What is a backdoor reference?

A backdoor reference is calling someone who knows a candidate off the record, like a peer at their current company or a trusted industry contact, instead of the references the candidate listed. It feels like smart due diligence, but it is a breach of trust and it rarely produces better insight.

Why do backdoor reference checks backfire?

Three reasons: they break confidentiality and put a quietly interviewing candidate's livelihood at risk, the feedback is unreliable because you rarely know how well the source knew the person or in what context, and the source's values may clash with your company's, which makes their opinion a poor basis for your decision. The result tends to be gossip, not guidance.

Are backdoor references especially risky in construction?

Yes. Construction is a small industry where reputation is everything and word travels fast; a quick off-the-record call can unravel months of careful professional discretion and permanently damage someone's standing at their current company.

What should I do instead of backdoor references?

Ask the candidate directly, ask better interview questions, have better conversations with their listed references, and build enough trust that candidates want to be transparent with you. If you cannot trust a candidate and the people they chose to vouch for them, you should not be hiring them at all.

Stop Doing “Backdoor References” · Ambassador Group

In this piece

1.1. They Break Confidentiality
2.2. The Feedback Is Unreliable
3.3. Values Might Not Be Transferable
4.What to Do Instead

About the author

TJ Kastning

Founder & Managing Partner

TJ founded Ambassador Group after years recruiting for construction organizations, watching misaligned leadership decisions cost projects, margin, and morale. He believes hiring is a deep leadership discipline, not just a transactional function. It shapes culture, capacity, and long-term outcomes. His work with clients focuses on clarifying expectations, surfacing assumptions, and helping leaders think more clearly about the environments they are creating. TJ is involved in every search as guide and thought partner.

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Let’s be honest: you do it because you want the real story.

You know candidates only list references who will say good things. So, you pick up the phone and call someone who knows them “off the record.” Maybe it’s a peer at their current company or a contact you trust in the industry.

It’s just smart due diligence. Right?

It’s not.

It’s a breach of trust,and, worse, it rarely gives you better insight.

Here’s why backdoor references usually backfire.

1. They Break Confidentiality

Most professionals interview quietly for a reason. When you start calling around about a candidate who hasn’t told their employer they’re looking, you’re putting their livelihood at risk.

You may think you’re being discreet, just calling a “friend of a friend”, but word travels fast. A quick conversation can unravel months of careful professional discretion and permanently damage someone’s standing at their current company.

In a small industry like construction, where reputation is everything, that’s not a trivial mistake.

2. The Feedback Is Unreliable

Let’s say you do get someone on the phone. How well do they really know the person you’re asking about?

Were they distant colleagues? Close peers? A short-term collaborator on a bad project? You don’t know, and you probably won’t get the full context in a five-minute call.

Even when the intent is good, backdoor references tend to produce gossip, not guidance.

3. Values Might Not Be Transferable

You might think, “This VP of Construction will know what they’re talking about.” But if that person leads with values or expectations that clash with your company’s, why would their opinion hold weight in your hiring decision?

Calling someone you wouldn’t hire to validate your hiring decision makes no sense.

What to Do Instead

If you want to learn more about someone, ask them.

Ask better interview questions.
Have better conversations with their listed references.
Build enough trust that candidates want to be transparent with you.

If you can’t trust a candidate and the people they’ve chosen to vouch for them, you shouldn’t be hiring them in the first place.

Backdoor references might feel clever. But they’re a symptom of weak process, not strong discernment.

Better interviews build better decisions.

Questions, answered

The short version.

What is a backdoor reference?: A backdoor reference is calling someone who knows a candidate off the record, like a peer at their current company or a trusted industry contact, instead of the references the candidate listed. It feels like smart due diligence, but it is a breach of trust and it rarely produces better insight.
Why do backdoor reference checks backfire?: Three reasons: they break confidentiality and put a quietly interviewing candidate's livelihood at risk, the feedback is unreliable because you rarely know how well the source knew the person or in what context, and the source's values may clash with your company's, which makes their opinion a poor basis for your decision. The result tends to be gossip, not guidance.
Are backdoor references especially risky in construction?: Yes. Construction is a small industry where reputation is everything and word travels fast; a quick off-the-record call can unravel months of careful professional discretion and permanently damage someone's standing at their current company.
What should I do instead of backdoor references?: Ask the candidate directly, ask better interview questions, have better conversations with their listed references, and build enough trust that candidates want to be transparent with you. If you cannot trust a candidate and the people they chose to vouch for them, you should not be hiring them at all.