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Cover letter for an engineering internship: a four-part method that fits on one page

An engineering internship cover letter is a one-page letter of 250 to 330 words that tells a recruiter why you chose their company, what you can prove, and when you are available. Most fail for the same three reasons: they fit any company, they list qualities without proof, and they repeat the CV.

What are the four parts of a cover letter?

Why them, what you bring with proof, why this role, and a closing with your dates. Together they fit on one A4 page.

1. Why them. One precise reason for choosing this organization: a product, a project, a technology, recent news, something you saw at a forum. "A leader in its field" says nothing; "your switch to by-wire steering on the next platform" says you looked.
2. What you bring, with proof. Two examples from your projects, internships or jobs, chosen to match what the posting asks for. For each: what you did, how, and the result, with a number when you can ("built a test bench that cut measurement time by a third"). Two solid examples beat six adjectives.
3. Why this role. What you want to learn here and how it fits your studies or your plan. Show you understood the job: name one or two of its tasks in your own words.
4. Closing. Your dates (start, duration, or that it's a required internship), an invitation to meet, and the closing formula.

How do I find a precise reason for choosing the company?

Look for one thing you could say about this company and about no other. Four places to look:

• The posting itself: the tasks it lists, in the company's own words.
• The company's latest news: a press release, a technical article, a new site or a new product line.
• A place you met them: a school forum, a conference talk, a factory visit.
• What they have built: a product or a technology you have used, studied or compared.

Then write it as one sentence with a fact in it. A quick test: replace the company's name with a competitor's. If the sentence still works, it is too vague.

What if I have little experience?

Use your projects: course projects, a student team, an association, a part-time job. Pick the two that are closest to the posting's first tasks and describe what you did and what came out of it. For example: "In a team of five, I designed the suspension mounts of our Formula Student car and checked them in simulation before the workshop built them." That is more convincing than "I am rigorous and a team player", because the reader can picture it.

What format should a cover letter follow?

One A4 page, with a body of about 250 to 330 words.

• Body: justified, in a plain font (11 to 12 pt).
• Header: your name and contact details, the date, the recipient (a name if you found one, otherwise the team and the company, with its address), and a subject line with the posting's title and reference.
• Signature under the closing: your name, and a scanned signature if you have one.
• File: a PDF named Lastname_Firstname_CoverLetter_Company.pdf. Some forms ask for the letter and CV in a single PDF: read the instructions.

English or French: how do the conventions change?

The layout and the opening and closing formulas change; the four parts stay the same.

Write the letter in the posting's language, unless the posting asks otherwise.

What does a good letter look like?

Here is a short example, written for a made-up student and a made-up posting (a test engineer internship at a brake supplier). Read it for its structure, not to copy it.

Dear Ms Taylor,

Your posting asks for someone to validate the steering feel of the next platform on a test bench. That is the part of the car I enjoyed most in my Formula Student year, and your move to by-wire steering is why I am writing to you.

In my school's team, I built a test bench for the steering column and cut each measurement from 45 to 30 minutes by automating the data capture in Python. During my first internship, I wrote the test report for twelve components and flagged two that were out of tolerance before delivery.

This internship would let me work on a system that is changing: the bench, the signal processing and the tests with drivers. It fits my specialisation in vehicle dynamics, and I would like to learn how a supplier validates a safety function.

I am available from 1 March 2027 for six months. I would be glad to present my projects in an interview.

Yours sincerely,
Camille Martin

It follows the four parts in order. The first paragraph gives a reason only this company could get (the steering project). The second gives two pieces of proof with numbers. The third names the tasks and what the student wants to learn. The last gives dates and asks for an interview. It is about 150 words, so there is room to add a third example if the posting asks for one.

Which phrases should I drop?

• "I am a dynamic, motivated and rigorous person": prove it with an example instead.
• "Your company, a leader in its field": find a precise reason.
• "As you can see in my CV": the letter should add what the CV can't say.
• "I am passionate about…" without anything that shows it.

What should I check before sending the letter?

• The company's name, the role and the reference are right (and not the previous company's).
• It fits on one page, and within the form's character limit if you paste it into a field.
• Your dates match what the posting asks for.
• Someone else has read it, or you've read it aloud once.

Keep reading

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• Internships abroad in 2027: when companies post, how long they last, which language they ask for
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