- The stack you share with the company, named exactly
- One project with scale numbers: users, latency, data volume
- A link to something real: GitHub, a shipped product, a technical blog post
- Why their product or engineering problem interests you, specifically
Mistakes that get letters skipped
- Writing 'I am a passionate problem solver' instead of showing a problem you solved.
- Sending the same letter everywhere. Engineers can smell a template.
- Explaining what the company does back to them. They know.
- Skipping the letter entirely when the posting asks for one. It is a filter.
Common questions
Do tech companies read cover letters?
Startups and mid-size companies often do. Big tech rarely does unless the application requires one. When in doubt, write a short, dense one.
How technical should it get?
Name real technologies and one real result, but save the deep dive for the interview. Three paragraphs is plenty.
Should I mention open source?
If it is relevant and real, yes, with a link. A maintainer or contributor line is worth more than a paragraph of adjectives.
Pair it with the resume
A strong letter needs a strong resume behind it. See our software engineer resume guide for the ATS keywords and format that match.
Software Engineer resume guide