How to Write a Cover Letter That Gets Read

A cover letter that gets read has one job: to make the reader look at your resume with more interest. Many recruiters skim cover letters and some skip them, and career services say so plainly. UC Berkeley's career centre notes that some recruiters read the letter while others focus on the resume, and recommends writing a customised letter for every position anyway (UC Berkeley: cover letters). For data roles, the best letters are short, specific and full of evidence.

The structure

MIT's career office recommends a clear structure of introduction, body paragraphs and conclusion, all on less than one page, with the role named in the opening and at least two body paragraphs connecting your experience to the job (MIT CAPD: writing a cover letter). For data roles, aim for about 250 to 350 words:

1. Opening (two or three sentences): the role, why this company, and your strongest relevant evidence in one line.
2. Body paragraph one: one project or achievement that matches the job's main need, told as problem, what you did, tools, and result.
3. Body paragraph two: a second piece of evidence covering another requirement, or your domain knowledge, or how you work with stakeholders.
4. Closing (two sentences): what you would bring and a simple request to discuss it.

Address it to a named person if you can find the hiring manager; otherwise "Dear Hiring Manager" is fine, as Berkeley suggests.

Make the body about data work

Recruiters for data roles want to see three things that a resume shows poorly:

• How you think. Explain one decision: why you chose a metric, how you handled missing data, why you rejected a first result.
• Who used your work. Name the audience and what changed: "the operations team now uses the dashboard to plan staffing each week".
• Why this domain. If the company is in retail, fintech or healthcare, connect it to your experience or project.

Do not repeat your resume's bullet list in sentences. Pick one or two stories and give them the depth a resume cannot.

An example letter (illustrative)

Dear Hiring Manager,

I'm applying for the Junior Data Analyst role at a regional grocery chain (ref. DA-114). I've spent the past year building retail dashboards, and your focus on reducing stock-outs is exactly the problem I enjoy working on.

In my final-year project, I analysed two years of a public online retail dataset to find which products sold out before restocking. I cleaned 500,000 transactions in SQL, removed returns and test orders that would have inflated demand, and built a Power BI report showing weekly demand against stock. The clearest finding was that a few products drove most of the stock-outs, so the report ranks them first.

Before studying data, I worked for two years as a store supervisor, so I know how store teams use (and ignore) reports. I design dashboards to answer one question each, and I check numbers against source totals before anything is shared.

I would welcome the chance to discuss how I could help your team. Thank you for your time.

Yours sincerely, [Name]

The letter names the role, gives a reason for this employer, tells one project with tools and a result, and adds domain experience. It is under 250 words.

Tailor in fifteen minutes

Keep a base letter and change four things for each application: the role and company, the reason you want this job, the project that best matches the posting, and the domain sentence. A useful test: if you could swap in another company's name and nothing would read wrong, the letter is not specific enough yet.

Mistakes that get a letter skipped

• Opening with "I am writing to apply for..." and nothing else in the first sentence.
• Generic praise for the company that could apply to anyone.
• Listing tools without saying what you did with them.
• Going over one page, or writing in blocks of dense text.
• Claiming skills the resume does not support.
• Typos in the company name.

When a cover letter matters most

Write one with particular care when you are changing careers, when you have a gap to explain briefly, when the role is in a domain you know, when the posting asks for one, or when you are applying directly to a small company where the founder or manager reads every application. For large portals that ignore it, a short tailored letter still costs little.

Pair your letter with a strong resume for data roles and a short spoken version of the same story, as in crafting an elevator pitch. For entry-level applicants, see your first data job with no experience.

Projects strong enough to anchor a cover letter are built in the Data Analytics course.

Sources

• Career toolkit: Writing a cover letter (MIT Career Advising and Professional Development) — MIT CAPD
• Cover Letters (UC Berkeley Career Engagement) — UC Berkeley Career Engagement