Guide

Cover letter guide

A cover letter is a short piece of writing that does three things: it names the role, explains why you are a strong fit with specific evidence, and gives the reader a reason to keep reading your resume. That's it.

When a cover letter helps

A cover letter helps when the posting asks for one, when your resume needs context (a career change, an employment gap, a relocation), or when you have a specific reason for wanting this role at this company. It also helps when the company is small enough that a human will read it before any automated filter.

A cover letter is usually optional for large-scale online applications. If it is optional and you have nothing specific to say, you can skip it — a generic letter is worse than no letter at all.

Structure that works

Most strong cover letters have four parts, in this order:

  1. Opening. Name the role, say where you saw it, and give one reason you're interested. Two to three sentences.
  2. Evidence. One or two short paragraphs of specific work. Prefer outcomes and numbers over adjectives.
  3. Fit. Why this company, specifically. Name something concrete.
  4. Closing. Thank the reader and note how to reach you. Two to three sentences.

The opening paragraph

The first line is the one that decides whether someone reads the second. Good openings do one of three things:

  • Name a warm connection. "A colleague on your data platform team suggested I reach out."
  • Name a specific role and a specific reason. "The mix of high-throughput systems and long-term ownership is exactly the environment I have been looking for."
  • State a fact that maps to a need. "I have spent the last four years in a 24-bed medical-surgical ICU."

Avoid openings that begin with "I am writing to express my strong interest in..." — the reader already knows that. Open with something only you could write.

Evidence that lands

The strongest body paragraphs have a specific mechanism (what you did) followed by a specific result (what changed). For example:

Last year I led a project to rebuild the pipeline, replacing a chain of queue consumers with a partitioned consumer-group design and adding structured tracing across all twelve services. The change cut p95 end-to-end latency from 850ms to 210ms.

Notice that the second sentence is a metric. Not every project has a clean number, but try to include one wherever you can. If a project doesn't have a measurable result, describe the scale instead — team size, user count, budget, geographic reach.

What to avoid

  • Restating your resume. The reader has it. Give context, not repetition.
  • Generic praise. "Your company is a leader in the industry" tells the reader nothing.
  • Apologising. Don't write "I know I don't have all the requirements, but…".
  • Long paragraphs. Three sentences per paragraph is usually enough.
  • More than one page. Nobody has asked for a longer cover letter.

Matching your resume

Use the same fonts, page size, and colour palette as your resume. The two documents will be read as a pair, and a mismatched pair looks less considered. Omni Resume uses the same templates, fonts, and palettes across the resume and cover letter builders for exactly this reason.

Length and format

A cover letter should fit on one page. Aim for 250–400 words. Print at A4 or Letter with 20–25mm margins. Save as PDF using your browser's "Save as PDF" option.

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