Reference Checks: How to Prepare Your Referees

Reference checks usually come at the very end of hiring, when the team has decided it wants you. That makes them easy to underestimate. A referee who is surprised by the call, vague about your work or describing a different job from the one you applied for can slow an offer or plant doubt. A little preparation avoids that.

What employers use references for

The US Office of Personnel Management describes reference checking as an evaluation of a candidate's past job performance based on information from people who worked with them, such as supervisors, peers and people they managed. It is used for two things: to verify what candidates have said in their resume and interviews, and to predict how well they will do in the job (OPM: reference checking).

OPM also summarises the research: reference checks are a useful predictor of job performance, training success, promotion potential and turnover. They predict performance better than years of education or experience, though less well than cognitive ability tests, and adding structure, the same questions asked of every referee, makes them more valid.

In practice, a reference call for a data role usually covers your role and responsibilities, the quality of your work, how you worked with others, how you handled pressure or mistakes, and whether they would work with you again. Some employers also ask a separate background verification company to confirm dates, titles and education.

Choosing your referees

MIT's career office advises lining up references in advance but not listing them on your resume until asked, since employers assume references are available (MIT CAPD: resumes). Choose people who:

• Saw your work closely, ideally a manager or team lead who assigned and reviewed it.
• Can speak to the skills this role needs. For a data engineering role, the lead who reviewed your pipelines beats a senior executive who barely knew you.
• Are recent. Someone from the last two or three years carries more weight.
• Will respond quickly and speak warmly.

Have three ready: usually a current or recent manager, a senior peer or stakeholder, and one more manager or a client. Freshers can use internship supervisors, project guides and lecturers who supervised substantial work.

Ask first, then brief

Always ask before giving someone's name, and ask in a way that lets them decline: "Would you be comfortable giving me a reference for a data analyst role? It's fine to say no if you're busy."

Once they agree, send a short briefing:

• The role and company, with the job description.
• What they will probably be asked, based on the job's main requirements.
• Two or three pieces of your work they saw, with the result: "the sales forecast model we shipped in March, which the planning team adopted".
• Your updated resume, so their dates and titles match yours.
• Timing and contact method: who might call or email and roughly when.

This is not asking anyone to say anything untrue. It reminds a busy person of real work and points them to the parts that matter for this job.

A briefing template

"Thank you for agreeing to be a reference. The role is Senior Data Analyst at a fintech company (job description attached). They are most interested in SQL depth, stakeholder communication and experiment analysis. Things you saw that are relevant: the pricing experiment analysis I led last year, which changed the plan for the new tier, and the weekly metrics review I ran with the product team. My resume is attached so dates match. Their recruiter may email you this week. Thank you again."

Awkward situations

Your current employer does not know you are leaving. Say so to the hiring company; most will wait until after an offer before contacting your current manager, or use a former manager instead.

You left on poor terms with a manager. Use another person who saw your work at that job, such as a senior peer, a different lead or a client, and be ready to explain briefly and without criticism.

You have a gap or a short role. Choose referees who can speak to the work you did before and after, and explain the gap in one honest sentence if asked.

Dates or titles do not match. Fix it before the check. Mismatches between your resume and what a referee or verification agency reports can easily delay an offer.

After the check

Tell your referees how it went, and thank them whatever the outcome. If you get the job, a short message saying so keeps the relationship strong for the next time you need them, and offer to return the favour.

For the steps around this stage, see how to handle multiple job offers gracefully and, once you start, building a 30-60-90 day plan.

The project experience that gives referees something specific to describe is built in the Data Analytics course.

Sources

• Reference Checking (US Office of Personnel Management) — US Office of Personnel Management
• Resumes (MIT Career Advising and Professional Development) — MIT CAPD