Is This Sales Candidate Just Good at Interviews?

Candidate Assessment
Written by Ashley Wesley

The way to tell whether a sales candidate is good at the job or just good at interviews is to stop grading the conversation and start grading evidence: the same job-related questions for every candidate, answers about what they actually did, scored against a written standard, plus a realistic selling task. Research shows the charm that wins an interview carries over to the job far less than it seems to in the room.

Why are salespeople so good at interviews?

Here's the fair part. Salespeople are supposed to be good in a room. Building rapport fast, reading people, handling a tough question with a smile... that's part of the job. A candidate who can't do it in an interview probably can't do it with your customers either.

The problem is that an interview is the one sales call where the candidate is selling the product they know best: themselves. They've rehearsed it. They know the objections. And the buyer, which is you, wants to be sold.

What does the research say about interview performance vs job performance?

Three findings stand out.

Most candidates shape the truth. In a set of six studies with 1,346 participants, Levashina and Campion (2007) found that "over 90% of undergraduate job candidates fake during employment interviews." And the share whose faking edged toward lying ranged from 28% to 75% depending on the behaviour (Levashina & Campion, 2007).

Self-promotion moves the interview score more than it predicts the job. A meta-analysis by Barrick et al. (2009) found that impression management (how candidates present themselves) was correlated .47 with interview ratings but only .15 with later job performance ratings (as cited in Peck & Levashina, 2017). The title says it plainly: what you see may not be what you get. A later meta-analysis with a combined sample of 8,635 found that self-focused tactics, like talking up your own achievements, "are more effective in the interview rather than in job performance settings" (Peck & Levashina, 2017).

Interviewers can't reliably spot it. An editorial summarizing the research noted that "observers tend to be quite poor at identifying and distinguishing honest and deceptive IM" (Bourdage et al., 2017). IM is impression management.

Add first impressions to the mix. A 2026 meta-analysis of 145 studies found that how people communicate drives first impressions more than what they say. As one of the authors put it, "content cues were the weakest predictors of first impressions" (Hamilton, 2026; Yang et al., 2026). For a sales candidate who is polished and warm, that's a big head start before the content of their answers even registers.

Does a structured interview actually fix this?

It helps a lot. The most recent large review of hiring methods found that structured interviews had the highest average validity of any common predictor, at .42, while unstructured interviews came in at .19 (Sackett et al., 2022, 2023). That's more than double. Its authors wrote: "Structured interviews emerged as the top-ranked selection procedure" (Sackett et al., 2022, abstract).

Two honest caveats:

  • Structure isn't magic. The same review showed a wide range of results for structured interviews, so how you run them matters (Sackett et al., 2022).
  • Some polish is real skill. Peck and Levashina (2017) found that other-focused tactics, like showing interest in the interviewer, related somewhat more to job performance ratings (.25) than to interview ratings (.17). For a sales role, warmth isn't a red flag. Unproven claims about yourself are.

Ontario's Human Rights Commission points the same way for fairness reasons: employers "should develop set questions in advance, and ask all applicants the same questions" (Ontario Human Rights Commission [OHRC], 2008, section IV-5).

How to tell if a sales candidate is just good at interviews

  1. Write down what good looks like before the first interview. List the four or five behaviours your best salespeople show, and what a strong, average and weak answer sounds like for each. Our post on sales competencies vs skills can help.
  2. Ask about the past, not the hypothetical. "Tell me about the last deal you lost" beats "What would you do if you lost a deal?" Past-behaviour questions resisted faking better than situational ones (Levashina & Campion, 2007).
  3. Get specifics, then stop. Ask for names of the product, deal size, timeline and what the buyer said. Vague answers are your signal. One caution from the research: asking follow-up questions actually increased faking (Levashina & Campion, 2007), so ask for detail, not a cross-examination.
  4. Score each answer before you talk about the candidate. Rate against your written standard right after each question. Fast gut decisions are common: in one field study of 166 interviewers, about 30% of decisions were made in the first five minutes, while asking every candidate the same questions slowed decisions down (Frieder et al., 2016).
  5. Make them sell something real. A short role play with your actual product, a real buyer objection and a buyer who doesn't want to be rushed shows you how they work. Work samples had a validity of .33 in the same review (Sackett et al., 2023). Our post on pre-employment sales assessments covers how to set one up.
  6. Check the story with people who saw it. Quota claims, rankings and "I built that territory" can all be confirmed by a former manager. See our guide to evaluating sales candidates.
  7. Separate the likeable from the capable in your notes. Write "how did they make me feel?" and "what did they prove?" in two columns. Hire on the second column.

Two things that are both true

We'll own this one. HR people and owners, us included, love a great interview. It feels like evidence because we were there. That's exactly why it's dangerous.

A candidate who interviews well might be your next top rep. Plenty are. But the interview alone can't tell you, because the skill it measures best is the skill of interviewing. For owners in Guelph and across Ontario hiring their next salesperson, the fix is cheap: same questions, real examples, a written score, and one honest sales task. That's how you find out which part was the pitch and which part was the person.

In short

To tell whether a sales candidate is just good at interviews, use a structured interview: the same job-related questions for everyone, answers about real past situations, and a written scoring guide, plus a realistic sales task and reference checks. Impression management correlated .47 with interview ratings but only .15 with job performance ratings (Barrick et al., 2009, as cited in Peck & Levashina, 2017). Structured interviews have validity more than double that of unstructured ones (.42 vs .19; Sackett et al., 2022, 2023).

Key takeaways

  • Over 90% of undergraduate candidates in one research program faked in some way, and 28% to 75% engaged in faking closer to lying (Levashina & Campion, 2007).
  • Impression management correlated .47 with interview ratings but .15 with job performance ratings (Barrick et al., 2009, as cited in Peck & Levashina, 2017).
  • Interviewers are poor at telling honest self-presentation from deceptive self-presentation (Bourdage et al., 2017).
  • Structured interviews averaged .42 validity against .19 for unstructured interviews (Sackett et al., 2022, 2023).
  • Past-behaviour questions resist faking better than hypothetical ones (Levashina & Campion, 2007).
  • A realistic sales task adds evidence the conversation can't; work samples averaged .33 validity (Sackett et al., 2023).

Frequently asked questions

Why do some salespeople interview well but perform poorly?

Interviews reward self-presentation, and salespeople are skilled at it. Research found impression management correlated .47 with interview ratings but only .15 with later job performance ratings (Barrick et al., 2009, as cited in Peck & Levashina, 2017). The interview measures the pitch more than the work.

What is a structured interview?

A structured interview asks every candidate the same job-related questions, in the same order, and scores answers against a written guide. It's the strongest single predictor of job performance in recent research (Sackett et al., 2022).

Are behavioural or situational questions better for sales hiring?

Behavioural questions about real past situations held up better against faking than hypothetical situational questions (Levashina & Campion, 2007). Use behavioural questions as your core, and add a role play to see skills in action.

Should every sales candidate get the same interview questions in Ontario?

Yes, as a rule of thumb. The Ontario Human Rights Commission advises asking all applicants the same questions, set in advance, to keep the process fair and job-related (OHRC, 2008). This is general information, not legal advice; confirm with employment counsel.

How long should a sales interview be?

Long enough to cover your core questions and a short sales task without rushing. In one study, about 30% of interview decisions were made within five minutes (Frieder et al., 2016), so the bigger risk is deciding too early, not running too short.

Work with us

Down to your last few candidates? Our Final Candidate Review tests your finalists against your own best people before you make the offer. If it doesn't help, you don't pay.

This post is general information, not legal advice. Confirm employment decisions with employment counsel.

References

Ashley Wesley
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How to Hire Your First Salesperson (Without Betting the Company on a Gut Call)