Why Good Interviewers Don't Just Trust Their Instincts

Imagine this scenario...

You interview two candidates for the same role.

One is articulate, confident and immediately puts everyone at ease. The other is quieter, more measured and takes longer to answer questions. At the end of the day, the hiring panel unanimously agrees the first candidate is the obvious choice.

Six months later, the successful hire is struggling in the role, while the other candidate has gone on to excel elsewhere.

Most experienced managers have lived through some version of this story. The uncomfortable truth is that interviews often tell us as much about our own psychology as they do about a candidate's ability.

Interviews are intended to be objective assessments of competence. Without careful preparation and structure, however, they can quickly become shaped by first impressions, unconscious bias and intuition long before enough evidence has been gathered.

Today, that challenge is greater than ever.

AI can produce polished CVs in minutes, and candidates have unprecedented access to interview coaching, preparation resources and, in some remote interviews, even real-time assistance. A strong application and confident interview performance no longer guarantees genuine capability.

That doesn't make interviews less important. It makes it even more important to separate evidence from impression.

Research consistently shows that we form first impressions within moments of meeting someone. Before we've properly explored experience or tested knowledge, our brains are already making assumptions about competence, trustworthiness and potential.

Those impressions then influence how we interpret everything that follows.
One of the strongest influences is the halo effect. When we notice one positive characteristic, we unconsciously assume other strengths will be present too. A confident candidate begins to feel like a capable leader. An engaging conversationalist is assumed to be technically strong. Yet none of those conclusions are necessarily supported by evidence.

The reverse is also true. Thoughtful or more reserved candidates can be underestimated, simply because they communicate differently.

Another common trap is similarity bias. We naturally warm to people who remind us of ourselves, whether that be through shared experiences, backgrounds or communication styles.

Without realising it, we can mistake familiarity for suitability.

How often have we left an interview thinking, "They'd fit in well here"?

Sometimes what we really mean is, "I enjoyed talking to them."

Confirmation bias reinforces the problem. Once we've formed an opinion, we often seek evidence that supports it while overlooking information that challenges it.

Questions become less probing and interviews shift from testing capability to validating first impressions.

We're not suggesting that instinct has no place in recruitment. Most hiring managers can recall occasions when a gut feeling about a candidate later proved to be correct. That gut feeling however, shouldn’t be relied on in isolation. Instinct should trigger curiosity, not conclusions.

What does/ doesn’t feel right, and why?

Experienced interviewers know that instincts often signal genuine concerns. Is the concern based on something the candidate has demonstrated, or simply a reaction to their communication style or approach?

The same challenge applies when you're immediately impressed by someone. Are they demonstrating the skills the role requires, or are you responding to confidence, charisma or shared interests?

Good interviewers don't ignore their instincts. They investigate them.
That investigation starts before the interview itself.

Every recruitment process should begin with a simple question:

What evidence do we need to see to be confident this person can perform the role?
Everything else should follow from that.

The competencies required for success should be defined before the first interview takes place, and every candidate should be assessed against consistent criteria and core questions. Structure doesn't remove judgement; it helps ensure judgement is applied fairly.

Competency-based interviewing is still valuable, but only when interviewers take time to explore what the candidate actually contributed, why decisions were made, what challenges they faced, what they learned and what they would do differently next time.
Conversation alone is rarely enough.

Practical exercises, work samples, technical assessments and realistic case studies often provide stronger evidence of future performance than polished interview answers. Someone who interviews brilliantly may still struggle in the role, while a high performer may simply be less skilled at self-promotion.

Interviewers should be comfortable discovering the limits of a candidate's knowledge.
This isn't about catching people out. It's about understanding where experience genuinely ends. If every question remains comfortably within a candidate's expertise, we've measured confidence more than capability.

How someone responds when they don't know the answer can reveal just as much as the answers they do know. Do they acknowledge the gap honestly, think logically and ask sensible questions, or do they become defensive, vague or evasive?

What behaviours do you witness in that moment?

Those behaviours often mirror how people respond to challenges in the workplace.
Perhaps the most useful question we can ask ourselves after every interview is also the simplest:

Am I assessing evidence, or validating a first impression?

If the answer gives us pause, it's worth returning to the evidence.

Because good recruitment isn't about hiring the person we feel most comfortable with or the candidate who interviews most confidently. It's about identifying who can perform, grow and contribute over the long term.

Instinct still matters, but it should prompt questions rather than provide answers.

The organisations that consistently make the best hiring decisions are those disciplined enough to test intuition against objective evidence. In an age of AI-generated applications and increasingly polished candidates, that discipline has never been more important.

The best interviewers aren't those who trust their instincts without question, they're the ones who challenge those instincts and make decisions based on evidence.