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Cover letter example

System Administrator Cover Letter Example

IT managers hiring a systems administrator read for uptime, safe patching, tested backups and a network that just works. This letter opens on uptime, then shows patching, restores and automation, tied to an employer joining two offices on one network.

Mid career · 282 words · Last reviewed 4 November 2026 · 3 min read · How we write these

The job this letter answers

Systems Administrator, Alster Maritime Services

Alster Maritime Services manages crews and repairs for 40 cargo ships from offices in Hamburg and Bremen, with 220 shore staff, and is joining both offices on one network this year.

  • Run Windows and Linux servers and the office network
  • Keep uptime high
  • Patch and back up systems on a schedule
  • Support users and document the setup
Template

The letter takes the colors of the resume template, the same way a downloaded cover letter matches your resume.

Lars Brandt

Hamburg · lars.brandt@example.com

4 November 2026

Mr Jens Petersen

Head of IT

Alster Maritime Services

Subject: Application for Systems Administrator

Dear Mr Petersen,

Last year the 45 Windows and Linux servers and the office network I run for 150 users at Hansa Engineering reached 99.9% uptime. I am applying for the Systems Administrator role at Alster Maritime Services, where the network matters as much as the servers.

Patching runs monthly in a set maintenance window, with critical updates applied within a week. All servers are backed up nightly, and I test a full restore every quarter, because a backup nobody has restored is only a hope. I also automated new starter setup with PowerShell scripts, cutting laptop and account setup from two hours to 20 minutes. Writing things down is part of the same habit: at Elbe Logistics I wrote guides for the ten most common user problems before anyone asked.

Alster Maritime joining its Hamburg and Bremen offices on one network is the project that made me apply, since I already run the servers and the office network as one system at Hansa, using Hyper-V, Active Directory and Microsoft 365. Two offices also make your line about supporting users and documenting the setup more important. I handle about 25 tickets a week, resolve 80% within one working day, and keep the network and server setup in a shared wiki so a colleague can cover during holidays. I moved up from the help desk at Elbe Logistics, where I learned Linux outside work hours, moved the file server to Linux and later passed LPIC-1.

Reviewing your current backup and patch routine together in an interview would show you how I work faster than any answer I could give. Which of your systems causes the most support calls is the other thing I want to learn.

Best regards,

Lars Brandt

A made-up letter. The person, the employers and every number are invented, and any resemblance to a real one is chance. Sending it by email? Put the subject line in the email’s subject box, add your name to it, and attach the letter as a PDF.

Paragraph by paragraph

  1. The opening

    Starts: “Last year the 45 Windows and Linux…”

    States the uptime figure with its scope, then names the role in a plain sentence.

  2. Your strongest evidence

    Starts: “Patching runs monthly in a set maintenance…”

    Answers the patch and backup line with a schedule and a restore test, and adds automation as proof of saved time.

  3. Why this employer

    Starts: “Alster Maritime joining its Hamburg and Bremen…”

    Ties the reason for applying to the employer's network project, covers the network line the old letter missed, and answers the support and documentation line in the advert's words.

  4. The close

    Starts: “Reviewing your current backup and patch routine…”

    Suggests a working session on the employer's own routine and asks a practical question.

Why this letter works

  • The uptime figure comes with its scope: servers, network and users.
  • Restore tests are named, which separates real backup practice from a nightly job nobody checks.
  • The reason for applying is the employer's two-office network project, and the writer already runs servers and network together.
  • The close proposes a working session rather than a general chat.

How to write your own system administrator cover letter

  1. Give uptime with its scope: how many servers and users it covers.
  2. Say how often you test a full restore, not only how often backups run.
  3. Answer the network part of the advert, even in one clause; many sysadmin letters forget it.
  4. Mention documentation that lets a colleague cover your holidays.
  5. Offer to review the employer's backup or patch routine with them in the interview.

Common questions

Should a systems administrator mention scripting languages?

Name the one that produced a result, such as PowerShell for new starter setup. A list of languages without results adds little.

How do I show I can handle a network project I have not run before?

Show the parts you already do, such as running servers and network together, and say what you would want to learn about their sites.

Is a Linux certificate useful for a mostly Windows role?

It helps when the advert mentions Linux servers. Mention it once; the resume can hold the details.

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