The hiring mistake that's quietly cost founders six figures

Two finalists. One feels instantly familiar — similar background, similar sense of humour, similar way of talking about the work. The other is more obviously qualified on paper, but the founder can’t quite put their finger on why the conversation felt slightly harder.

Most founders hire the first candidate. It’s called similarity bias, and it’s one of the most expensive, least examined decisions a growing business makes.

Why familiarity feels like a good signal (and usually isn’t)

Similarity reads as chemistry, and chemistry feels like evidence. But “feels like me” and “will do this job well” are different questions, and the first one is much easier for your brain to answer quickly — which is exactly why it wins so often under time pressure.

The candidate who feels different often asks harder questions, pushes back sooner, and takes longer to trust. Those are frequently the exact traits the role needs.

What it actually costs

A senior mis-hire rarely fails cleanly or quickly. More often: months of underperformance that’s hard to name, a slow exit — sometimes extended sick leave — followed by restarting the search from scratch, often for a role that’s now more urgent than it was the first time. Recruitment fees, lost productivity, management time and the eventual re-hire add up fast, and £100,000 is a realistic total for a senior role handled this way, once everything is counted.

The practical fix

You don’t need to distrust every instinct. You need a second opinion that isn’t subject to the same bias — someone assessing the role’s requirements against the candidate, not their own comfort against the candidate. If your hiring process doesn’t include a structured, independent check on senior calls specifically, that’s the gap worth closing first.

Demo content, written for this proof of concept in the Oblong editorial voice.