From the outside, hiring can look like a fairly rational process. You define the role, review applications, interview a shortlist and choose the person who seems best suited to the job.

But recruitment decisions are made by people. And wherever people are making judgements about other people, psychology plays a part.

We form impressions quickly. We notice things that confirm what we already think. We can feel an immediate connection with someone who reminds us of ourselves, or find one strong characteristic colouring our view of everything else they say.

None of this makes someone a bad hiring manager. These are normal features of human judgement, and simply knowing that bias exists does not necessarily make us immune to it. The CIPD recommends designing recruitment processes in ways that reduce the opportunity for bias to influence decisions, rather than relying on awareness alone.

So, what might be influencing a hiring decision without us realising it? And, more importantly, what can employers do about it?

Think about the first few minutes of an interview.

One candidate arrives early, immediately builds rapport and gives a confident answer to your opening question. Another is visibly nervous, takes a little longer to settle and perhaps doesn’t make quite the same immediate impression.

It’s easy for those early perceptions to influence how we see what follows.

Once we’ve formed an initial view of someone, we don’t necessarily approach every new piece of information with a completely clean slate. Instead, our early impression can affect how we interpret later answers.

This matters because making a great impression and being great at the job aren’t necessarily the same thing.

Confidence may genuinely matter in some roles. In others, careful thinking, technical knowledge, attention to detail or the ability to build relationships over time could be far more important. The question is whether we’re assessing something that matters to the role, or simply responding to how the person made us feel in the room.

A useful safeguard is to decide what you’re looking for before meeting candidates. When the criteria are clear in advance, there’s something more concrete to assess against than the impression created during the conversation.

First impressions can also feed into another psychological tendency: confirmation bias.

Suppose you’ve reviewed a CV and already have a strong feeling that a candidate will be excellent. During the interview, they give three good answers and one fairly weak one.

There is a risk that the good answers reinforce your original impression, while the weaker answer is explained away as nerves or an unusually difficult question.

Now imagine another candidate whose CV didn’t excite you quite as much. Their weaker answer might suddenly feel much more significant.

That’s the problem with confirmation bias. Once we have an expectation, we can give greater weight to information that supports it and pay less attention to evidence that challenges it.

In recruitment, that early expectation might come from someone’s CV, previous employer, qualifications, appearance, manner or a recommendation from somebody we trust.

The answer isn’t to pretend those impressions don’t happen. It’s to create a process that brings us back to the evidence.

What did the candidate actually demonstrate? How well did their answer meet the criteria? Are we assessing each person in the same way?

Recruitment involves relationships, so it’s hardly surprising that we often warm to candidates who feel familiar.

Perhaps they have a similar career path to ours. They went to the same university. They have shared interests. Their communication style feels familiar. Conversation simply flows.

This is often discussed in terms of affinity or similarity bias: the possibility that perceived similarities can influence how positively we respond to someone.

The terminology around individual biases can sometimes make recruitment psychology sound more clear-cut than real human decision-making actually is. But the practical issue is worth considering.

Feeling comfortable with a candidate isn’t necessarily evidence that they’ll perform well.

This is particularly relevant when people talk about “culture fit”. There may be perfectly legitimate behaviours and values that matter to an organisation, but vague questions about whether someone will “fit in” can leave a lot of room for personal preference.

Instead, make the requirement specific.

If collaboration matters, what does good collaboration look like in this role? If adaptability matters, ask candidates for evidence of how they’ve responded to change. If communication is important, decide which aspects of communication the job genuinely requires.

The more specific the requirement, the easier it becomes to distinguish relevant evidence from personal chemistry.

Sometimes one characteristic becomes so noticeable that it influences our overall impression of a candidate.

That’s broadly what psychologists mean by the halo effect. A particularly positive characteristic creates a “halo” around the person, affecting how we judge other qualities.

Perhaps someone has worked for a company you admire. They give an outstanding answer to the most important interview question. Or they have exactly the industry experience you were hoping to find.

Those things may be relevant. The risk comes when one positive feature starts doing the work of several.

The opposite can happen too. Sometimes described as the horns effect, one negative impression can disproportionately affect the rest of our assessment.

Maybe a candidate doesn’t have experience in your exact sector. They stumble over an early answer. There’s an unexplained gap on their CV.

A fair assessment doesn’t mean ignoring strengths or weaknesses. It means asking how much each one should matter for this particular job.

Not every weakness is a deal-breaker. Not every strength is decisive.

A brilliant presentation shouldn’t automatically compensate for weak evidence elsewhere unless presentation ability genuinely carries that much weight in the role. Equally, one nervous answer shouldn’t outweigh strong evidence across the rest of the selection process.

If you’ve hired people for any length of time, you will probably recognise the phrase: “I just had a good feeling about them.”

Instinct can feel particularly persuasive when you’ve recruited people for years. Experience does matter, and experienced managers may recognise patterns that are difficult to put into words.

The problem comes when instinct becomes the decision rather than one input into it.

A gut feeling doesn’t necessarily tell us why one candidate is stronger than another. It can also be influenced by many of the factors we’ve already discussed: first impressions, familiarity, confidence, personal chemistry and our expectations before the interview began.

That doesn’t mean human judgement should disappear from recruitment. Far from it. It means giving that judgement something solid to work with.

The CIPD advises that selection should be based on candidates’ ability to perform the role, their contribution to the organisation and their potential for development. It also recommends clear, objective and structured selection processes to reduce the influence of bias.

So when your instinct says, “They’re the one”, it can be useful to ask a second question: what evidence from the process supports that view?

A structured interview can sound rather formal, but it doesn’t need to feel robotic.

You can still have a warm, natural conversation with a candidate. Structure simply means deciding in advance what you need to assess and creating enough consistency to compare candidates fairly.

CIPD guidance recommends developing questions and scoring criteria before interviews, asking candidates the same questions in the same order and assessing responses against objective criteria. Research shows that structured interviews can help minimise bias and enable fairer comparisons between candidates.

Acas similarly recommends preparing interview questions in advance and, where possible, asking each applicant the same questions. When deciding who gets the job, it advises checking decisions against how candidates met the job description and person specification.

That doesn’t mean every interview has to follow a script word for word. Follow-up questions can help you understand an answer properly. Candidates will have different experiences worth exploring.

The important part is that the core assessment remains consistent.

If Candidate A is given plenty of opportunities to demonstrate their leadership experience while Candidate B is barely asked about theirs, comparing them afterwards becomes much harder.

No recruitment process can remove human judgement entirely, and that shouldn’t be the goal.

Instead, employers can create a framework that helps judgement focus on evidence that actually matters.

Define the criteria before reviewing candidates. Decide what is genuinely required for the role and separate essentials from preferences. This gives everyone involved a common reference point.

Structure the interview. Prepare core questions linked to the role and use them consistently across candidates. This still leaves room for a natural conversation, but gives you a stronger basis for comparison.

Agree how answers will be assessed. A simple scoring guide can help interviewers judge evidence against the same standard rather than relying on broad impressions such as “strong candidate” or “not sure about them”.

Use more than one perspective where appropriate. Acas recommends, where possible, having more than one person conduct interviews to reduce the risk of discrimination. Different perspectives can also help challenge assumptions, provided everyone is working from the same criteria.

Keep bringing the conversation back to the role. When someone likes or dislikes a candidate, ask why. Which requirement does that observation relate to? What evidence supports it?

Build reasonable adjustments into the process. Fair assessment doesn’t always mean giving everybody an identical experience. Under the Equality Act 2010, employers have duties around reasonable adjustments for disabled applicants. Adjustments might include accessible interview arrangements, alternative formats or extra time for a selection exercise where appropriate. (Acas)

Review the evidence before making the offer. Before settling on a candidate, revisit the agreed criteria and scores. Ask whether the decision reflects the evidence gathered throughout the process or whether one interview moment, characteristic or feeling has taken on too much importance.

With employment law continually evolving, it’s important to keep recruitment processes fair, consistent and compliant.

The Equality Act 2010 protects candidates from discrimination during recruitment on the basis of protected characteristics. This applies throughout the process, from advertising and shortlisting through to interviews and decisions about who to employ.

It’s worth regularly reviewing your recruitment process to make sure it reflects current guidance and gives every candidate a fair opportunity.

It’s not about making recruitment complicated - it’s about making sure your process works fairly for everyone.

There’s another side to recruitment psychology that’s easy to overlook: the candidate is assessing you at the same time.

How organised was the process? Did the interviewers seem prepared? Were the questions relevant? Did the candidate understand what would happen next? Did they feel they had a fair opportunity to show what they could do?

CIPD guidance identifies candidate experience as an important consideration when choosing and designing selection methods, while Acas recommends telling candidates when and how they’ll hear the outcome and what feedback they can expect.

A well-structured process doesn’t have to feel impersonal. Done properly, it can do the opposite. Candidates know what is expected of them, interviewers are prepared and everyone has a clearer conversation about whether the role is right.

Recruitment is a two-way decision. The impression you create during hiring may shape whether the person you eventually choose wants to choose you too.

There is no magical way to eliminate bias from recruitment. Hiring involves people making decisions about people, so judgement will always be part of it.

The aim is to recognise where that judgement can be influenced and build a process that gives it a better framework.

Clear criteria, structured interviews, consistent questions and evidence-based assessment won’t make recruitment completely objective. They can, however, make it easier to see why you’re choosing one candidate over another and whether those reasons genuinely relate to the job.

Ultimately, the goal isn’t to take judgement out of hiring. It’s to make sure that judgement is grounded in something more meaningful than a gut feeling.

And that gives employers a better chance of making hiring decisions they can stand behind.

After reading this, do you think your recruitment process gives every candidate a fair opportunity to demonstrate what they can bring to the role?

If you’re hiring or reviewing your current process, the team at Precept Recruit is always happy to help and share our perspective.

Sometimes, a second pair of eyes is all it takes to spot where your process could be stronger.

If you’d like to chat about your recruitment approach, get in touch with the team today.